Статті в журналах: "Resonant Raman Effect"

1

Wurth, W. "Resonant Auger Raman effect for adsorbates." Applied Physics A: Materials Science & Processing 65, no. 2 (August 1, 1997): 155–58. http://dx.doi.org/10.1007/s003390050558.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Iwazumi, T., K. Kobayashi, S. Kishimoto, T. Nakamura, S. Nanao, D. Ohsawa, R. Katano, and Y. Isozumi. "Magnetic resonance effect in x-ray resonant Raman scattering." Physical Review B 56, no. 22 (December 1, 1997): R14267—R14270. http://dx.doi.org/10.1103/physrevb.56.r14267.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Zhong, Qing-Hu, Yu Wu, Yun-Chang Xiao, Liang-Bin Hu, and Rui-Qiang Wang. "The influence of size effect on interface phonons in core-shell quantum dot: a resonant Raman study." Modern Physics Letters B 28, no. 21 (August 20, 2014): 1450172. http://dx.doi.org/10.1142/s0217984914501723.

Повний текст джерела

Анотація:

In this paper, the interface phonons in a core-shell quantum dot are theoretically studied by a resonant Raman scattering (RRS) process. Fröhlich electron–phonon interaction is considered in the framework of the dielectric continuum approach. The Raman peaks are found to be sensitive to the size of strongly confined shell. The shift of the Raman resonant peaks is a consequence of the change of observed dispersion of the phonon frequency. The Raman intensity changes in the system with shell thickness, originating from the competition between the spacial distribution of electron wave function and the number of phonons joining in the RRS process. The analysis of the Raman spectra gives a physical explanation to the size-selective nature of the Raman process and some experimental results.

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Medel-Ruiz, C. I., H. Pérez Ladrón de Guevara, J. R. Molina-Contreras, and C. Frausto-Reyes. "Fano effect in resonant Raman spectrum of CdTe." Solid State Communications 312 (May 2020): 113895. http://dx.doi.org/10.1016/j.ssc.2020.113895.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Gołasa, Katarzyna, Magdalena Grzeszczyk, Maciej R. Molas, Małgorzata Zinkiewicz, Karol Nogajewski, Marek Potemski, Andrzej Wysmołek, and Adam Babiński. "Anomalous Raman Scattering In Few Monolayer MoTe2." MRS Advances 2, no. 29 (2017): 1539–44. http://dx.doi.org/10.1557/adv.2017.39.

Повний текст джерела

Анотація:

ABSTRACTThe effect of temperature (5K to 300K) on the Raman scattering due to A1g/A1’ modes associated with the out-of-plane vibrations in bilayer (2L) and trilayer (3L) MoTe2 is investigated. The temperature evolution of the modes critically depends on the flake thickness. The A1g mode intensity in 2L MoTe2 observed with λ=632.8 nm light excitation decreases with decreasing temperature down to 220K and the mode vanishes from the Stokes scattering spectrum in the temperature range between 160K and 220K. The peak recovers at lower temperatures and at T=5K it becomes three times more intense that at room temperature. Similar non-monotonic intensity evolution is observed for the A1’ mode in 3L MoTe2 in which tellurium atoms in all three layers vibrate in-phase. On the contrary, the intensity of the other out-of-plane Raman-active mode in which vibrations of tellurium atoms in the central layer of 3L MoTe2 are shifted by 180° with respect to vibrations in outer layers, only weakly depends on temperature.The observed quenching of the out-of-plane modes in the Raman scattering in thin MoTe2 layers is related to the destructive interference of the resonant- and the non-resonant contributions to the Raman scattering. The resonance with the M point of the Brillouin zone in few-layers of MoTe2 is considered. Effects related to the resonant quenching of the in-phase out-of-plane mode are discussed.

Стилі APA, Harvard, Vancouver, ISO та ін.

6

LEE, HYUN C. "RESONANT RAMAN SCATTERING OF QUANTUM WIRE IN STRONG MAGNETIC FIELD." International Journal of Modern Physics B 13, no. 17 (July 10, 1999): 2275–83. http://dx.doi.org/10.1142/s0217979299002381.

Повний текст джерела

Анотація:

The resonant Raman scattering of a quantum wire in a strong magnetic field is studied, focused on the effect of long range Coulomb interaction and the spin–charge separation. The energy–momentum dispersions of charge and spin excitation obtained from Raman cross-section show the characteristc cross-over behaviour induced by inter-edge Coulomb interaction. The "SPE" peak near resonance in polarized spectra becomes broad due to the momentum dependence of charge velocity. The broad peak in the depolarized spectra is shown to originate from the disparity between charge and spin excitation velocity.

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Kobayashi, Naoki, Takeshi Toriyama, and Yoshiji Horikoshi. "Resonant Raman effect in thin‐layered AlAs‐GaAs superlattices." Applied Physics Letters 50, no. 25 (June 22, 1987): 1811–13. http://dx.doi.org/10.1063/1.97705.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Drube, W., and R. Treusch. "Photoemission study of the radiationless X-ray resonant Raman effect." Physica B: Condensed Matter 208-209 (March 1995): 33–34. http://dx.doi.org/10.1016/0921-4526(94)00626-7.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Kukk, E., S. Aksela, and H. Aksela. "Features of the Auger resonant Raman effect in experimental spectra." Physical Review A 53, no. 5 (May 1, 1996): 3271–77. http://dx.doi.org/10.1103/physreva.53.3271.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Ziemath, E. C., M. A. Aegerter, F. E. A. Melo, J. E. Moreira, J. Mendes Filho, M. S. S. Dantas, and M. A. Pimenta. "Pre-resonant Raman effect of CrO42− in a metasilicate glass." Journal of Non-Crystalline Solids 194, no. 1-2 (January 1996): 41–47. http://dx.doi.org/10.1016/0022-3093(95)00492-0.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

11

Semenova, L., and K. Prokhorov. "The analysis of the two-phonon resonant hyper-Raman effect." physica status solidi (c) 1, no. 11 (November 2004): 3118–21. http://dx.doi.org/10.1002/pssc.200405365.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

12

Fiederling, Kevin, Mostafa Abasifard, Martin Richter, Volker Deckert, Stefanie Gräfe, and Stephan Kupfer. "The chemical effect goes resonant – a full quantum mechanical approach on TERS." Nanoscale 12, no. 11 (2020): 6346–59. http://dx.doi.org/10.1039/c9nr09814c.

Повний текст джерела

Анотація:

The lately postulated Å resolution induced by (non-)resonant chemical interaction as well as by charge-transfer phenomena in plasmon-enhanced spectroscopies, i.e. in tip-enhanced Raman spectroscopy, was evaluated by a full quantum chemical approach.

Стилі APA, Harvard, Vancouver, ISO та ін.

13

Junjuri, Rajendhar, Ali Saghi, Lasse Lensu, and Erik M. Vartiainen. "Effect of non-resonant background on the extraction of Raman signals from CARS spectra using deep neural networks." RSC Advances 12, no. 44 (2022): 28755–66. http://dx.doi.org/10.1039/d2ra03983d.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

14

Jin, Kui-juan, Shao-hua Pan, and Guo-zhen Yang. "Fano effect of resonant Raman scattering in a semiconductor quantum well." Physical Review B 50, no. 12 (September 15, 1994): 8584–88. http://dx.doi.org/10.1103/physrevb.50.8584.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

15

Kong, J. F., W. Z. Shen, Y. W. Zhang, C. Yang, and X. M. Li. "Resonant Raman scattering probe of alloying effect in ZnMgO thin films." Applied Physics Letters 92, no. 19 (May 12, 2008): 191910. http://dx.doi.org/10.1063/1.2930676.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

16

Ramkumar, C., K. P. Jain, and S. C. Abbi. "Resonant Raman scattering probe of alloying effect inGaAs1−xPxternary alloy semiconductors." Physical Review B 54, no. 11 (September 15, 1996): 7921–28. http://dx.doi.org/10.1103/physrevb.54.7921.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

17

Kotsifaki, Domna G., Ranjan Rajiv Singh, Síle Nic Chormaic, and Truong Truong. "Asymmetric split-ring plasmonic nanostructures for the optical sensing of Escherichia coli." Biomedical Optics Express 14, no. 9 (August 25, 2023): 4875. http://dx.doi.org/10.1364/boe.497820.

Повний текст джерела

Анотація:

Strategies for in-liquid micro-organism detection are crucial for the clinical and pharmaceutical industries. While Raman spectroscopy is a promising label-free technique for micro-organism detection, it remains challenging due to the weak bacterial Raman signals. In this work, we exploit the unique electromagnetic properties of metamaterials to identify bacterial components in liquid using an array of Fano-resonant metamolecules. This Fano-enhanced Raman scattering (FERS) platform is designed to exhibit a Fano resonance close to the protein amide group fingerprint around 6030 nm. Raman signatures of Escherichia coli were recorded at several locations on the metamaterial under off-resonance laser excitation at 530 nm, where the photodamage effect is minimized. As the sizes of the Escherichia coli are comparable to the micro-gaps i.e, 0.41 µm, of the metamaterials, its local immobilisation leads to an increase in the Raman sensitivity. We also observed that the time-dependent FERS signal related to bacterial amide peaks increased during the bacteria’s mid-exponential phase while it decreased during the stationary phase. This work provides a new set of opportunities for developing ultrasensitive FERS platforms suitable for large-scale applications and could be particularly useful for diagnostics and environmental studies at off-resonance excitation.

Стилі APA, Harvard, Vancouver, ISO та ін.

18

Serebrennikova, Kseniya V., Anna N. Berlina, Dmitriy V. Sotnikov, Anatoly V. Zherdev, and Boris B. Dzantiev. "Raman Scattering-Based Biosensing: New Prospects and Opportunities." Biosensors 11, no. 12 (December 13, 2021): 512. http://dx.doi.org/10.3390/bios11120512.

Повний текст джерела

Анотація:

The growing interest in the development of new platforms for the application of Raman spectroscopy techniques in biosensor technologies is driven by the potential of these techniques in identifying chemical compounds, as well as structural and functional features of biomolecules. The effect of Raman scattering is a result of inelastic light scattering processes, which lead to the emission of scattered light with a different frequency associated with molecular vibrations of the identified molecule. Spontaneous Raman scattering is usually weak, resulting in complexities with the separation of weak inelastically scattered light and intense Rayleigh scattering. These limitations have led to the development of various techniques for enhancing Raman scattering, including resonance Raman spectroscopy (RRS) and nonlinear Raman spectroscopy (coherent anti-Stokes Raman spectroscopy and stimulated Raman spectroscopy). Furthermore, the discovery of the phenomenon of enhanced Raman scattering near metallic nanostructures gave impetus to the development of the surface-enhanced Raman spectroscopy (SERS) as well as its combination with resonance Raman spectroscopy and nonlinear Raman spectroscopic techniques. The combination of nonlinear and resonant optical effects with metal substrates or nanoparticles can be used to increase speed, spatial resolution, and signal amplification in Raman spectroscopy, making these techniques promising for the analysis and characterization of biological samples. This review provides the main provisions of the listed Raman techniques and the advantages and limitations present when applied to life sciences research. The recent advances in SERS and SERS-combined techniques are summarized, such as SERRS, SE-CARS, and SE-SRS for bioimaging and the biosensing of molecules, which form the basis for potential future applications of these techniques in biosensor technology. In addition, an overview is given of the main tools for success in the development of biosensors based on Raman spectroscopy techniques, which can be achieved by choosing one or a combination of the following approaches: (i) fabrication of a reproducible SERS substrate, (ii) synthesis of the SERS nanotag, and (iii) implementation of new platforms for on-site testing.

Стилі APA, Harvard, Vancouver, ISO та ін.

19

Alzahrani, Ali, Adel Alruqi, Bhupendra Karki, Milinda Kalutara Koralalage, Jacek Jasinski, and Gamini Sumanasekera. "Direct fabrication and characterization of vertically stacked Graphene/h-BN/Graphene tunnel junctions." Nano Express 2, no. 4 (December 1, 2021): 040010. http://dx.doi.org/10.1088/2632-959x/ac2e9e.

Повний текст джерела

Анотація:

Abstract We have used a lithography free technique for the direct fabrication of vertically stacked two-dimensional (2D) material-based tunnel junctions and characterized by Raman, AFM, XPS. We fabricated Graphene/h-BN/Graphene devices by direct deposition of graphene (bottom layer), h-BN (insulating barrier) and graphene (top layer) sequentially using a plasma enhanced chemical vapor deposition on Si/SiO2 substrates. The thickness of the h-BN insulating layer was varied by tuning the plasma power and the deposition time. Samples were characterized by Raman, AFM, and XPS. The I-V data follows the barrier thickness dependent quantum tunneling behavior for equally doped graphene layers. The resonant tunneling behavior was observed at room temperature for oppositely doped graphene layers where hydrazine and ammonia were used for n-doping of one of the graphene layers. The resonance with negative differential conductance occurs when the band structures of the two electrodes are aligned. The doping effect of the resonant peak is observed for varying doping levels. The results are explained according to the Bardeen tunneling model.

Стилі APA, Harvard, Vancouver, ISO та ін.

20

Rubin, Shimon, Phuong H. L. Nguyen, and Yeshaiahu Fainman. "The effect of DNA bases permutation on surface-enhanced Raman scattering spectrum." Nanophotonics 10, no. 5 (February 15, 2021): 1581–93. http://dx.doi.org/10.1515/nanoph-2021-0021.

Повний текст джерела

Анотація:

Abstract Surface-enhanced Raman scattering (SERS) process results in a tremendous increase of Raman scattering cross section of molecules adsorbed to plasmonic metals and influenced by numerous physico-chemical factors such as geometry and optical properties of the metal surface, orientation of chemisorbed molecules and chemical environment. While SERS holds promise for single molecule sensitivity and optical sensing of DNA sequences, more detailed understanding of the rich physico-chemical interplay between various factors is needed to enhance predictive power of existing and future SERS-based DNA sensing platforms. In this work, we report on experimental results indicating that SERS spectra of adsorbed single-stranded DNA (ssDNA) isomers depend on the order on which individual bases appear in the 3-base long ssDNA due to intramolecular interaction between DNA bases. Furthermore, we experimentally demonstrate that the effect holds under more general conditions when the molecules do not experience chemical enhancement due to resonant charge transfer effect and also under standard Raman scattering without electromagnetic or chemical enhancements. Our numerical simulations qualitatively support the experimental findings and indicate that base permutation results in modification of both Raman and chemically enhanced Raman spectra.

Стилі APA, Harvard, Vancouver, ISO та ін.

21

Chen, Yu-Ting, Lin Pan, Anke Horneber, Marius van den Berg, Peng Miao, Ping Xu, Pierre-Michel Adam, Alfred J. Meixner, and Dai Zhang. "Charge transfer and electromagnetic enhancement processes revealed in the SERS and TERS of a CoPc thin film." Nanophotonics 8, no. 9 (July 6, 2019): 1533–46. http://dx.doi.org/10.1515/nanoph-2019-0100.

Повний текст джерела

Анотація:

AbstractPhthalocyanines are frequently used as probing molecules in the field of single-molecule surface-enhanced Raman spectroscopy (SERS) and tip-enhanced Raman spectroscopy (TERS). In this work, we systematically compare the SERS and TERS spectra from a thin cobalt phthalocyanine (CoPc) film that is deposited on a Au film. The contributions from electromagnetic (EM), resonance, and charge-transfer enhancements are discussed. Radially and azimuthally polarized vector beams are used to investigate the influences of molecular orientation and the localized surface plasmon resonance (SPR). Furthermore, two different excitation wavelengths (636 and 532 nm) are used to study the resonant excitation effect as well as the involvement of the charge-transfer processes between CoPc and the Au substrate. It is shown that the Raman peaks of CoPc are mostly enhanced by 636 nm excitation through a combination of resonant excitation, high EM enhancement, and chemical enhancement via charge transfer from the metal to the molecule. At 532 nm excitation, however, the SERS and TERS spectra are dominated by photoluminescence, which originates from a photo-induced charge-transfer process from the optically excited molecule to the metal. The contributions of the different enhancement mechanisms explain the optical contrasts seen in the TERS images of Au nanodisks covered by the CoPc film. The insight achieved in this work will help to understand the optical contrast in sub- or single-molecule TERS imaging and apply SERS or TERS in the field of photocatalysis.

Стилі APA, Harvard, Vancouver, ISO та ін.

22

Gordeev, Georgy, Patryk Kusch, Benjamin S. Flavel, and Stephanie Reich. "(Invited) Raman Scattering By Exciton-Polaritons in Carbon Nanotubes." ECS Meeting Abstracts MA2022-01, no. 9 (July 7, 2022): 740. http://dx.doi.org/10.1149/ma2022-019740mtgabs.

Повний текст джерела

Анотація:

Resonant Raman scattering has been used for decades to study single walled carbon nanotubes (CNTs), but lacks a consistent theory that simultaneously explains all characteristic signatures. We argue that a proper description requires introducing exciton polaritons as couples excitonic and photonic states. We describe the polaritons by waveguided theory for a nanometre thick cylinder with modified dielectric function. During their propagation along the tube, the polaritons scatter with phonons and are re-emitted as photons with smaller energy (Stokes scattering event). This approach consistently explains the energetic positions of the Raman resonances for the radial-breathing mode (RBM), the G and the 2D line as well as the asymmetry in the scattering intensity of the incoming and outgoing resonances without resorting to higher-order scattering events. We measured the Raman effect on chirality-sorted nanotubes over the first and second exciton resonance and excellently predict its behaviour, which has not been achieved before. The formation of polaritonic states will affect other optical processes in CNTs. Furthermore, exciton-polariton effects appear inevitable in all one-dimensional excitonic systems, similar to our observations in single walled carbon nanotubes.

Стилі APA, Harvard, Vancouver, ISO та ін.

23

Wakita, Kazuki, Takayuki Miyazaki, Yasuhiro Kikuno, Souichi Takata, and Nobuyuki Yamamoto. "Resonant Raman Effect on a CuGaSe2Crystal Grown by the Traveling Heater Method." Japanese Journal of Applied Physics 38, Part 1, No. 2A (February 15, 1999): 664–67. http://dx.doi.org/10.1143/jjap.38.664.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

24

Wang, W. Z., C. L. Wang, A. R. Bishop, L. Yu, and Z. B. Su. "Dynamic Jahn-Teller effect inC60: Self-trapped excitons and resonant Raman scattering." Physical Review B 51, no. 15 (April 15, 1995): 10209–12. http://dx.doi.org/10.1103/physrevb.51.10209.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

25

Betancourt-Riera, Re, Ri Betancourt-Riera, J. M. Nieto Jalil, and R. Riera. "One phonon resonant Raman scattering in semiconductor quantum wires: Magnetic field effect." Physica B: Condensed Matter 410 (February 2013): 126–30. http://dx.doi.org/10.1016/j.physb.2012.09.062.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

26

Semenova, L. E., and K. A. Prokhorov. "Theoretical treatment of the resonant hyper-Raman effect in a CdS crystal." Laser Physics Letters 1, no. 5 (May 1, 2004): 253–58. http://dx.doi.org/10.1002/lapl.200310060.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

27

Brafman, O., Z. Vardeny, and E. Ehrenfreund. "Isotope effect in resonant Raman scattering and induced IR spectra of trans-polyacetylene." Solid State Communications 53, no. 7 (February 1985): 615–19. http://dx.doi.org/10.1016/0038-1098(85)90645-3.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

28

Verma, Prabhat, S. Anand, and K. P. Jain. "Excitonic effect in resonant Raman scattering by 2LO-phonon in CdS and ZnSe." Physica B: Condensed Matter 271, no. 1-4 (November 1999): 1–6. http://dx.doi.org/10.1016/s0921-4526(99)00241-0.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

29

Belitsky, V. I., C. Trallero-Giner, and M. Cardona. "Magnetopolaron effect in one-phonon resonant Raman scattering from bulk semiconductors: Deformation potential." Physical Review B 48, no. 24 (December 15, 1993): 17861–66. http://dx.doi.org/10.1103/physrevb.48.17861.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

30

Belitsky, V. I., C. Trallero-Giner, and M. Cardona. "Magnetopolaron effect in one-phonon resonant Raman scattering from bulk semiconductors: Fröhlich interaction." Physical Review B 49, no. 16 (April 15, 1994): 11016–20. http://dx.doi.org/10.1103/physrevb.49.11016.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

31

Ghandour, Ahmad J., David J. Dunstan, Andrei Sapelkin, Ignacio Hernandez, Matthew P. Halsall, and Iain F. Crowe. "Effect of water on resonant Raman spectroscopy of closed single-walled carbon nanotubes." physica status solidi (b) 248, no. 11 (October 18, 2011): 2548–51. http://dx.doi.org/10.1002/pssb.201100074.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

32

Vasilevskiy, M. I., and R. P. Miranda. "Is polaron effect important for resonant Raman scattering in self-assembled quantum dots?" physica status solidi (c) 2, no. 2 (February 2005): 862–66. http://dx.doi.org/10.1002/pssc.200460352.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

33

Klochikhin, A. A., and S. G. Ogloblin. "Effect of a Random Potential on the Resonant One-LO-Phonon Raman Process." physica status solidi (b) 151, no. 1 (January 1, 1989): 319–30. http://dx.doi.org/10.1002/pssb.2221510136.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

34

Karagodova, T. Ya. "Resonant fluorescence spectra of a multilevel system in intense radiation and external magnetic fields." Canadian Journal of Physics 77, no. 4 (August 1, 1999): 299–312. http://dx.doi.org/10.1139/p99-010.

Повний текст джерела

Анотація:

Theory and methods of computer simulations permit investigation of the interaction of high-power laser radiation, up to GW/cm2, with atoms having both small and large fine-structure intervals compared with interactions with a laser field and an external magnetic field. The modifications of the energies and population of atomic levels due to such interactions lead to nonlinear effects. Besides modifications in the Raman effect and new effects of rotation of the plane of polarization and circular dichroism that were investigated earlier, there are such nonlinear effects as the modification of the number, positions, intensities, and polarizations of the lines in the resonant fluorescence spectrum. Numerical experiments permit investigation of the characteristics of resonant fluorescence and comparison with known experimental results.PACS Nos.: 32.50, 78.20.L, 42.65, 42.50.H

Стилі APA, Harvard, Vancouver, ISO та ін.

35

Huang, Chien Wen, Yao Wu Hao, James Nyagilo, Digant P. Dave, Li Feng Xu, and Xian Kai Sun. "Porous Hollow Gold Nanoparticles for Cancer SERS Imaging." Journal of Nano Research 10 (April 2010): 137–48. http://dx.doi.org/10.4028/www.scientific.net/jnanor.10.137.

Повний текст джерела

Анотація:

Surface enhanced Raman spectroscopy (SERS) is a promising molecular imaging modality capable of simultaneously detecting multiple molecular biomarkers. With the biocompatibility and functionalizability of Au, Au-nanoparticle based Raman tags possess the potential for in vivo SERS cancer biomarker detection. Here, we report the large scale synthesis of a new type of Au nanoparticles, Porous Hollow Au Nanoparticles (PHAuNPs), and demonstrate their potential application as SERS imaging tags. PHAuNPs feature a sub-20 nm porous shell and a 50 nm void core. Such unique morphology enables them to strongly absorb and scatter near infrared lights due to the surface plasmon resonant effect of Au. This makes them particularly suitable for in vivo applications, where NIR wavelengths are considered as a ‘clear window’ for deeper penetration of light. The construction and characterization of PHAuNP-based Raman nanotag, including attachment of Raman dye, pegylation and their stability, are described. Cytotoxicity of Raman nanotags are tested using the radioactive [3H]thymidine incorporation method. The results show that pegylated Raman nanotags are stable and non-toxic and can potentially be used for in vivo applications.

Стилі APA, Harvard, Vancouver, ISO та ін.

36

Nathanson, B., and M. Rokni. "The effect of Stokes-antiStokes coupling on the gain of resonant stimulated Raman scattering." Journal of Physics D: Applied Physics 24, no. 3 (March 14, 1991): 233–36. http://dx.doi.org/10.1088/0022-3727/24/3/002.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

37

Peña-Álvarez, Miriam, Elena del Corro, Valentín G. Baonza, and Mercedes Taravillo. "Probing the Stress Effect on the Electronic Structure of Graphite by Resonant Raman Spectroscopy." Journal of Physical Chemistry C 118, no. 43 (October 17, 2014): 25132–40. http://dx.doi.org/10.1021/jp505730v.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

38

TAYAGAKI, TAKESHI, KOICHIRO TANAKA, NAOKI YONEMURA, MASANOBU SHIRAI, and KEN-ICHI KAN'NO. "SYMMETRY LOWERING IN THE PHOTOINDUCED PHASE IN SPIN-CROSSOVER COMPLEXES." International Journal of Modern Physics B 15, no. 28n30 (December 10, 2001): 3709–13. http://dx.doi.org/10.1142/s0217979201008482.

Повний текст джерела

Анотація:

We investigated the resonant Raman scattering of the spin-crossover complex, [ Fe(2-pic)3]Cl3EtOH , with varying the temperature and calarified for the first time that the photoinduced phase is completely different state from the thermally-induced phase. In the photoinduced phase we observed splits of Raman lines and a number of additional lines which are not observed in the high- and te low-temperature phase. These splits and appearances strongly indicate that a symmetry lowering should take place in the photoinduced phase. We imagined that the symmetry lowering is induced by the Jahn-Teller effect in the photo-excited state of the low-temperature phase.

Стилі APA, Harvard, Vancouver, ISO та ін.

39

Torii, H. "Pressure dependence of the liquid structure and the Raman noncoincidence effect of liquid methanol revisited." Pure and Applied Chemistry 76, no. 1 (January 1, 2004): 247–54. http://dx.doi.org/10.1351/pac200476010247.

Повний текст джерела

Анотація:

Pressure dependence of the liquid structure and the Raman noncoincidence effect of liquid methanol is examined with the combination of molecular dynamics (MD) simulations and the intermolecular resonant vibrational interactions determined by the transition dipole coupling (TDC) mechanism (MD/TDC method). It is shown that the observed decrease of the Raman noncoincidence νNCE of the CO stretching band with increasing density reported in the literature is quantitatively reproduced by the present calculation. As the density increases, the hydrogen bonds get slightly shorter, but molecules belonging to different hydrogen-bond chains get closer to each other to a greater extent. This anisotropic change in the liquid structure is the reason for the behavior of νNCE. It is also shown that the concentration dependence of νNCE in the methanol/CCl4 binary mixtures reported in a previous study, and the pressure dependence of νNCE in methanol may be described in a consistent way as a function of the number density of methanol in the liquid systems.

Стилі APA, Harvard, Vancouver, ISO та ін.

40

Mursu, J., H. Aksela, O.-P. Sairanen, A. Kivimäki, E. Nõmmiste, A. Ausmees, S. Svensson, and S. Aksela. "Decay of the , and states of Ar studied by utilizing the Auger resonant Raman effect." Journal of Physics B: Atomic, Molecular and Optical Physics 29, no. 19 (October 14, 1996): 4387–99. http://dx.doi.org/10.1088/0953-4075/29/19/012.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

41

Fewell, M. P., B. W. Shore, and K. Bergmann. "Coherent Population Transfer among Three States: Full Algebraic Solutions and the Relevance of Non Adiabatic Processes to Transfer by Delayed Pulses." Australian Journal of Physics 50, no. 2 (1997): 281. http://dx.doi.org/10.1071/p96071.

Повний текст джерела

Анотація:

Ongoing work aimed at developing highly efficient methods of populating a chosen sublevel of an energy level highlights the need to understand off-resonant effects in coherent excitation. This motivated us to re-examine some aspects of the theory of coherent excitation in a three-state system with a view to obtaining algebraic expressions for off-resonant eigenvalues and eigenvectors. Earlier work gives simple closed-form expressions for the eigenvalues this system, expressions applying even when the system is not on two-photon resonance. We present here expressions of similar simplicity for the components of the normalised eigenvectors. The analytic properties of these components explain the observed sensitivity of the stimulated-Raman-adiabatic-passage process (STIRAP) to the condition of two-photon resonance. None of the eigenstates is ‘trapped’ or ‘dark’ unless the system is on two-photon resonance; off resonance, all states have nonzero projections on the unperturbed intermediate state. A simple argument shows that no dressed state can be adiabatically connected to both the unperturbed initial and final states when the system is off two-photon resonance. That is, adiabatic transfer from initial to final state requires that these be degenerate before and after the STIRAP pulse sequence, and this implies zero two-photon detuning. However, substantial transfer probabilities are observed experimentally for very small two-photon detunings. We show that such systems are characterised by very sharp avoided crossings of two eigenvalues, and that the observed population transfer can be understood as an effect of non adiabatic transitions occurring at the avoided crossings.

Стилі APA, Harvard, Vancouver, ISO та ін.

42

Levshov, Dmitry, Thierry Michel, Matthieu Paillet, Xuan Tinh Than, Huy Nam Tran, Raul Arenal, Abdelali Rahmani, Mourad Boutahir, Ahmed-Azmi Zahab, and Jean-Louis Sauvajol. "Coupled Vibrations in Index-Identified Carbon Nanotubes." MRS Proceedings 1700 (2014): 69–77. http://dx.doi.org/10.1557/opl.2014.574.

Повний текст джерела

Анотація:

ABSTRACTCombining high resolution transmission electron spectroscopy, electron diffraction, and resonant Raman spectroscopy experiments on the same suspended (free-standing) individual carbon nanotubes is the ultimate approach to relate unambiguously the structure and the intrinsic phonon features of these nano-systems.By using this approach, the effect of coupling between nanotubes on the phonons is investigated in two model nano-systems: (i) a bundle of two non-identical SWNTs (inhomogeneous dimer), (ii) double-walled carbon nanotubes.

Стилі APA, Harvard, Vancouver, ISO та ін.

43

Torres Filho, Ivo P., James Terner, Roland N. Pittman, Leonardo G. Somera, and Kevin R. Ward. "Hemoglobin oxygen saturation measurements using resonance Raman intravital microscopy." American Journal of Physiology-Heart and Circulatory Physiology 289, no. 1 (July 2005): H488—H495. http://dx.doi.org/10.1152/ajpheart.01171.2004.

Повний текст джерела

Анотація:

A system is described for in vivo noninvasive measurements of hemoglobin oxygen saturation (HbO2Sat) at the microscopic level. The spectroscopic basis for the application is resonant Raman enhancement of Hb in the violet/ultraviolet region, allowing simultaneous identification of oxy- and deoxyhemoglobin with the same excitation wavelength. The heme vibrational bands are well known, but the technique has never been used to determine microvascular HbO2Sat in vivo. A diode laser light (power: 0.3 mW) was focused onto sample areas 15–30 μm in diameter. Raman spectra were obtained in backscattering geometry by using a microscope coupled to a spectrometer and a cooled detector. Calibration was performed in vitro by using glass capillaries containing blood at several Hb concentrations, equilibrated at various oxygen tensions. HbO2Sat was estimated using the Raman band intensities at 1,360 and 1,375 cm−1. Glass capillary path length and Hb concentration had no effect on HbO2Sat estimated from Raman spectra. In vivo observations were made in blood flowing in microvessels of the rat mesentery. The Hb Raman peaks observed in oxygenated and deoxygenated blood were consistent with earlier Raman studies that used Hb solutions and isolated cells. The method allowed HbO2Sat determinations in the whole range of arterioles, venules, and capillaries. Tissue transillumination allowed diameter and erythrocyte velocity measurements in the same vessels. Raman microspectroscopy offers distinct advantages over other currently used techniques by providing noninvasive and reliable in vivo determinations of HbO2Sat in thin tissues as well as in solid organs and tissues, which are unsuitable for techniques requiring transillumination.

Стилі APA, Harvard, Vancouver, ISO та ін.

44

Henstridge, M., M. Först, E. Rowe, M. Fechner, and A. Cavalleri. "Nonlocal nonlinear phononics." Nature Physics 18, no. 4 (March 7, 2022): 457–61. http://dx.doi.org/10.1038/s41567-022-01512-3.

Повний текст джерела

Анотація:

AbstractNonlinear phononics relies on the resonant optical excitation of infrared-active lattice vibrations to induce targeted structural deformations in solids. This form of dynamical crystal structure design has been applied to control the functional properties of many complex solids, including magnetic materials, superconductors and ferroelectrics. However, phononics has so far been restricted to protocols in which structural deformations occur within the optically excited volume, sometimes resulting in unwanted heating. Here, we extend nonlinear phononics to propagating polaritons, spatially separating the functional response from the optical drive. We use mid-infrared optical pulses to resonantly drive a phonon at the surface of ferroelectric LiNbO3. Time-resolved stimulated Raman scattering reveals that the ferroelectric polarization is reduced over the entire 50 µm depth of the sample, far beyond the micrometre depth of the evanescent phonon field. We attribute this effect to the anharmonic coupling between the driven mode and a polariton that propagates into the material. For high excitation amplitudes, we reach a regime in which the ferroelectric polarization is reversed, as revealed by a sign change in the Raman tensor coefficients of all the polar modes.

Стилі APA, Harvard, Vancouver, ISO та ін.

45

Gortel, Zbigniew W., and Dietrich Menzel. "Probing the time-dependent decay of molecular core-excited states: The Auger resonant Raman effect forO2." Physical Review A 58, no. 5 (November 1, 1998): 3699–704. http://dx.doi.org/10.1103/physreva.58.3699.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

46

Ohana, Israel, M. S. Dresselhaus, and S. Tanuma. "Resonant Raman effect and Fano distortion in the stage-2 graphite donor intercalation compound C/Rb." Physical Review B 43, no. 2 (January 15, 1991): 1773–76. http://dx.doi.org/10.1103/physrevb.43.1773.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

47

Brioude, A., J. Bellessa, S. Rabaste, B. Champagnon, L. Sphanel, J. Mugnier, and J. C. Plenet. "Resonant Raman effect enhanced by surface plasmon excitation of CdSe nanocrystals embedded in thin SiO2 films." Journal of Applied Physics 95, no. 5 (March 2004): 2744–48. http://dx.doi.org/10.1063/1.1628386.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

48

Wu, Kunjie, Kai Shen, Weifeng Liu, Liuer Wu, and Deliang Wang. "Resonant Raman study of dye instability in dye-sensitized TiO2 system: The effect of surface states." physica status solidi (a) 209, no. 7 (April 23, 2012): 1369–75. http://dx.doi.org/10.1002/pssa.201127729.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

49

Oura, Masaki, Yusuke Tamenori, Tatsuji Hayaishi, Masatake Machida, and Fumihiro Koike. "Manifestation of Auger Resonant Raman Effect on Double-Spectator Type Auger Transitions in the Ne [1s2p](3P)3p2 1P Resonant Double Excitation Region." Journal of the Physical Society of Japan 74, no. 4 (April 2005): 1154–59. http://dx.doi.org/10.1143/jpsj.74.1154.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

50

Dörfler, Andreas, Afsaneh Asgariyan Tabrizi, Timo Stubler, and Andreas Ruediger. "Generalized model of laser-induced peak asymmetry in Raman lines." Applied Physics Letters 121, no. 6 (August 8, 2022): 063501. http://dx.doi.org/10.1063/5.0093350.

Повний текст джерела

Анотація:

The rate and precision at which samples can be scanned by Raman spectroscopy strongly depend on laser and material parameters. In this article, we describe the trade-off between parameters that increased laser intensities to improve resolution and reduce integration times, and its effect on thermally induced shift and asymmetric broadening of the line profile, especially in the case of resonant Raman. We present an analytical approximation to describe this phenomenon for all volumetrically absorbing materials and a wide range of laser parameters. This allows the determination of an optimal scan rate for the sample material and the required optical resolution, or vice versa, the determination and accurate correction for thermally induced shifts and asymmetries. This study provides an analytical quantification of this often-neglected line asymmetry and allows us to correct for its impact on the signal with few material properties and laser parameters. It may, in particular, allow us to discriminate this effect against other sources of peak asymmetry due to intrinsic properties. We obtain this analytical expression by condensing a parametrized finite element method model into a heuristic probability density function of temperature that describes the full parameter space. This function can be applied to any thermally undistorted line shape by convolution to determine a corrected line profile. This profile then provides a parameter-dependent optimized fitting function for an optimal determination of Raman signal parameters.

Стилі APA, Harvard, Vancouver, ISO та ін.

Статті в журналах з теми "Resonant Raman Effect"

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями