Статті в журналах: "Ultrafast Raman Spectroscopy"

1

Umapathy, Siva, Adithya Lakshmanna, and Babita Mallick. "Ultrafast Raman loss spectroscopy." Journal of Raman Spectroscopy 40, no. 3 (March 2009): 235–37. http://dx.doi.org/10.1002/jrs.2199.

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2

Keller, Emily L., Nathaniel C. Brandt, Alyssa A. Cassabaum, and Renee R. Frontiera. "Ultrafast surface-enhanced Raman spectroscopy." Analyst 140, no. 15 (2015): 4922–31. http://dx.doi.org/10.1039/c5an00869g.

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3

Lindley, Matthew, Kotaro Hiramatsu, Hayate Nomoto, Fukashi Shibata, Tsuyoshi Takeshita, Shigeyuki Kawano, and Keisuke Goda. "Ultrafast Simultaneous Raman-Fluorescence Spectroscopy." Analytical Chemistry 91, no. 24 (November 27, 2019): 15563–69. http://dx.doi.org/10.1021/acs.analchem.9b03563.

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4

Qiu, Xueqiong, Xiuting Li, Kai Niu, and Soo-Y. Lee. "Inverse Raman bands in ultrafast Raman loss spectroscopy." Journal of Chemical Physics 135, no. 16 (October 28, 2011): 164502. http://dx.doi.org/10.1063/1.3653940.

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5

Suemoto, Tohru, Koichiro Tanaka, and Hideyuki Ohtake. "Ultrafast electronic raman spectroscopy in semiconductors." Progress in Crystal Growth and Characterization of Materials 33, no. 1-3 (January 1996): 57–63. http://dx.doi.org/10.1016/0960-8974(96)83613-8.

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6

Gruenke, Natalie L., M. Fernanda Cardinal, Michael O. McAnally, Renee R. Frontiera, George C. Schatz, and Richard P. Van Duyne. "Ultrafast and nonlinear surface-enhanced Raman spectroscopy." Chemical Society Reviews 45, no. 8 (2016): 2263–90. http://dx.doi.org/10.1039/c5cs00763a.

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7

RAI, N. K., A. Y. LAKSHMANNA, V. V. NAMBOODIRI, and S. UMAPATHY. "Basic principles of ultrafast Raman loss spectroscopy#." Journal of Chemical Sciences 124, no. 1 (January 2012): 177–86. http://dx.doi.org/10.1007/s12039-012-0214-8.

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8

Petrich, J. W., and J. L. Martin. "Ultrafast absorption and Raman spectroscopy of hemeproteins." Chemical Physics 131, no. 1 (March 1989): 31–47. http://dx.doi.org/10.1016/0301-0104(89)87079-x.

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9

Ferrante, Carino, Alessandra Virga, Lara Benfatto, Miles Martinati, Domenico De Fazio, Ugo Sassi, Claudia Fasolato, et al. "Raman spectroscopy of graphene under ultrafast laser excitation." EPJ Web of Conferences 205 (2019): 05003. http://dx.doi.org/10.1051/epjconf/201920505003.

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The out-of-equilibrium Raman response of graphene is addressed by pulsed laser excitation. Phonon spectrum is rationalized by revisiting the electron-phonon picture in the light of a transient broadening of the Dirac cone.

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10

Rohringer, Nina. "X-ray Raman scattering: a building block for nonlinear spectroscopy." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, no. 2145 (April 2019): 20170471. http://dx.doi.org/10.1098/rsta.2017.0471.

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Ultraintense X-ray free-electron laser pulses of attosecond duration can enable new nonlinear X-ray spectroscopic techniques to observe coherent electronic motion. The simplest nonlinear X-ray spectroscopic concept is based on stimulated electronic X-ray Raman scattering. We present a snapshot of recent experimental achievements, paving the way towards the goal of realizing nonlinear X-ray spectroscopy. In particular, we review the first proof-of-principle experiments, demonstrating stimulated X-ray emission and scattering in atomic gases in the soft X-ray regime and first results of stimulated hard X-ray emission spectroscopy on transition metal complexes. We critically asses the challenges that have to be overcome for future successful implementation of nonlinear coherent X-ray Raman spectroscopy. This article is part of the theme issue ‘Measurement of ultrafast electronic and structural dynamics with X-rays’.

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11

Donaldson, Paul M. "Photon echoes and two dimensional spectra of the amide I band of proteins measured by femtosecond IR – Raman spectroscopy." Chemical Science 11, no. 33 (2020): 8862–74. http://dx.doi.org/10.1039/d0sc02978e.

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12

Kremer, Friedrich. "M.D. Fayer (ed): Ultrafast Infrared and Raman Spectroscopy." Colloid and Polymer Science 284, no. 7 (March 7, 2006): 822. http://dx.doi.org/10.1007/s00396-005-1431-1.

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13

Mallick, Babita, Adithya Lakhsmanna, and Siva Umapathy. "Ultrafast Raman loss spectroscopy (URLS): instrumentation and principle." Journal of Raman Spectroscopy 42, no. 10 (June 15, 2011): 1883–90. http://dx.doi.org/10.1002/jrs.2996.

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14

Tang, Longteng, Yanli Wang, Liangdong Zhu, Karen Kallio, S. James Remington, and Chong Fang. "Photoinduced proton transfer inside an engineered green fluorescent protein: a stepwise–concerted-hybrid reaction." Physical Chemistry Chemical Physics 20, no. 18 (2018): 12517–26. http://dx.doi.org/10.1039/c8cp01907j.

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15

Mondal, Sayan, and Mrinalini Puranik. "Ultrafast structural dynamics of photoexcited adenine." Physical Chemistry Chemical Physics 19, no. 30 (2017): 20224–40. http://dx.doi.org/10.1039/c7cp03092d.

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16

Bout, David Vanden, and Mark Berg. "Ultrafast Raman echo experiments in liquids." Journal of Raman Spectroscopy 26, no. 7 (July 1995): 503–11. http://dx.doi.org/10.1002/jrs.1250260705.

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17

Kuramochi, Hikaru, and Tahei Tahara. "Tracking Ultrafast Structural Dynamics by Time-Domain Raman Spectroscopy." Journal of the American Chemical Society 143, no. 26 (June 7, 2021): 9699–717. http://dx.doi.org/10.1021/jacs.1c02545.

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18

Tas, Guray, Jens Franken, Selezion A. Hambir, David E. Hare, and Dana D. Dlott. "Ultrafast Raman Spectroscopy of Shock Fronts in Molecular Solids." Physical Review Letters 78, no. 24 (June 16, 1997): 4585–88. http://dx.doi.org/10.1103/physrevlett.78.4585.

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19

Zhao, Yang, Sheng Zhang, Boyang Zhou, Rongwei Fan, Deying Chen, Zhonghua Zhang, and Yuanqin Xia. "Molecular vibrational dynamics in PMMA studied by femtosecond CARS." Modern Physics Letters B 28, no. 28 (November 10, 2014): 1450222. http://dx.doi.org/10.1142/s0217984914502224.

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The ultrafast molecular vibrational dynamics in PMMA sheets is studied by femtosecond time-resolved coherent anti-Stokes Raman spectroscopy at room temperature. The C – H stretch modes at 2870 cm-1 and 3008 cm-1 in PMMA sheets are excited and detected. The coherence relaxation times and beat wavenumbers of the Raman modes are obtained.

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20

Han, Fangyuan, Weimin Liu, Liangdong Zhu, Yanli Wang, and Chong Fang. "Initial hydrogen-bonding dynamics of photoexcited coumarin in solution with femtosecond stimulated Raman spectroscopy." Journal of Materials Chemistry C 4, no. 14 (2016): 2954–63. http://dx.doi.org/10.1039/c5tc03598h.

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The ultrafast hydrogen bond breaking and reformation dynamics at the carbonyl site of a coumarin 102 dye molecule in ethanol is captured by femtosecond stimulated Raman spectroscopy (FSRS) on the femtosecond and picosecond timescales.

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21

Jana, Sanjib, Adithya Lakshmanna Yapamanu, and Siva Umapathy. "Unraveling structural dynamics in isoenergetic excited S1 and multi-excitonic 1(TT) states of 9,10-bis(phenylethynyl)anthracene (BPEA) in solution via ultrafast Raman loss spectroscopy." Physical Chemistry Chemical Physics 21, no. 26 (2019): 14341–49. http://dx.doi.org/10.1039/c8cp06658b.

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22

Kuramochi, Hikaru, Satoshi Takeuchi, Hironari Kamikubo, Mikio Kataoka, and Tahei Tahara. "Fifth-order time-domain Raman spectroscopy of photoactive yellow protein for visualizing vibrational coupling in its excited state." Science Advances 5, no. 6 (June 2019): eaau4490. http://dx.doi.org/10.1126/sciadv.aau4490.

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We report fifth-order time-domain Raman spectroscopy of photoactive yellow protein (PYP), with the aim to visualize vibrational coupling in its excited state. After the ultrashort actinic pump pulse prepared the vibrational coherence and population in the excited state, the evolving vibrational structure was tracked by time-resolved impulsive stimulated Raman spectroscopy using sub–7-fs pulses. The obtained fifth-order time-domain Raman data were translated to a two-dimensional (2D) frequency-frequency correlation map, which visualizes the correlation between low- and high-frequency vibrational modes of the excited state. The 2D map of PYP reveals a cross peak, indicating the coupling between the phenolic C─O stretch mode of the chromophore and the low-frequency modes (~160 cm−1), assignable to the intermolecular motions involving the surrounding hydrogen-bonded amino acids. The unveiled coupling suggests the importance of the low-frequency vibrational motion in the primary photoreaction of PYP, highlighting the unique capability of this spectroscopic approach for studying ultrafast reaction dynamics.

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23

Jen, Myungsam, Sebok Lee, Gisang Lee, Daedu Lee, and Yoonsoo Pang. "Intramolecular Charge Transfer of Curcumin and Solvation Dynamics of DMSO Probed by Time-Resolved Raman Spectroscopy." International Journal of Molecular Sciences 23, no. 3 (February 2, 2022): 1727. http://dx.doi.org/10.3390/ijms23031727.

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Intramolecular charge transfer (ICT) of curcumin in dimethyl sulfoxide (DMSO) solution in the excited state was investigated by femtosecond electronic and vibrational spectroscopy. Excited-state Raman spectra of curcumin in the locally-excited and charge-transferred (CT) state of the S1 excited state were separated due to high temporal (<50 fs) and spectral (<10 cm−1) resolutions of femtosecond stimulated Raman spectroscopy. The ultrafast (0.6–0.8 ps) ICT and subsequent vibrational relaxation (6–9 ps) in the CT state were ubiquitously observed in the ground- and excited-state vibrational modes of the solute curcumin and the νCSC and νS=O modes of solvent DMSO. The ICT of curcumin in the excited state was preceded by the disruption of the solvation shells, including the breakage of hydrogen bonding between curcumin and DMSO molecules, which occurs at the ultrafast (20–50 fs) time scales.

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24

OCKMAN, NATHAN, WUBAO WANG, and R. R. ALFANO. "APPLICATIONS OF ULTRAFAST LASER SPECTROSCOPY TO THE STUDY OF SEMICONDUCTOR PHYSICS." International Journal of Modern Physics B 05, no. 20 (December 1991): 3165–234. http://dx.doi.org/10.1142/s0217979291001255.

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This article reviews the application of some of the principal methods of picosecond and femtosecond laser spectroscopy to the investigation of the dynamics of carriers, phonons and surface structure in semiconductors. The measurement of the temporal evolution of photoinduced luminescence, absorption, reflection and scattering in semiconductors makes it possible to obtain the lifetimes of photogenerated electrons, holes, excitons and phonons in both the bulk and quantum wells and superlattice structures. The information produced by these studies is necessary for the basic understanding of the underlying physics of semiconductors. In addition, the parameters obtained from these studies are needed for evaluating ultrafast transport, switching, photoconductive response and imaging in semiconductor materials, which will determine their limitations for use in high-speed and high-frequency devices and computers. For measuring time resolved luminescence, the principal techniques used, namely, the streak camera, the optical Kerr gate and the up-conversion gate are thoroughly discussed. Several pump and probe methods are described for the determination of time resolved absorption, reflection and Raman scattering. For absorption measurements where the probe wavelength differs from the pump, the former is generated in nonlinear media by means of stimulated Raman scattering and the supercontinuum for the UV and visible regions and by parametric and difference frequency generation for the near- and mid-IR. Nonlinear optics techniques considered are degenerate and nondegenerate four-wave mixing and transient grattings among which photon echoes yield the momentum relaxation of hot electrons. Coherent anti-Stokes Raman scattering (CARS) and phase conjugate Raman scattering (PC) are described to determine phonon dephasing times and the nonlinear susceptibility, χ3.

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25

Madonini, Francesca, and Federica Villa. "Single Photon Avalanche Diode Arrays for Time-Resolved Raman Spectroscopy." Sensors 21, no. 13 (June 23, 2021): 4287. http://dx.doi.org/10.3390/s21134287.

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The detection of peaks shifts in Raman spectroscopy enables a fingerprint reconstruction to discriminate among molecules with neither labelling nor sample preparation. Time-resolved Raman spectroscopy is an effective technique to reject the strong fluorescence background that profits from the time scale difference in the two responses: Raman photons are scattered almost instantaneously while fluorescence shows a nanoseconds time constant decay. The combination of short laser pulses with time-gated detectors enables the collection of only those photons synchronous with the pulse, thus rejecting fluorescent ones. This review addresses time-gating issues from the sensor standpoint and identifies single photon avalanche diode (SPAD) arrays as the most suitable single-photon detectors to be rapidly and precisely time-gated without bulky, complex, or expensive setups. At first, we discuss the requirements for ideal Raman SPAD arrays, particularly focusing on the design guidelines for optimized on-chip processing electronics. Then we present some existing SPAD-based architectures, featuring specific operation modes which can be usefully exploited for Raman spectroscopy. Finally, we highlight key aspects for future ultrafast Raman platforms and highly integrated sensors capable of undistorted identification of Raman peaks across many pixels.

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26

Li, Mingze, Tingbo Zhang, Lei Gao, Yunjia Wei, Xingce Fan, Yihang He, Xianghong Niu, Jinlan Wang, and Teng Qiu. "Monitoring substrate-induced electron–phonon coupling at interfaces of 2D organic/inorganic van der Waals heterostructures with in situ Raman spectroscopy." Applied Physics Letters 120, no. 18 (May 2, 2022): 181602. http://dx.doi.org/10.1063/5.0090982.

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Multifunctional devices based on 2D organic/inorganic van der Waals heterostructures (2D OIHs) exhibit excellent properties due to extensive and flexible structural tunability. However, how to precisely regulate devices via in situ monitoring technique remains a great challenge, and corresponding development is still in its infancy. In this Letter, we show that Raman spectroscopy can serve as an effective in situ detection strategy to systematically observe the interfacial electron–phonon coupling (IEPC) between substrate and 2D OIHs. Combining non-adiabatic molecular dynamics simulations with ultrafast spectroscopy, we reveal that the different strengths of IEPC between substrates and 2D OIHs can directly modulate the photocarrier lifetimes of inorganic 2D materials, and therefore, indirectly modify the Raman-sensitive photo-induced charge transfer processes at the interface of 2D OIHs. Further in situ Raman evidence demonstrates the unique advantage of Raman spectroscopy with high sensitivity to monitor different substrate-induced IEPC under variable temperature.

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27

Schmälzlin, Elmar, Benito Moralejo, Daniel Bodenmüller, Maxim E. Darvin, Gisela Thiede, and Martin M. Roth. "Ultrafast imaging Raman spectroscopy of large-area samples without stepwise scanning." Journal of Sensors and Sensor Systems 5, no. 2 (July 13, 2016): 261–71. http://dx.doi.org/10.5194/jsss-5-261-2016.

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Abstract. Step-by-step, time-consuming scanning of the sample is still the state-of-the-art in imaging Raman spectroscopy. Even for a few 100 image points the measurement time may add up to minutes or hours. A radical decrease in measurement time can be achieved by applying multiplex spectrographs coupled to imaging fiber bundles that are successfully used in astronomy. For optimal use of the scarce and expensive observation time at astronomical observatories, special high-performance spectrograph systems were developed. They are designed for recording thousands of spatially resolved spectra of a two-dimensional image field within one single exposure. Transferring this technology to imaging Raman spectroscopy allows a considerably faster acquisition of chemical maps. Currently, an imaging field of up to 1 cm2 can be investigated. For porcine skin the required measurement time is less than 1 min. For this reason, this technique is of particular interest for medical diagnostics, e.g., the identification of potentially cancerous abnormalities of skin tissue.

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28

Oscar, Breland G., Weimin Liu, Nikita D. Rozanov, and Chong Fang. "Ultrafast intermolecular proton transfer to a proton scavenger in an organic solvent." Physical Chemistry Chemical Physics 18, no. 37 (2016): 26151–60. http://dx.doi.org/10.1039/c6cp05692j.

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29

Andrikopoulos, Prokopis C., Yingliang Liu, Alessandra Picchiotti, Nils Lenngren, Miroslav Kloz, Aditya S. Chaudhari, Martin Precek, et al. "Femtosecond-to-nanosecond dynamics of flavin mononucleotide monitored by stimulated Raman spectroscopy and simulations." Physical Chemistry Chemical Physics 22, no. 12 (2020): 6538–52. http://dx.doi.org/10.1039/c9cp04918e.

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30

Dhiman, Abhijeet, Nolan S. Lewis, Ayotomi Olokun, and Vikas Tomar. "Local Shock Properties Measurement Using Time-Resolved Raman Spectroscopy." EPJ Web of Conferences 250 (2021): 01023. http://dx.doi.org/10.1051/epjconf/202125001023.

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In this article, the dynamic response of a heterogeneous microstructure of polymer bonded composite was analyzed to a short duration shock pulse. The composite microstructure studied is a polymerbonded sugar (PBS) with single-crystal sucrose embedded inside the polydimethylsiloxane binder. The shock pulse was created by the impact of the aluminum disk at high speeds using a laser-based projectile launch system. The mechanical response on the microscale domain was measured using ultrafast time-resolved Raman spectroscopy. The in-situ analysis of the change in Raman spectra from PBS during shock compression was captured in the time domain using a streak camera. The results show a steeply rising shock front after the impact where the shock pressure rise time was estimated from the time-resolved Raman spectra. The viscoplastic behavior in the local microscale domain was characterized by quantifying effective shock viscosity measured in the vicinity of the crystal-binder interface.

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31

Ross, Calum A., David G. MacLachlan, Brian J. E. Smith, Rainer J. Beck, Jonathan D. Shephard, Nick Weston, and Robert R. Thomson. "A Miniature Fibre-Optic Raman Probe Fabricated by Ultrafast Laser-Assisted Etching." Micromachines 11, no. 2 (February 11, 2020): 185. http://dx.doi.org/10.3390/mi11020185.

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Optical biopsy describes a range of medical procedures in which light is used to investigate disease in the body, often in hard-to-reach regions via optical fibres. Optical biopsies can reveal a multitude of diagnostic information to aid therapeutic diagnosis and treatment with higher specificity and shorter delay than traditional surgical techniques. One specific type of optical biopsy relies on Raman spectroscopy to differentiate tissue types at the molecular level and has been used successfully to stage cancer. However, complex micro-optical systems are usually needed at the distal end to optimise the signal-to-noise properties of the Raman signal collected. Manufacturing these devices, particularly in a way suitable for large scale adoption, remains a critical challenge. In this paper, we describe a novel fibre-fed micro-optic system designed for efficient signal delivery and collection during a Raman spectroscopy-based optical biopsy. Crucially, we fabricate the device using a direct-laser-writing technique known as ultrafast laser-assisted etching which is scalable and allows components to be aligned passively. The Raman probe has a sub-millimetre diameter and offers confocal signal collection with 71.3% ± 1.5% collection efficiency over a 0.8 numerical aperture. Proof of concept spectral measurements were performed on mouse intestinal tissue and compared with results obtained using a commercial Raman microscope.

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32

Batten, Tim, and Olga Milikofu. "Characterising Strain/Stress and Defects in SiC Wafers Using Raman Imaging." Materials Science Forum 821-823 (June 2015): 229–32. http://dx.doi.org/10.4028/www.scientific.net/msf.821-823.229.

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Raman spectroscopy is a well established non-destructive tool for determining crystal polytypes, strain/stress, electronic properties and material quality in SiC. Here we report on the application of ultrafast Raman imaging to a SiC wafer, allowing 870,908 spectra to be collected from a 2 inch 4H-SiC wafer, in 75 minutes. Analysis of the acquired data enabled us to locate and investigate defects and surface contamination and also allowed stress in the wafer to be characterised.

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33

Towrie, Michael, Anders Gabrielsson, Pavel Matousek, Anthony W. Parker, Ana Maria Blanco Rodriguez, and Antonín Vlček. "A High-Sensitivity Femtosecond to Microsecond Time-Resolved Infrared Vibrational Spectrometer." Applied Spectroscopy 59, no. 4 (April 2005): 467–73. http://dx.doi.org/10.1366/0003702053641397.

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We describe an apparatus that provides, for the first time, a seamless bridge between femtosecond and microsecond time-resolved Raman and infrared vibrational spectroscopy. The laser system comprises an actively Q-switched sub-nanosecond pulsed kilohertz laser electronically synchronized to an ultrafast titanium sapphire regenerative amplifier to within 0.2 ns. The ultrafast amplifier provides the stable probe light source enabling high-sensitivity infrared vibrational spectroscopy of transients. Time-resolved infrared spectra of the excited-state relaxation dynamics of metal carbonyl compounds are presented to illustrate the capability of the apparatus, and transient data is resolved from 1 picosecond to over 100 microseconds. The results are compared to conventional nanosecond Fourier transform infrared (FT-IR) and laser based flash photolysis time-resolved infrared technology.

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34

Heisler, Ismael A., Kamila Mazur, Sayuri Yamaguchi, Keisuke Tominaga, and Stephen R. Meech. "Measuring acetic acid dimer modes by ultrafast time-domain Raman spectroscopy." Physical Chemistry Chemical Physics 13, no. 34 (2011): 15573. http://dx.doi.org/10.1039/c1cp20990f.

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35

Tauber, Michael J., Richard A. Mathies, Xiyi Chen, and Stephen E. Bradforth. "Flowing liquid sample jet for resonance Raman and ultrafast optical spectroscopy." Review of Scientific Instruments 74, no. 11 (November 2003): 4958–60. http://dx.doi.org/10.1063/1.1614874.

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36

Yoshizawa, Masayuki, Masaki Kubo, and Makoto Kurosawa. "Ultrafast photoisomerization in DCM dye observed by new femtosecond Raman spectroscopy." Journal of Luminescence 87-89 (May 2000): 739–41. http://dx.doi.org/10.1016/s0022-2313(99)00381-6.

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37

Werncke, Wolfgang, Sebastian Wachsmann-Hogiu,, Jens Dreyer, Alexander Ivanovich Vodchits, and Thomas Elsaesser. "Ultrafast Intramolecular Electron Transfer Studied by Picosecond and Stationary Raman Spectroscopy." Bulletin of the Chemical Society of Japan 75, no. 5 (May 2002): 1049–55. http://dx.doi.org/10.1246/bcsj.75.1049.

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38

Ziegler, Lawrence D., and Anne B. Myers. "Foreword to the special issue on Raman resonances in ultrafast spectroscopy." Journal of Raman Spectroscopy 26, no. 7 (July 1995): 493–94. http://dx.doi.org/10.1002/jrs.1250260703.

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39

Laubereau, Alfred, and Robert Laenen. "ChemInform Abstract: Ultrafast Coherent Raman and Infrared Spectroscopy of Liquid Systems." ChemInform 32, no. 50 (May 23, 2010): no. http://dx.doi.org/10.1002/chin.200150299.

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40

Mizutani, Yasuhisa, and Teizo Kitagawa. "Ultrafast dynamics of myoglobin probed by time-resolved resonance Raman spectroscopy." Chemical Record 1, no. 3 (2001): 258–75. http://dx.doi.org/10.1002/tcr.1012.

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41

Umapathy, S., B. Mallick, and A. Lakshmanna. "Mode-dependent dispersion in Raman line shapes: Observation and implications from ultrafast Raman loss spectroscopy." Journal of Chemical Physics 133, no. 2 (July 14, 2010): 024505. http://dx.doi.org/10.1063/1.3464332.

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42

Keefer, Daniel, Victor M. Freixas, Huajing Song, Sergei Tretiak, Sebastian Fernandez-Alberti, and Shaul Mukamel. "Monitoring molecular vibronic coherences in a bichromophoric molecule by ultrafast X-ray spectroscopy." Chemical Science 12, no. 14 (2021): 5286–94. http://dx.doi.org/10.1039/d0sc06328b.

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Coherences during the non-adiabatic dynamics of a bichromophoric molecules are probed via stimulated X-ray Raman signals. They survive for several hundred femtoseconds, despite highly heterogeneous contributions across the molecular sampling space.

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43

Zhang, Zhihao, Fangbo Zhang, Bo Xu, Hongqiang Xie, Botao Fu, Xu Lu, Ning Zhang, et al. "High-Sensitivity Gas Detection with Air-Lasing-Assisted Coherent Raman Spectroscopy." Ultrafast Science 2022 (April 8, 2022): 1–8. http://dx.doi.org/10.34133/2022/9761458.

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Remote or standoff detection of greenhouse gases, air pollutants, and biological agents with innovative ultrafast laser technology attracts growing interests in recent years. Hybrid femtosecond/picosecond coherent Raman spectroscopy is considered as one of the most versatile techniques due to its great advantages in terms of detection sensitivity and chemical specificity. However, the simultaneous requirement for the femtosecond pump and the picosecond probe increases the complexity of optical system. Herein, we demonstrate that air lasing naturally created inside a filament can serve as an ideal light source to probe Raman coherence excited by the femtosecond pump, producing coherent Raman signal with molecular vibrational signatures. The combination of pulse self-compression effect and air lasing action during filamentation improves Raman excitation efficiency and greatly simplifies the experimental setup. The air-lasing-assisted Raman spectroscopy was applied to quantitatively detect greenhouse gases mixed in air, and it was found that the minimum detectable concentrations of CO2 and SF6 can reach 0.1% and 0.03%, respectively. The ingenious designs, especially the optimization of pump-seed delay and the choice of perpendicular polarization, ensure a high detection sensitivity and signal stability. Moreover, it is demonstrated that this method can be used for simultaneously measuring CO2 and SF6 gases and distinguishing 12CO2 and 13CO2. The developed scheme provides a new route for high-sensitivity standoff detection and combustion diagnosis.

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Lee, Sebok, Myungsam Jen, and Yoonsoo Pang. "Twisted Intramolecular Charge Transfer State of a “Push-Pull” Emitter." International Journal of Molecular Sciences 21, no. 21 (October 27, 2020): 7999. http://dx.doi.org/10.3390/ijms21217999.

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The excited state Raman spectra of 4-dicyanomethylene-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) in the locally-excited (LE) and the intramolecular charge transfer (ICT) states have been separately measured by time-resolved stimulated Raman spectroscopy. In a polar dimethylsulfoxide solution, the ultrafast ICT of DCM with a time constant of 1.0 ps was observed in addition to the vibrational relaxation in the ICT state of 4–7 ps. On the other hand, the energy of the ICT state of DCM becomes higher than that of the LE state in a less polar chloroform solution, where the initially-photoexcited ICT state with the LE state shows the ultrafast internal conversion to the LE state with a time constant of 300 fs. The excited-state Raman spectra of the LE and ICT state of DCM showed several major vibrational modes of DCM in the LE and ICT conformer states coexisting in the excited state. Comparing to the time-dependent density functional theory simulations and the experimental results of similar push-pull type molecules, a twisted geometry of the dimethylamino group is suggested for the structure of DCM in the S1/ICT state.

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45

Deàk, John C., Lawrence K. Iwaki, and Dana D. Dlott. "Vibrational Energy Redistribution in Polyatomic Liquids: Ultrafast IR−Raman Spectroscopy of Acetonitrile." Journal of Physical Chemistry A 102, no. 42 (October 1998): 8193–201. http://dx.doi.org/10.1021/jp9822743.

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46

Deàk, John C., Lawrence K. Iwaki, and Dana D. Dlott. "Vibrational Energy Redistribution in Polyatomic Liquids: Ultrafast IR−Raman Spectroscopy of Nitromethane." Journal of Physical Chemistry A 103, no. 8 (February 1999): 971–79. http://dx.doi.org/10.1021/jp9839899.

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47

Tsen, K. T., C. Poweleit, D. K. Ferry, Hai Lu, and William J. Schaff. "Observation of large electron drift velocities in InN by ultrafast Raman spectroscopy." Applied Physics Letters 86, no. 22 (May 30, 2005): 222103. http://dx.doi.org/10.1063/1.1931048.

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48

Dasgupta, Jyotishman, Renee R. Frontiera, Keenan C. Taylor, J. Clark Lagarias, and Richard A. Mathies. "Ultrafast excited-state isomerization in phytochrome revealed by femtosecond stimulated Raman spectroscopy." Proceedings of the National Academy of Sciences 106, no. 6 (January 29, 2009): 1784–89. http://dx.doi.org/10.1073/pnas.0812056106.

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49

Jen, Myungsam, Sebok Lee, Kooknam Jeon, Shafqat Hussain, and Yoonsoo Pang. "Ultrafast Intramolecular Proton Transfer of Alizarin Investigated by Femtosecond Stimulated Raman Spectroscopy." Journal of Physical Chemistry B 121, no. 16 (April 13, 2017): 4129–36. http://dx.doi.org/10.1021/acs.jpcb.6b12408.

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50

Materny, Arnulf. "Book Review: Ultrafast Infrared and Raman Spectroscopy Edited by Michael D. Fayer." ChemPhysChem 2, no. 8-9 (September 17, 2001): 557. http://dx.doi.org/10.1002/1439-7641(20010917)2:8/9<557::aid-cphc2222557>3.0.co;2-6.

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