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Articles de revues sur le sujet « Raman resonance »

Auteur : Grafiati
Publié le 9 mars 2023

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1

Kitagawa, Teizo. « Resonance Raman spectroscopy ». Journal of Porphyrins and Phthalocyanines 06, no 04 (avril 2002) : 301–2. http://dx.doi.org/10.1142/s1088424602000361.

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The main topics in resonance Raman spectroscopy presented at ICPP-2 in Kyoto are briefly discussed. These include: (i) coherent spectroscopy and low frequency vibrations of ligand-photodissociated heme proteins, (ii) vibrational relaxation revealed by time-resolved anti-Stokes Raman spectroscopy, (iii) electron transfer in porphyrin arrays, (iv) vibrational assignments of tetraazaporphyrins and (v) resonance Raman spectra of an NO storing protein, nitrophorin.
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2

Yannoni, C. S., R. D. Kendrick et P. K. Wang. « Raman magnetic resonance ». Physical Review Letters 58, no 4 (26 janvier 1987) : 345–48. http://dx.doi.org/10.1103/physrevlett.58.345.

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3

Robert, Bruno. « Resonance Raman spectroscopy ». Photosynthesis Research 101, no 2-3 (1 juillet 2009) : 147–55. http://dx.doi.org/10.1007/s11120-009-9440-4.

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4

Raser, Lydia N., Stephen V. Kolaczkowski et Therese M. Cotton. « RESONANCE RAMAN AND SURFACE-ENHANCED RESONANCE RAMAN SPECTROSCOPY OF HYPERICIN ». Photochemistry and Photobiology 56, no 2 (août 1992) : 157–62. http://dx.doi.org/10.1111/j.1751-1097.1992.tb02142.x.

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5

Frey, Gitti L., Reshef Tenne, Manyalibo J. Matthews, M. S. Dresselhaus et G. Dresselhaus. « Raman and resonance Raman investigation ofMoS2nanoparticles ». Physical Review B 60, no 4 (15 juillet 1999) : 2883–92. http://dx.doi.org/10.1103/physrevb.60.2883.

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6

Carey, Paul R. « Resonance Raman labels and Raman labels ». Journal of Raman Spectroscopy 29, no 10-11 (octobre 1998) : 861–68. http://dx.doi.org/10.1002/(sici)1097-4555(199810/11)29:10/11<861 ::aid-jrs323>3.0.co;2-b.

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LI, YUANZUO, XIUMING ZHAO, YONGQING LI, PENG SONG, YONG DING, LILI JI, XIAOGUANG LU et MAODU CHEN. « INTERMOLECULAR CHARGE TRANSFER ENHANCED RESONANCE RAMAN SCATTERING OF CHARGE TRANSFER COMPLEX ». Journal of Theoretical and Computational Chemistry 11, no 02 (avril 2012) : 273–82. http://dx.doi.org/10.1142/s0219633612500186.

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Intermolecular charge transfer (ICT) enhanced resonance Raman scattering of charge transfer complex is investigated experimentally and theoretically. The evidence for intermolecular charge transfer on resonance electronic transition is visualized with charge difference density. The resonant Raman spectra reveal that the intensity of Raman peaks are strongly enhanced on the order of 104, by comparing with the normal Raman scattering spectrum. ICT complexes can be used in fluorescence-, photoluminescence-, and electrochemistry-based techniques for sensing target molecules. These strong charge-transfer Raman peaks would enable discrimination of important target molecules from interferants that is normal Raman scattering for the isolated target molecules.
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8

An, Xuhong, Weiwei Zhao, Yuanfang Yu, Wenhui Wang, Ting Zheng, Yueying Cui, Xueyong Yuan, Junpeng Lu et Zhenhua Ni. « Resonance Raman scattering on graded-composition WxMo1–xS2 alloy with tunable excitons ». Applied Physics Letters 120, no 17 (25 avril 2022) : 172104. http://dx.doi.org/10.1063/5.0086278.

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Exciton–phonon interactions strongly affect photocarrier dynamics in two-dimensional materials. Here we report on resonant Raman experiments based on a graded composition W xMo1– xS2 alloy with tunable exciton energy without changing the energy of excitation laser. The intensities of the four most pronounced Raman features in the alloy are dramatically enhanced due to the resonance derived from the energy of B exciton shifting to the vicinity of the energy of excitation laser with an increase in W composition x. Specifically, through the resonance peak shift, absorption spectra and PL emission spectra under different excitation power, we conclude the resonance Raman is related to the exciton emission process. Our study extends the resonant Raman study of two-dimensional materials, which is expected to obtain deeper understanding of the excitonic effects in two-dimensional semiconductor materials.
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9

An, Xuhong, Weiwei Zhao, Yuanfang Yu, Wenhui Wang, Ting Zheng, Yueying Cui, Xueyong Yuan, Junpeng Lu et Zhenhua Ni. « Resonance Raman scattering on graded-composition WxMo1–xS2 alloy with tunable excitons ». Applied Physics Letters 120, no 17 (25 avril 2022) : 172104. http://dx.doi.org/10.1063/5.0086278.

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Exciton–phonon interactions strongly affect photocarrier dynamics in two-dimensional materials. Here we report on resonant Raman experiments based on a graded composition W xMo1– xS2 alloy with tunable exciton energy without changing the energy of excitation laser. The intensities of the four most pronounced Raman features in the alloy are dramatically enhanced due to the resonance derived from the energy of B exciton shifting to the vicinity of the energy of excitation laser with an increase in W composition x. Specifically, through the resonance peak shift, absorption spectra and PL emission spectra under different excitation power, we conclude the resonance Raman is related to the exciton emission process. Our study extends the resonant Raman study of two-dimensional materials, which is expected to obtain deeper understanding of the excitonic effects in two-dimensional semiconductor materials.
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10

Liu, Yanli, Xifeng Yang, Dunjun Chen, Hai Lu, Rong Zhang et Youdou Zheng. « Determination of Temperature-Dependent Stress State in Thin AlGaN Layer of AlGaN/GaN HEMT Heterostructures by Near-Resonant Raman Scattering ». Advances in Condensed Matter Physics 2015 (2015) : 1–6. http://dx.doi.org/10.1155/2015/918428.

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The temperature-dependent stress state in the AlGaN barrier layer of AlGaN/GaN heterostructure grown on sapphire substrate was investigated by ultraviolet (UV) near-resonant Raman scattering. Strong scattering peak resulting from the A1(LO) phonon mode of AlGaN is observed under near-resonance condition, which allows for the accurate measurement of Raman shifts with temperature. The temperature-dependent stress in the AlGaN layer determined by the resonance Raman spectra is consistent with the theoretical calculation result, taking lattice mismatch and thermal mismatch into account together. This good agreement indicates that the UV near-resonant Raman scattering can be a direct and effective method to characterize the stress state in thin AlGaN barrier layer of AlGaN/GaN HEMT heterostructures.
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11

Wright, John C., Peter C. Chen, James P. Hamilton, Arne Zilian et Mitchell J. Labuda. « Theoretical Foundations for a New Family of Infrared Four-Wave Mixing Spectroscopies ». Applied Spectroscopy 51, no 7 (juillet 1997) : 949–58. http://dx.doi.org/10.1366/0003702971941601.

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A new family of selective four-wave mixing methods, based on the establishment of vibrational nonlinear polarizations with multiple resonances, is proposed. This family includes double-infrared resonances, vibrationally enhanced Raman resonance, and vibrationally enhanced two-photon resonance. These methods are related to traditional Raman and infrared spectroscopy, but the methods are shown to have the capabilities for component and conformer selectivity, line-narrowing of inhomogeneously broadened vibrational transitions, and mode selection. The theoretical foundations for the methods are developed and directed to possible applications.
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12

Roubi, Larbi, et Cosmo Carlone. « Resonance Raman spectrum ofHfS2andZrS2 ». Physical Review B 37, no 12 (15 avril 1988) : 6808–12. http://dx.doi.org/10.1103/physrevb.37.6808.

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13

Spiro, Thomas G. « Resonance Raman Results : Retraction ». Science 278, no 5335 (3 octobre 1997) : 17.9–20. http://dx.doi.org/10.1126/science.278.5335.17-i.

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14

Spiro, T. G. « Resonance Raman Results : Retraction ». Science 278, no 5335 (3 octobre 1997) : 17h—20. http://dx.doi.org/10.1126/science.278.5335.17h.

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15

Wolverson, D., et S. V. Railson. « Automated resonance Raman spectroscopy ». Measurement Science and Technology 4, no 10 (1 octobre 1993) : 1080–84. http://dx.doi.org/10.1088/0957-0233/4/10/009.

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16

Vickers, Thomas J., Charles K. Mann, Jianxiong Zhu et Chan Kong Chong. « Quantitative Resonance Raman Spectroscopy ». Applied Spectroscopy Reviews 26, no 4 (décembre 1991) : 341–75. http://dx.doi.org/10.1080/05704929108050884.

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17

LIN, C. H., B. CHEN, C. T. CHIA et H. H. CHENG. « RESONANCE BAND IN Ge/Si SUPERLATTICE STUDIED BY RAMAN SCATTERING ». International Journal of Nanoscience 02, no 04n05 (août 2003) : 363–68. http://dx.doi.org/10.1142/s0219581x03001401.

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We have performed the low-frequency Raman measurement of MBE grown Ge/Si superlattice. Raman spectra were excited by He–Ne laser, and diode-pump YAG 532 nm laser, as well as several lines from Ar+ laser. Folded acoustic phonons of the Ge/Si superlattice were clearly found. The resonant effects were observed for the Ge/Si superlattices while the Raman spectra excited by the laser lines around 500 nm. A clearly resonance enhanced phonon signals are found for the spectrum excited by 532 nm laser line, and continuous emission can be clearly seen. By the continuous emission theory, we carried out a resonance band at 2.32 eV, which is closed to the E1 band of Germanium. Few weak resonant bands were also found near 2.32 eV, which may be related to confined band or the resonance band of interface layer between Si and Ge .
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18

Nikolenko, Andrii, Viktor Strelchuk, Bogdan Tsykaniuk, Dmytro Kysylychyn, Giulia Capuzzo et Alberta Bonanni. « Resonance Raman Spectroscopy of Mn-Mgk Cation Complexes in GaN ». Crystals 9, no 5 (4 mai 2019) : 235. http://dx.doi.org/10.3390/cryst9050235.

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Resonance Raman analysis is performed in order to gain insight into the nature of impurity-induced Raman features in GaN:(Mn,Mg) hosting Mn-Mgk cation complexes and representing a prospective strategic material for the realization of full-nitride photonic devices emitting in the infra-red. It is found that in contrast to the case of GaN:Mn, the resonance enhancement of Mn-induced modes at sub-band excitation in Mg co-doped samples is not observed at an excitation of 2.4 eV, but shifts to lower energies, an effect explained by a resonance process involving photoionization of a hole from the donor level of Mn to the valence band of GaN. Selective excitation within the resonance Raman conditions allows the structure of the main Mn-induced phonon band at ~670 cm−1 to be resolved into two distinct components, whose relative intensity varies with the Mg/Mn ratio and correlates with the concentration of different Mn-Mgk cation complexes. Moreover, from the relative intensity of the 2LO and 1LO Raman resonances at inter-band excitation energy, the Huang-Rhys parameter has been estimated and, consequently, the strength of the electron-phonon interaction, which is found to increase linearly with the Mg/Mn ratio. Selective temperature-dependent enhancement of the high-order multiphonon peaks is due to variation in resonance conditions of exciton-mediated outgoing resonance Raman scattering by detuning the band gap.
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19

Jian, Ye, et VanDorpe Pol. « Nanocrosses with Highly Tunable Double Resonances for Near-Infrared Surface-Enhanced Raman Scattering ». International Journal of Optics 2012 (2012) : 1–5. http://dx.doi.org/10.1155/2012/745982.

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We present asymmetric gold nanocrosses with highly tunable double resonances for the near-infrared (NIR) surface-enhanced Raman scattering (SERS), optimizing electric field enhancement at both the excitation and Stokes Raman wavelengths. The calculated largest SERS enhancement factor can reach a value as large as1.0×1010. We have found that the peak separation, the resonance position, and peak intensity ratio of the double-resonance gold nanocrosses can be tuned by changing the structural dimensions or the light polarization.
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20

Burns, Gary R., Joanne R. Rollo et Robin J. H. Clark. « Raman and resonance Raman studies of tetraphosphorus triselenide ». Inorganic Chemistry 25, no 8 (avril 1986) : 1145–49. http://dx.doi.org/10.1021/ic00228a017.

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21

López-Tocón, Isabel, Elizabeth Imbarack, Juan Soto, Santiago Sanchez-Cortes, Patricio Leyton et Juan Carlos Otero. « Intramolecular and Metal-to-Molecule Charge Transfer Electronic Resonances in the Surface-Enhanced Raman Scattering of 1,4-Bis((E)-2-(pyridin-4-yl)vinyl)naphthalene ». Molecules 24, no 24 (17 décembre 2019) : 4622. http://dx.doi.org/10.3390/molecules24244622.

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Electrochemical surface-enhanced Raman scattering (SERS) of the cruciform system 1,4-bis((E)-2-(pyridin-4-yl)vinyl)naphthalene (bpyvn) was recorded on nanostructured silver surfaces at different electrode potentials by using excitation laser lines of 785 and 514.5 nm. SERS relative intensities were analyzed on the basis of the resonance Raman vibronic theory with the help of DFT calculations. The comparison between the experimental and the computed resonance Raman spectra calculated for the first five electronic states of the Ag2-bpyvn surface complex model points out that the selective enhancement of the SERS band recorded at about 1600 cm−1, under 785 nm excitation, is due to a resonant Raman process involving a photoexcited metal-to-molecule charge transfer state of the complex, while the enhancement of the 1570 cm−1 band using 514.5 nm excitation is due to an intramolecular π→π* electronic transition localized in the naphthalenyl framework, resulting in a case of surface-enhanced resonance Raman spectrum (SERRS). Thus, the enhancement of the SERS bands of bpyvn is controlled by a general chemical enhancement mechanism in which different resonance processes of the overall electronic structure of the metal-molecule system are involved.
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22

Bell, Stephen, Joe A. Crayston, Trevor J. Dines et Saira B. Ellahi. « Resonance Raman, Surface-Enhanced Resonance Raman, Infrared, andab InitioVibrational Spectroscopic Study of Tetraazaannulenes ». Journal of Physical Chemistry 100, no 13 (janvier 1996) : 5252–60. http://dx.doi.org/10.1021/jp9530459.

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23

Merlin, Jean Claude, Emrys W. Thomas et Guislaine Petit. « Resonance Raman study of phenylhydrazonopropanedinitriles ». Canadian Journal of Chemistry 63, no 7 (1 juillet 1985) : 1840–44. http://dx.doi.org/10.1139/v85-305.

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Resonance Raman spectra and band assignments of some phenylhydrazonopropanedinitriles, including the 3-chloro and the 2-carboxy derivatives, in the 900–2300 cm−1 spectral range are presented and discussed. I5N and 2H isotopic shifts have been used to clarify the assignments, which have been made for both protonated and deprotonated forms of the compounds. The resonance Raman spectra of the protonated forms show strong coupling between NH deformation and hydrazone vibrations. This coupling is lost in the anionic forms, which are considered to have considerable carbanion character. By using the drastic changes between the resonance Raman spectra of protonated and deprotonated forms, the pKa value of the 2-carboxy derivative has been determined.
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24

Moldovan, Rebeca, Valentin Toma, Bogdan-Cezar Iacob, Rareș Ionuț Știufiuc et Ede Bodoki. « Off-Resonance Gold Nanobone Films at Liquid Interface for SERS Applications ». Sensors 22, no 1 (29 décembre 2021) : 236. http://dx.doi.org/10.3390/s22010236.

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Extensive effort and research are currently channeled towards the implementation of SERS (Surface Enhanced Raman Spectroscopy) as a standard analytical tool as it has undisputedly demonstrated a great potential for trace detection of various analytes. Novel and improved substrates are continuously reported in this regard. It is generally believed that plasmonic nanostructures with plasmon resonances close to the excitation wavelength (on-resonance) generate stronger SERS enhancements, but this finding is still under debate. In the current paper, we compared off-resonance gold nanobones (GNBs) with on-resonance GNBs and gold nanorods (GNRs) in both colloidal dispersion and as close-packed films self-assembled at liquid-liquid interface. Rhodamine 6G (R6G) was used as a Raman reporter in order to evaluate SERS performances. A 17-, 18-, and 55-fold increase in the Raman signal was observed for nanostructures (off-resonance GNBs, on-resonance GNBs, and on-resonance GNRs, respectively) assembled at liquid-liquid interface compared to the same nanostructures in colloidal dispersion. SERS performances of off-resonance GNBs were superior to on-resonance nanostructures in both cases. Furthermore, when off-resonance GNBs were assembled at the liquid interface, a relative standard deviation of 4.56% of the recorded signal intensity and a limit of detection (LOD) of 5 × 10−9 M could be obtained for R6G, rendering this substrate suitable for analytical applications.
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25

JACULBIA, Rafael B., Hiroshi IMADA, Norihiko HAYAZAWA et Yousoo KIM. « Single-Molecule Resonance Raman Spectroscopy ». Vacuum and Surface Science 64, no 1 (10 janvier 2021) : 34–39. http://dx.doi.org/10.1380/vss.64.34.

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26

Kumauchi, M., J. Sasaki, F. Tokunaga, M. Unno et S. Yamauchi. « Resonance Raman spectra of PYP ». Seibutsu Butsuri 39, supplement (1999) : S70. http://dx.doi.org/10.2142/biophys.39.s70_3.

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27

Verma, A. L., G. S. S. Saini et N. K. Chaudhury. « Resonance Raman studies of metalloporphyrins ». Proceedings / Indian Academy of Sciences 102, no 3 (juin 1990) : 291–306. http://dx.doi.org/10.1007/bf02841943.

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28

Babcock, G. T. « Resonance Raman microspectroscopy in biology ». Biophysical Journal 67, no 1 (juillet 1994) : 5–6. http://dx.doi.org/10.1016/s0006-3495(94)80449-7.

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29

McKee, Kristopher J., Matthew W. Meyer et Emily A. Smith. « Plasmon Waveguide Resonance Raman Spectroscopy ». Analytical Chemistry 84, no 21 (22 octobre 2012) : 9049–55. http://dx.doi.org/10.1021/ac3013972.

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Manthey, J. A., N. J. Boldt, D. F. Bocian et S. I. Chan. « Resonance Raman studies of lactoperoxidase. » Journal of Biological Chemistry 261, no 15 (mai 1986) : 6734–41. http://dx.doi.org/10.1016/s0021-9258(19)62678-5.

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31

Matus, M., S. Balgavy, H. Kuzmany et W. Krätschmer. « Resonance Raman spectroscopy of Buckminsterfullerene ». Physica C : Superconductivity 185-189 (décembre 1991) : 423–24. http://dx.doi.org/10.1016/0921-4534(91)92014-3.

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32

Majoube, M., Ph Millié, L. Chinsky, P. Y. Turpin et G. Vergoten. « Resonance Raman spectra for purine ». Journal of Molecular Structure 355, no 2 (septembre 1995) : 147–58. http://dx.doi.org/10.1016/0022-2860(95)08896-4.

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33

JACULBIA, Rafael B., Hiroshi IMADA, Norihiko HAYAZAWA et Yousoo KIM. « Single-Molecule Resonance Raman Spectroscopy ». Vacuum and Surface Science 64, no 1 (10 janvier 2021) : 34–39. http://dx.doi.org/10.1380/vss.64.34.

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34

Tejedor, C., J. M. Calleja, F. Meseguer, E. E. Mendez, C. A. Chang et L. Esaki. « Raman resonance onE1edges in superlattices ». Physical Review B 32, no 8 (15 octobre 1985) : 5303–11. http://dx.doi.org/10.1103/physrevb.32.5303.

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35

Myers, Anne B. « ‘Time-Dependent’ Resonance Raman Theory ». Journal of Raman Spectroscopy 28, no 6 (juin 1997) : 389–401. http://dx.doi.org/10.1002/(sici)1097-4555(199706)28:6<389 ::aid-jrs128>3.0.co;2-m.

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36

Giner, C. Trallero, et O. Sotolongo Costa. « One-Phonon Resonance Raman Scattering ». physica status solidi (b) 127, no 1 (1 janvier 1985) : 121–30. http://dx.doi.org/10.1002/pssb.2221270111.

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37

Efremov, Evtim V., Freek Ariese et Cees Gooijer. « Achievements in resonance Raman spectroscopy ». Analytica Chimica Acta 606, no 2 (janvier 2008) : 119–34. http://dx.doi.org/10.1016/j.aca.2007.11.006.

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38

Clarke, Richard H., et Sookhee Ha. « Resonance Raman spectroscopy of proflavin ». Spectrochimica Acta Part A : Molecular Spectroscopy 41, no 12 (janvier 1985) : 1381–86. http://dx.doi.org/10.1016/0584-8539(85)80190-2.

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KOYAMA, Y. « ChemInform Abstract : Resonance Raman Spectroscopy ». ChemInform 26, no 32 (17 août 2010) : no. http://dx.doi.org/10.1002/chin.199532316.

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40

Syrbu, N. N., A. V. Tiron, V. V. Zalamai et N. P. Bejan. « Resonance Raman Scattering in TlGaSe2 Crystals ». Advances in Condensed Matter Physics 2017 (2017) : 1–5. http://dx.doi.org/10.1155/2017/5787821.

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The resonance Raman scattering for geometries Y(YX)Z and Y(ZX)Z at temperature 10 K and infrared reflection spectra in E∥a and E∥b polarizations at 300 K were investigated. The number of Aa (Ba) and Au (Bu) symmetry vibrational modes observed experimentally and calculated theoretically agree better in this case than when TlGa2Se4 crystals belong to D2h symmetry group. The emission of resonance Raman scattering and excitonic levels luminescence spectra overlap. The lines in resonance Raman spectra were identified as a combination of optical phonons in Brillouin zone center.
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41

Johannessen, Christian, Peter C. White et Salim Abdali. « Resonance Raman Optical Activity and Surface Enhanced Resonance Raman Optical Activity Analysis of Cytochromec ». Journal of Physical Chemistry A 111, no 32 (août 2007) : 7771–76. http://dx.doi.org/10.1021/jp0705267.

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42

Bae, Chang Hyun, Si Won Song, Soo Yeong Lim, Seonyoung Yoo, Chang Sug Lee, Chan Ryang Park, Gyuho Kim et Hyung Min Kim. « Multicolor-Raman analysis of Korean paintworks : emission-like Raman collection efficiency ». Analyst 146, no 7 (2021) : 2374–82. http://dx.doi.org/10.1039/d0an02363a.

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It has been reported that the scattering cross-sections of resonance Raman spectra strongly depend on the resonance between the laser's excitation energy and the electronic absorption band of pigments in solution.
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43

Liu, C. H., Y. Zhou, Y. Sun, J. Y. Li, L. X. Zhou, S. Boydston-White, V. Masilamani, K. Zhu, Yang Pu et R. R. Alfano. « Resonance Raman and Raman Spectroscopy for Breast Cancer Detection ». Technology in Cancer Research & ; Treatment 12, no 4 (août 2013) : 371–82. http://dx.doi.org/10.7785/tcrt.2012.500325.

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44

Barron, L. D. « Magnetic Raman optical activity and Raman electron paramagnetic resonance ». Pure and Applied Chemistry 57, no 2 (1 janvier 1985) : 215–23. http://dx.doi.org/10.1351/pac198557020215.

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45

Bonang, Christopher C., et Stewart M. Cameron. « Resonance Raman and hyper-Raman scattering from monosubstituted benzenes ». Chemical Physics Letters 187, no 6 (décembre 1991) : 619–22. http://dx.doi.org/10.1016/0009-2614(91)90446-g.

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46

Curran, S. A., J. A. Talla, D. Zhang et D. L. Carroll. « Defect-induced vibrational response of multi-walled carbon nanotubes using resonance Raman spectroscopy ». Journal of Materials Research 20, no 12 (1 décembre 2005) : 3368–73. http://dx.doi.org/10.1557/jmr.2005.0414.

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We systematically introduced defects onto the body of multi-walled carbon nanotubes through an acid treatment, and the evolution of these defects was examined by Raman spectroscopy using different excitation wavelengths. The D and D′ modes are most prominent and responsive to defect formation caused by acid treatment and exhibit dispersive behavior upon changing the excitation wavelengths as expected from the double resonance Raman (DRR) mechanism. Several weaker Raman resonances including D″ and L1 (L2) + D′ modes were also observed at the lower excitation wavelengths (633 and 785 nm). In addition, specific structural defects including the typical pentagon-heptagon structure (Stone–Wales defects) were identified by Raman spectroscopy. In a closer analysis we also observed Haeckelite structures, specifically Ag mode response in R5,7 and O5,6,7.
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47

SCHWEITZER-STENNER, REINHARD. « Polarized resonance Raman dispersion spectroscopy on metalporphyrins ». Journal of Porphyrins and Phthalocyanines 05, no 03 (mars 2001) : 198–224. http://dx.doi.org/10.1002/jpp.307.

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Resonance Raman spectroscopy is an ideal tool to investigate the structural properties of chromophores embedded in complex (biological) environments. This holds particularly for metalporphyrins which serve as prosthetic group in various proteins. Resonance Raman dispersion spectroscopy involves the measurement of resonance excitation and depolarization ratios of a large number of Raman lines at various excitation energies covering the spectral region of the chromophore's optical absorption bands. Thus, one obtains resonance excitation profiles and the depolarization ratio dispersion of these bands. While the former contains information about the structure of excited electronic states involved in the Raman scattering process, the latter reflects asymmetric perturbations which lower the porphyrin macrocycle symmetry from ideal D4h. The article introduces and compares different quantum mechanical approaches designed to quantitatively analyze both resonance excitation and the relationship between symmetry lowering and depolarization ratio dispersion.
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48

Buntinx, G., et O. Poizat. « Time-Resolved Resonance Raman Spectroscopy of Photochemical Reactive Intermediates : Radical Cation of Fluorene and Triplet State of Fluorene, Dibenzofuran and Dibenzothiophen ». Laser Chemistry 10, no 5-6 (1 janvier 1990) : 333–47. http://dx.doi.org/10.1155/1990/28350.

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The time-resolved Raman spectra of the first triplet state–in resonance with the Tn←T1 absorption at 370 nm–and of the radical cation transient–in resonance with the R+⋅∗←R+⋅ absorptions at 370 nm and in the 560-600 nm range-are reported for fluorene. The triplet state Raman spectra of dibenzofuran and dibenzothiophen are also given. The vibrational assignments, resonance Raman activity and intensity enhancement effects are studied. On this basis, the structures and electronic configurations of the triplet state and radical cation transients and the nature of the resonant Tn←T1 and R+⋅∗←R+⋅ transitions are discussed. It turns out from this investigation that the title molecules present close analogies with biphenyl. The insertion of a methylene group or a heteroatom does not disturb markedly the electronic properties of the ground state, the first triplet state and the radical cation transient of biphenyl.
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49

Rush, Thomas S., Ranjit Kumble et Thomas G. Spiro. « Modeling the Transient Changes in the Soret-Resonant Raman Intensities of Hemoglobin During The R→ T Transition ». Laser Chemistry 19, no 1-4 (1 janvier 1999) : 229–31. http://dx.doi.org/10.1155/1999/70916.

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We have performed resonance Raman (RR) intensity calculations of the Soret-resonant Raman spectra of Ni and Zn Porphine to investigate observed core size intensity differences in the time-resolved Soret-resonant Raman (RR) spectra of hemoglobin. It was found that the metalloporphine intensities mainly derive from the expansion of the Cα—Cm and Cβ—Cβ bonds in the excited state, and that the observed differences are mainly due to the larger core-sized heme having a decreased Cα—Cm force constant and larger excited state porphyrin ring expansion.
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50

LEE, HYUN C. « RESONANT RAMAN SCATTERING OF INTERACTING TWO-CHANNEL QUANTUM WIRES ». International Journal of Modern Physics B 15, no 22 (10 septembre 2001) : 3031–38. http://dx.doi.org/10.1142/s0217979201007221.

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Resonant Raman scattering of degenerate interacting two-channel quantum wire is studied. All collective excitations of two-channel quantum wire are shown to give rise to peaks in the polarized Raman spectra near resonance. If there exist certain symmetries among interactions, a resonant peak can also appear in the depolarized Raman spectra, in contrast to the single-channel case studied by Sassetti and Kramer. We also calculate the explicit form of the scattering cross-section away from the peaks. The above features may be experimentally verified in armchair carbon nanotube systems.
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