Bibliographies thématiques / Two dimensional visible spectroscopy

Littérature scientifique sur le sujet « Two dimensional visible spectroscopy »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Two dimensional visible spectroscopy"

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Belabas, Nadia, et Manuel Joffre. « Visible–infrared two-dimensional Fourier-transform spectroscopy ». Optics Letters 27, no 22 (15 novembre 2002) : 2043. http://dx.doi.org/10.1364/ol.27.002043.

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Mewes, Lars, Rebecca A. Ingle, Andre Al Haddad et Majed Chergui. « Broadband visible two-dimensional spectroscopy of molecular dyes ». Journal of Chemical Physics 155, no 3 (21 juillet 2021) : 034201. http://dx.doi.org/10.1063/5.0053554.

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Cassette, Elsa, Jacob C. Dean et Gregory D. Scholes. « Two-Dimensional Visible Spectroscopy For Studying Colloidal Semiconductor Nanocrystals ». Small 12, no 16 (5 février 2016) : 2234–44. http://dx.doi.org/10.1002/smll.201502733.

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Vietze, Laura, Ellen H. G. Backus, Mischa Bonn et Maksim Grechko. « Distinguishing different excitation pathways in two-dimensional terahertz-infrared-visible spectroscopy ». Journal of Chemical Physics 154, no 17 (7 mai 2021) : 174201. http://dx.doi.org/10.1063/5.0047918.

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Meisel, D. C., M. Deubel, M. Hermatschweiler, K. Busch, W. Koch, G. von Freymann, A. Blanco, C. Enkrich et M. Wegener. « Three-Dimensional Photonic Crystals ». Solid State Phenomena 99-100 (juillet 2004) : 55–64. http://dx.doi.org/10.4028/www.scientific.net/ssp.99-100.55.

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We review our work on two complementary and compatible techniques, namely direct laser writing and holographic lithography which are suitable for fabricating three-dimensional Photonic Crystal templates for the visible and near-infrared. The structures are characterized by electron micrographs and by optical spectroscopy, revealing their high optical quality.
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Silfies, Myles C., Yuning Chen, Henry Timmers, Abijith S. Kowligy, Alex Lind, Scott A. Diddams et Thomas K. Allison. « Widely tunable cavity-enhanced ultrafast spectroscopy ». EPJ Web of Conferences 205 (2019) : 01024. http://dx.doi.org/10.1051/epjconf/201920501024.

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Generation of widely tunable frequency combs in the UV, visible, and infrared is discussed for use in cavity-enhanced transient absorption spectroscopy on gas-phase clusters. Progress towards cavity-enhanced two-dimensional spectroscopy is also presented.
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Li, Zi-Long, et Yuan Wan. « A theoretical survey of two-dimensional coherent spectroscopy in strongly-correlated electronic systems ». Acta Physica Sinica 70, no 23 (2021) : 230308. http://dx.doi.org/10.7498/aps.70.20211556.

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Two-dimensional coherent spectroscopy (2DCS) diagnoses a material’s nonlinear optical response with multiple time variables, thus offering information that is inaccessible with conventional linear optical spectroscopy. The 2DCS in the infrared, visible, and ultraviolet frequency range has yielded fruitful results in chemistry and biology. In the terahertz (THz) frequency window, 2DCS has shown its promise in the study of strongly-correlated electronic systems. As a guide to this rapidly developing field, we survey the current status of the theory of THz-2DCS in strongly-correlated electronic systems. We then introduce the basic concepts and theoretical methods of 2DCS, and analyze the main characteristics of the two-dimensional spectra. Finally, we summarize our latest theoretical research in this field.
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Guo, Xunmin, Hailong Chen, Xiewen Wen et Junrong Zheng. « Electron-phonon interactions in MoS2 probed with ultrafast two-dimensional visible/far-infrared spectroscopy ». Journal of Chemical Physics 142, no 21 (7 juin 2015) : 212447. http://dx.doi.org/10.1063/1.4921573.

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Liu, Yongliang, Yud-Ren Chen et Yukihiro Ozaki. « Two-Dimensional Visible/Near-Infrared Correlation Spectroscopy Study of Thermal Treatment of Chicken Meats ». Journal of Agricultural and Food Chemistry 48, no 3 (mars 2000) : 901–8. http://dx.doi.org/10.1021/jf990662b.

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Zhang, Zhengyong, Min Sha, Yuehu Wang et Haiyan Wang. « Chemical Perturbation Two-Dimensional Correlation Ultraviolet Visible Spectroscopy for Quality Control of Chinese Liquor ». Journal of the American Society of Brewing Chemists 76, no 2 (23 février 2018) : 141–46. http://dx.doi.org/10.1080/03610470.2017.1406257.

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Thèses sur le sujet "Two dimensional visible spectroscopy"

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Townsley, Christopher Mark. « Optical spectroscopy of two-dimensional hole systems in the quantum limit ». Thesis, University of Exeter, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312067.

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Harris, Janet Caroline. « Optical spectroscopy of correlated two-dimensional electrons ». Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390497.

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Zhang, Xu Ph D. Massachusetts Institute of Technology. « Two-dimensional crystals : spectroscopy and electronic applications ». Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112036.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 159-177).
The success in creating atomically thin and mechanically robust two-dimensional (2D) crystals, starting with graphene, has unveiled new possibilities for next generation of ultrafast and ubiquitous electronics. One critical distinction between 2D crystals and 3D crystals is that 2D crystals are all-surface materials. Therefore, it is essential to understand how 2D materials interact with their environments and how this interaction impacts their electronic properties. From a practical perspective, it also provides us with a unique tool to tailor the electronic properties of 2D materials through surface functionalization. In the first half of this thesis, a suite of X-ray techniques is used to investigate how the surface functionalizing dopants will impact the electronic and chemical states of graphene. Based on this study, we develop an effective and non-invasive doping method for graphene through plasma-based chlorination. In order to make system-level 2D electronics successful, a flexible and ubiquitous energy harvesting solution is indispensable. Therefore, the second part of this thesis is dedicated to the development of a MoS₂ 2H-1T phase heterojunction-based GHz flexible rectifier as an enabling component for wireless energy harvester. It is the first flexible rectifier operating up to the X-band and it covers most of the unlicensed industrial, scientific and medical (ISM) radio band, including the Wi-Fi channels. By integrating this rectifier with an antenna, the MoS₂-enabled rectenna successfully demonstrates direct energy harvesting of electromagnetic (EM) radiation in the Wi-Fi band and lights up a commercial light-emitting diode (LED) with zero external bias (battery-free). Moreover, our MoS₂ rectifier also realizes successful frequency conversion as a mixer beyond 10 GHz on flexible substrates. This work provides a universal energy harvesting building block that can be integrated with various wearable electronic systems and paves the way towards using the existing Wi-Fi infrastructure as an energy hotspot for wireless charging.
by Xu Zhang.
Ph. D.
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Kraft, Robert A. (Robert Arthur) 1970. « In vivo two-dimensional NMR correlation spectroscopy ». Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/85271.

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Gardner, Elizabeth Mary. « Two-dimensional infrared spectroscopy for protein analysis ». Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/5602.

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A number of forms of coherent multi-dimensional vibrational spectroscopy (CMDVS) have been identified as being useful for addressing a range of biological problems. Here a particular member of this family of spectroscopies, electronvibration- vibration two-dimensional infrared (EVV 2DIR) spectroscopy (also known as DOubly-Vibrationally Enhanced InfraRed (DOVE-IR)), is explored for its possible utility for two particular bioanalytical applications; protein identification and the study of enzyme mechanisms. The main focus of this work is on the development of EVV 2DIR as a tool for high-throughput, label-free proteomics, in particular for protein identification and absolute quantification. The protein fingerprinting strategy is based on the identification of proteins through their spectroscopically determined amino acid compositions. To this end, spectral signatures of amino acid side chains (tyrosine, phenylalanine and tryptophan) have been identified, as well as those from CH2 and CH3 groups which have been found to be appropriate for use as internal references. The intensities of these cross peaks are measured to give proteins’ amino acid compositions in the form of amino acid / CHx ratios. Specialised databases comprising the amino acid / CHx ratios of proteins have been developed for achieving protein identifications using the EVV 2DIR data. The second strand of this research considers the potential of triply resonant EVV 2DIR for studying protein structures and mechanisms. It is possible to use the electronic polarising properties of EVV 2DIR to good effect to achieve significant enhancement of the signal size when probing a chromophore. Here this effect is demonstrated for the case of bacteriorhodopsin (bR) membranes isolated from Halobacterium salinarium. The signal enhancement that is achievable from the retinal chromophore at the heart of bR makes it possible to study this whilst avoiding the surrounding protein.
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Paul, Jagannath. « Coherent Response of Two Dimensional Electron Gas probed by Two Dimensional Fourier Transform Spectroscopy ». Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6738.

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Advent of ultrashort lasers made it possible to probe various scattering phenomena in materials that occur in a time scale on the order of few femtoseconds to several tens of picoseconds. Nonlinear optical spectroscopy techniques, such as pump-probe, transient four wave mixing (TFWM), etc., are very common to study the carrier dynamics in various material systems. In time domain, the transient FWM uses several ultrashort pulses separated by time delays to obtain the information of dephasing and population relaxation times, which are very important parameters that govern the carrier dynamics of materials. A recently developed multidimensional nonlinear optical spectroscopy is an enhanced version of TFWM which keeps track of two time delays simultaneously and correlate them in the frequency domain with the aid of Fourier transform in a two dimensional map. Using this technique, the nonlinear complex signal field is characterized both in amplitude and phase. Furthermore, this technique allows us to identify the coupling between resonances which are rather difficult to interpret from time domain measurements. This work focuses on the study of the coherent response of a two dimensional electron gas formed in a modulation doped GaAs/AlGaAs quantum well both at zero and at high magnetic fields. In modulation doped quantum wells, the excitons are formed as a result of the inter- actions of the charged holes with the electrons at the Fermi edge in the conduction band, leading to the formation of Mahan excitons, which is also referred to as Fermi edge singularity (FES). Polarization and temperature dependent rephasing 2DFT spectra in combination with TI-FWM measurements, provides insight into the dephasing mechanism of the heavy hole (HH) Mahan exciton. In addition to that strong quantum coherence between the HH and LH Mahan excitons is observed, which is rather surprising at this high doping concentration. The binding energy of Mahan excitons is expected to be greatly reduced and any quantum coherence be destroyed as a result of the screening and electron-electron interactions. Such correlations are revealed by the dominating cross-diagonal peaks in both one-quantum and two-quantum 2DFT spectra. Theoretical simulations based on the optical Bloch Equations (OBE) where many-body effects are included phenomenologically, corroborate the experimental results. Time-dependent density functional theory (TD-DFT) calculations provide insight into the underlying physics and attribute the observed strong quantum coherence to a significantly reduced screening length and collective excitations of the many-electron system. Furthermore, in semiconductors under the application of magnetic field, the energy states in conduction and valence bands become quantized and Landau levels are formed. We observe optical excitation originating from different Landau levels in the absorption spectra in an undoped and a modulation doped quantum wells. 2DFT measurements in magnetic field up to 25 Tesla have been performed and the spectra reveal distinct difference in the line shapes in the two samples. In addition, strong coherent coupling between landau levels is observed in the undoped sample. In order to gain deeper understanding of the observations, the experimental results are further supported with TD-DFT calculation.
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Johnson, Mark Thomas. « Photoelectron spectroscopy of two-dimensional materials and surfaces ». Thesis, University of Cambridge, 1987. https://www.repository.cam.ac.uk/handle/1810/250898.

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Mignuzzi, Sandro. « Near-field optical spectroscopy of two-dimensional materials ». Thesis, King's College London (University of London), 2017. https://kclpure.kcl.ac.uk/portal/en/theses/nearfield-optical-spectroscopy-of-twodimensional-materials(2e5e7a6b-d2b5-4242-bab7-3a66bd6c8c25).html.

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Real materials contain structural defects which significantly affect their properties. Defects, in a general sense, are ubiquitous and encompass the diverse variety of elements capable of disrupting the continuity and translational symmetry of a crystalline lattice, both in terms of its structural morphology, and in terms of local modulation of its electrical and optical properties. In this perspective, atomic vacancies, line vacancies, atomic rearrangements, local doping inhomogeneity, chemically adsorbed adatoms, all fall within the broad category of defects. Thus, the nanoscale details of surface structure plays a pivotal role in understanding the impact defects may have on the overall properties of the material, and this is particularly true for "all-surface" materials such as two-dimensional (2-D) crystals. Even the interface between two atomically thin layers has a strong impact on the electronic and optical properties of few-layered stacks; therefore, also the interface associated with stacking and layer orientation can be viewed as an extend defect in two dimensions. While macroscopic morphological characterization methods can provide averaged information over a lateral extent defined by their spatial resolution, high resolution (i.e. nanoscale) imaging has the potential to unveil important insights into the role of defects that dominate several aspects of surface chemistry and physics. On the one hand, defects in 2-D materials can be seen as deleterious as they may alter their electrical, chemical, magnetic and mechanical properties. On the other hand, the intentional creation of nanoscale defects may offer an additional degree of freedom for engineering their properties. In this perspective, having structural defects can be either detrimental or beneficial, depending on the targeted application. Despite the ever expanding literature on the study of the interplay between defects and the optical, electrical and mechanical properties of two dimensional materials, direct and non-destructive imaging of defect formation at the nanoscale remains a significant challenge. Although techniques such as electron microscopies or scanning tunnelling microscopy can be used to resolve individual lattice defects, they may be destructive or restricted to specific (e.g. conductive) substrates. This thesis presents a nanoscale optical investigation of 2-D materials, such as graphene and single-layer MoS2, with a particular focus on the characterisation of defects. The field enhancement at the tip-apex of a metal-coated atomic force microscopy (AFM) tip is used to decrease the spatial resolution beyond the diffraction limit. In the case of the investigation of Raman scattering, this near-field optical technique is known as tip-enhanced Raman spectroscopy (TERS). TERS is here demonstrated to be a valid technique to probe the distribution of point-like defects at the nanoscale, especially in the case of barely defective graphene. An analytical model to describe near-field imaging of pointlike Raman scatterers, which is of general applicability to zero-dimensional scatterers such as molecules, is presented. The near-field image, constructed from the Raman intensity, is found to depend on the Raman tensor and the orientation of the scatterer. The model can be also used to explain the different values of near-field Raman enhancement observed for different Raman bands. Motivated by the successful optical characterization of defects in graphene by means of Raman spectroscopy, it is now timely to expand the study of structural defects to other 2-D materials, such as semiconducting transition metal dichalcogenides. MoS2 is one of the most prominent members of this newly discovered category of chalcogenide monolayers. Defect-induced Raman scattering of single-layer MoS2 is studied by means of a controlled introduction of defects using ion-bombardment. Phonon confinement is used to explain the evolution of peak widths and shifts, and a metric based on Raman intensities is proposed to quantify defects. To gain insight into the defect-induced Raman processes, polarised and resonance Raman spectroscopy are employed.
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Chan, Ho Bun 1969. « Tunneling spectroscopy of the two-dimensional electron gas ». Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9387.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
Includes bibliographical references (p. 155-161).
We measure the single particle density of states (DOS) of a two-dimensional electron system (2DES) in a GaAs/AlGaAs heterostructure. Using a technique that we call "Time Domain Capacitance Spectroscopy" (TDCS), we measure the complete current-voltage characteristics for tunneling into the 2DES without making ohmic contacts to it. TDCS detects the tunneling current in regimes difficult to access by conventional methods, such as when the in-plane conductance is low. For the first time we detect the contributions of localized states to the tunneling current. The DOS of an interacting 2DES in the diffusive limit displays logarithmic energy dependence near the Fermi level. Using TDCS, we measure the voltage dependence of the tunneling conductance of a semiconductor 2DES and observe the logarithmic Coulomb anomaly for the first time in 2D systems other than thin metal films. As we increase the density, this suppression in tunneling conductance narrows and recedes. Nevertheless suppression reappears when we apply a magnetic field perpendicular to the 2D plane. We find that the tunneling conductance depends linearly on voltage near zero bias for all magnetic field strengths and electron densities. Moreover, the slopes of this linear gap are strongly field dependent. The data are suggestive of a new model of the tunneling gap in the presence of disorder and screening. We also use TDCS to study the interactions among electronic spins. By applying excitations less than kT, we observe that equilibrium tunneling into spin-polarized quantum Hall states (v=l, 3, 1/3) occurs at two distinct tunneling rates for samples of very high mobility. Some electrons tunnel into the 2DES at a fast rate while the rest tunnel at a rate up to 2 orders of magnitude slower. Such novel double-rate tunneling is not observed at even-integer filling fractions where the 2DES is not spin-polarized. The dependence of the two rates on magnetic field, temperature and tunnel barrier thickness suggests that slow in-plane spin relaxation, possibly related to formation of Skyrmions, leads to a bottleneck for tunneling of electrons.
by Ho Bun Chan.
Ph.D.
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Zhang, Tianhao. « Optical two-dimensional Fourier transform spectroscopy of semiconductors ». Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3315815.

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Livres sur le sujet "Two dimensional visible spectroscopy"

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1938-, Bellama Jon M., dir. Two-dimensional NMR spectroscopy. New York : Wiley, 1988.

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Two-dimensional optical spectroscopy. Boca Raton : Taylor & Francis, 2009.

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One and two dimensional NMR spectroscopy. Amsterdam : Elsevier, 1989.

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Tan, Ping-Heng, dir. Raman Spectroscopy of Two-Dimensional Materials. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-1828-3.

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Friebolin, Horst. Basic one- and two-dimensional NMR spectroscopy. 2e éd. Weinheim, Germany : VCH Verlagsgesellschaft, 1993.

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Friebolin, Horst. Basic one- and two-dimensional NMR spectroscopy. 2e éd. Weinheim : VCH, 1991.

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Basic one- and two-dimensional NMR spectroscopy. 5e éd. Weinheim : WILEY-VCH, 2011.

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Basic one- and two-dimensional NMR spectroscopy. 3e éd. Weinheim : WILEY-VCH, 1998.

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Noda, Isao, et Yukihiro Ozaki. Two-Dimensional Correlation Spectroscopy - Applications in Vibrational and Optical Spectroscopy. Chichester, UK : John Wiley & Sons, Ltd, 2004. http://dx.doi.org/10.1002/0470012404.

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1925-, Nakanishi Kōji, dir. One-dimensional and two-dimensional NMR spectra by modern pulse techniques. Tokyo : Kodansha, 1990.

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Chapitres de livres sur le sujet "Two dimensional visible spectroscopy"

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Belabas, Nadia, et Manuel Joffre. « Two-dimensional visible-infrared Fourier transform spectroscopy ». Dans Ultrafast Phenomena XIII, 580–82. Berlin, Heidelberg : Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-59319-2_180.

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Vietze, Laura, Mischa Bonn et Maksim Grechko. « Two-Dimensional Terahertz-Infrared-Visible Spectroscopy Elucidates Coupling Between Low- and High-Frequency Modes ». Dans Springer Series in Optical Sciences, 197–214. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9753-0_9.

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Czarnecki, Mirosław A., et Shigeaki Morita. « Two-Dimensional Correlation Spectroscopy ». Dans Near-Infrared Spectroscopy, 111–26. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8648-4_6.

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Hatada, Koichi, et Tatsuki Kitayama. « Two-dimensional NMR Spectroscopy ». Dans NMR Spectroscopy of Polymers, 143–68. Berlin, Heidelberg : Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-08982-8_6.

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Bax, Ad. « Two-Dimensional NMR Spectroscopy ». Dans NMR in Living Systems, 67–94. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4580-7_5.

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Fleming, Graham R., Nicholas H. C. Lewis, E. A. Arsenault, Eric C. Wu et Sabine Oldemeyer. « Two-Dimensional Electronic Vibrational Spectroscopy ». Dans Springer Series in Optical Sciences, 35–49. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9753-0_2.

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Chizhik, Vladimir I., Yuri S. Chernyshev, Alexey V. Donets, Vyacheslav V. Frolov, Andrei V. Komolkin et Marina G. Shelyapina. « Two-Dimensional NMR Fourier Spectroscopy ». Dans Magnetic Resonance and Its Applications, 657–73. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05299-1_16.

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Baer, Stephan, et Klaus Ensslin. « Two-Dimensional Electron Gases ». Dans Transport Spectroscopy of Confined Fractional Quantum Hall Systems, 9–20. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21051-3_2.

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Kitney, Katherine A., Michael K. Yetzbacher, Alison A. Ferro et David M. Jonas. « Dispersion Relations in Two-Dimensional Spectroscopy ». Dans Ultrafast Phenomena XV, 395–97. Berlin, Heidelberg : Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68781-8_128.

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Lu, Jian, Xian Li, Yaqing Zhang, Harold Y. Hwang, Benjamin K. Ofori-Okai et Keith A. Nelson. « Two-Dimensional Spectroscopy at Terahertz Frequencies ». Dans Topics in Current Chemistry Collections, 275–320. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-02478-9_7.

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Actes de conférences sur le sujet "Two dimensional visible spectroscopy"

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Belabas, Nadia, et Manuel Joffre. « Two-dimensional visible-infrared Fourier transform spectroscopy ». Dans International Conference on Ultrafast Phenomena. Washington, D.C. : OSA, 2002. http://dx.doi.org/10.1364/up.2002.tua5.

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Nguyen, Hoang H., Yin Song, Elizabeth L. Maret, Yogita Silori et Jennifer P. Ogilvie. « Multispectral Two-Dimensional Electronic Spectroscopy of the Photosystem II Reaction Center ». Dans International Conference on Ultrafast Phenomena. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/up.2022.m1a.2.

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We present two-dimensional electronic spectroscopy of the photosystem II reaction center at 77K, exciting the spectrally-congested Qy region and probing multiple spectral regions spanning the visible to the mid-IR to extract broadband charge separation signatures.
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Sechrist, Riley, Rhiannon Willow, Yogita Silori, Arkaprabha Konar et Jennifer P. Ogilvie. « Multiexcitation Global Analysis of Two-dimensional Electronic Spectroscopy of the Bacterial Reaction Center ». Dans International Conference on Ultrafast Phenomena. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/up.2022.m4a.5.

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We report two-dimensional electronic spectroscopy (2DES) experiments on the bacterial reaction center from purple bacteria mutant W(M250)V, exciting the Qy region and probing multiple spectral regions spanning the visible–mid-IR to extract broadband signatures of charge separation.
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Chou, Keng C. « Polarization-rotation and Two-dimensional IR-visible Sum Frequency Generation Spectroscopy for Surface Analysis ». Dans Laser Science. Washington, D.C. : OSA, 2009. http://dx.doi.org/10.1364/ls.2009.lswe3.

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Milota, F., T. Mančal, V. Lukeš, A. Nemeth, J. Sperling, H. F. Kauffmann et J. Hauer. « Visible Two-Dimensional Spectroscopy with sub-7 fs Pulses Uncovers Ultrafast Electron-Phonon Coupling Dynamics ». Dans International Conference on Ultrafast Phenomena. Washington, D.C. : OSA, 2010. http://dx.doi.org/10.1364/up.2010.wb3.

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Li, Qifeng, et Keng C. Chou. « Two-dimensional IR-visible sum frequency generation spectroscopy : a unique probe of surface electronic states at buried interfaces ». Dans SPIE NanoScience + Engineering, sous la direction de Oliver L. A. Monti et Oleg V. Prezhdo. SPIE, 2009. http://dx.doi.org/10.1117/12.825666.

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Xiang, Bin, Lei Yang, Jian Huang et Qi Fu. « Two-Dimensional Monolayer MX2 (M=Mo, W ; X=S, Se) Synthesis, Characterization and Device Applications ». Dans ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48286.

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Recently two-dimensional layered semiconductors with promising electronic and optical properties, have opened up a new way for applications in atomically thin electronics and optoelectronics. Here we demonstrate large area synthesis of monolayer MoS2 and WSe2 using a chemical vapor deposition method at ambient pressure. The atomic analysis of the as-grown monolayer was conducted by spherical-aberration-corrected high resolution scanning transmission electron microscopy and atomic force microscopy. Raman spectroscopy was utilized to identify the monolayer configuration of the as-grown samples. Strong photoluminescence peaks at a visible wavelength were observed at room temperature in the as-grown monolayer samples. The mobility and carrier concentrations were calculated in as-grown monolayer-based transistor devices. The emergency of these two dimensional materials provides grand possibilities for future semiconductor device applications.
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Ishimaru, Ichiro, Hanyue Kang, Natsumi Kawashima, Tomoya Kitazaki, Jyunya Iwaki, Satoru Adachi, Sora Mizutani et Kotone Yokoyama. « Palm-sized and tough two-dimensional spectroscopic imager : the so-called hyperspectral camera for visible and mid-infrared light (first report) : trial applications of the proposed two-dimensional Fourier spectroscopic imager ». Dans Optics for Arts, Architecture, and Archaeology VII, sous la direction de Piotr Targowski, Roger Groves et Haida Liang. SPIE, 2019. http://dx.doi.org/10.1117/12.2525654.

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Itoh, Kazuyoshi, Takashi Inoue et Yoshiki Ichioka. « Interferometric Spectral Imaging in the Visible and Near-Infrared Regions ». Dans Space Optics for Astrophysics and Earth and Planetary Remote Sensing. Washington, D.C. : Optica Publishing Group, 1988. http://dx.doi.org/10.1364/soa.1988.wb6.

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We present experimental results of an interferometric method called the Fourier transform spectral imaging[1], The method is based on the alterations[2] of coherence function during propagation in free space. We assume that an incoherent light source (object) illuminates an observing site and that the optical wave field around this site consists of an ensemble of plane waves with uncorrelated amplitudes. This is a reasonable assumption when the observation volume is small or an appropriate transform lens is placed between the object and observation area. The theory predicts that three-dimensional (3-D) Fourier transformation of the 3-D spatial coherence function of the optical wave field gives the 3-D energy density function, a function of a 3-D spatial frequency or a wave vector, associated with the object[1]. Under the assumption stated above, the wave vectors assign particular directions of propagation and wavelengths of the plane waves that emanate from the particular positions in the object. Thus, the density function fully specifies the spectral image information of the object, i.e. the spatial distribution of radiation and the spectral contents comprising the radiation. Since the present method is an extension of Fourier spectroscopy to imaging spectroscopy[1], it inherits the desirable properties of the multiplex and throughput advantages.
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Rothberg, Lewis. « Picosecond infrared measurements in condensed matter ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.fm2.

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Difference frequency mixing of amplified femtosecond visible pulses with white light continuum radiation produces relatively broadband infrared pulses (~10 meV), whose bandwidth is determined by the phase matching bandwidth of the difference frequency crystal. This radiation is easily tuned over a broad range (hundreds of meV) by angle tuning of the crystal. One application is the study of photogenerated charge carriers in the quasi-one-dimensional organic semiconductor trans-polyacetylene. Beause of the strong electron-phonon coupling, electrons and holes are dressed by the lattice leading subgap levels (0.45eV). Using transient mid-infra-red spectroscopy, we can observe the subpicosecond lattice deformation as well as measure gemmate recombination dynamics and interchain excitation probabilities. These data have been used to understand the photoconductivity and nonlinear optical properties of polyacetylene. Up-conversion gating of long tunable narrowband infrared pulses by an amplified subpicosecond laser is particularly valuable for subpicosecond vibrational spectroscopy. For example, the behavior of the CO ligands can be tracked during organometallic photochemistry to provide information about their cooling, rebinding, and reorientation. Issues such as the solvation of catalytically active metal carbonyls in solution and the pathway by which CO enters and exits hemoglobin are addressed.
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Rapports d'organisations sur le sujet "Two dimensional visible spectroscopy"

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McIlroy, David. Two-Dimensional Photonic Crystals for Near IR and Visible Optoelectronics Applications. Fort Belvoir, VA : Defense Technical Information Center, janvier 2005. http://dx.doi.org/10.21236/ada430192.

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Brett, Jack Kevin. Literature Review of Generalized Two-Dimensional Correlation Spectroscopy (2D-COS). Office of Scientific and Technical Information (OSTI), mars 2019. http://dx.doi.org/10.2172/1504629.

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Cundiff, Steven T. Optical Two-Dimensional Spectroscopy of Disordered Semiconductor Quantum Wells and Quantum Dots. Office of Scientific and Technical Information (OSTI), mai 2016. http://dx.doi.org/10.2172/1250541.

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Cahoon, James Francis. Investigation of organometallic reaction mechanisms with one and two dimensional vibrational spectroscopy. Office of Scientific and Technical Information (OSTI), décembre 2008. http://dx.doi.org/10.2172/1001071.

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Cundiff, Steven. Final Report for Optical Two-Dimensional Spectroscopy of Semiconductor Quantum Wells and Quantum Dots. Office of Scientific and Technical Information (OSTI), décembre 2019. http://dx.doi.org/10.2172/1577852.

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Thielges, Megan. Mechanisms underlying plastocyanin-cytochrome f electron transfer investigated via site-specific linear and two-dimensional infrared spectroscopy. Office of Scientific and Technical Information (OSTI), juillet 2022. http://dx.doi.org/10.2172/1878605.

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Henderson, Terry J. Nuclear Magnetic Resonance Identification of Military Nerve Agents and Related Compounds by Two-Dimensional 31P-1H Heteronuclear Overhauser Effect Spectroscopy. Fort Belvoir, VA : Defense Technical Information Center, juin 2010. http://dx.doi.org/10.21236/ada524492.

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Henderson, Terry J., et David B. Cullinan. Trace Level Detection of Chemical Weapons Convention Compounds by Two-Dimensional C13-NMR Spectroscopy using a Cryogenic Probehead and H1-Detection Techniques. Fort Belvoir, VA : Defense Technical Information Center, octobre 2009. http://dx.doi.org/10.21236/ada507477.

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Manulis, Shulamit, Christine D. Smart, Isaac Barash, Guido Sessa et Harvey C. Hoch. Molecular Interactions of Clavibacter michiganensis subsp. michiganensis with Tomato. United States Department of Agriculture, janvier 2011. http://dx.doi.org/10.32747/2011.7697113.bard.

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Clavibacter michiganensis subsp. michiganensis (Cmm), the causal agent of bacterial wilt and canker of tomato, is the most destructive bacterial disease of tomato causing substantial economic losses in Israel, the U.S.A. and worldwide. The molecular strategies that allow Cmm, a Gram-positive bacterium, to develop a successful infection in tomato plants are largely unknown. The goal of the project was to elucidate the molecular interactions between Cmmand tomato. The first objective was to analyze gene expression profiles of susceptible tomato plants infected with pathogenic and endophytic Cmmstrains. Microarray analysis identified 122 genes that were differentially expressed during early stages of infection. Cmm activated typical basal defense responses in the host including induction of defense-related genes, production of scavenging of free oxygen radicals, enhanced protein turnover and hormone synthesis. Proteomic investigation of the Cmm-tomato interaction was performed with Multi-Dimensional Protein Identification Technology (MudPIT) and mass spectroscopy. A wide range of enzymes secreted by Cmm382, including cell-wall degrading enzymes and a large group of serine proteases from different families were identified in the xylem sap of infected tomato. Based on proteomic results, the expression pattern of selected bacterial virulence genes and plant defense genes were examined by qRT-PCR. Expression of the plasmid-borne cellulase (celA), serine protease (pat-1) and serine proteases residing on the chp/tomA pathogenicity island (chpCandppaA), were significantly induced within 96 hr after inoculation. Transcription of chromosomal genes involved in cell wall degradation (i.e., pelA1, celB, xysA and xysB) was also induced in early infection stages. The second objective was to identify by VIGS technology host genes affecting Cmm multiplication and appearance of disease symptoms in plant. VIGS screening showed that out of 160 tomato genes, which could be involved in defense-related signaling, suppression of 14 genes led to increase host susceptibility. Noteworthy are the genes Snakin-2 (inhibitor of Cmm growth) and extensin-like protein (ELP) involved in cell wall fortification. To further test the significance of Snakin -2 and ELP in resistance towards Cmm, transgenic tomato plants over-expressing the two genes were generated. These plants showed partial resistance to Cmm resulting in a significant delay of the wilt symptoms and reduction in size of canker lesion compared to control. Furthermore, colonization of the transgenic plants was significantly lower. The third objective was to assess the involvement of ethylene (ET), jasmonate (JA) and salicylic acid (SA) in Cmm infection. Microarray and proteomic studies showed the induction of enzymes involved in ET and JA biosynthesis. Cmm promoted ET production 8 days after inoculation and SIACO, a key enzyme of ET biosynthesis, was upregulated. Inoculation of the tomato mutants Never ripe (Nr) impaired in ET perception and transgenic plants with reduced ET synthesis significantly delayed wilt symptoms as compared to the wild-type plants. The retarded wilting in Nr plants was shown to be a specific effect of ET insensitivity and was not due to altered expression of defense related genes, reduced bacterial population or decrease in ethylene biosynthesis . In contrast, infection of various tomato mutants impaired in JA biosynthesis (e.g., def1, acx1) and JA insensitive mutant (jai1) yielded unequivocal results. The fourth objective was to determine the role of cell wall degrading enzymes produced by Cmm in xylem colonization and symptoms development. A significance increase (2 to 7 fold) in expression of cellulases (CelA, CelB), pectate lyases (PelA1, PelA2), polygalacturonase and xylanases (XylA, XylB) was detected by qRT-PCR and by proteomic analysis of the xylem sap. However, with the exception of CelA, whose inactivation led to reduced wilt symptoms, inactivation of any of the other cell wall degrading enzymes did not lead to reduced virulence. Results achieved emphasized the complexity involved in Cmm-tomato interactions. Nevertheless they provide the basis for additional research which will unravel the mechanism of Cmm pathogenicity and formulating disease control measures.
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