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Vibrational relaxation in neat crystals of naphthalene by picosecond cars

โœ Scribed by Ben H. Hesp; Douwe A. Wiersma

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
352 KB
Volume
75
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

Picosecond delayed CARS expenments on totally symmetric modes in naphthalene at 1.5 K are reported. The Raman hneshape of the vlbratlonal excltons 1s lorentzm and viirahonal relaxation can be surpnsingly slow. The Raman lineshape of the Ag exclton level of the 766 cm-' vlbrahonal mode reveals that the low-temperature lorentzian lmeshape occurs by mouonal narrowmg At hugher temperature the excrton LS trapped by mterachon with lattice phonons.

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Temperature-dependent vibrational relaxa
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Temperature-dependent dephasing of 511, 766 and 1385 cm-' modes in the mixed crystals of naphthalene and perdeuteronaphthalene at various isotopic levels have been studied by picosecond CARS in the region of 6-130 K. In general, adding the isotope shows a significant effect on the low-temperature de

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Vibrational relaxation is measured in amino acid crystals at various temperatures by picosecond CARS spectroscopy. Low-frequency (40-l 25 cm-') torsional modes, librons, have liietimes which can exceed 4 ns. The decrease in lifetime with libron frequency and with temperature is determined primarily