Vibrational Relaxation in Neat Crystals of Naphthalene by Picosecond CARS

Ben H. Hesp, Douwe A. Wiersma

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Abstract

Picosecond delayed CARS experiments on totally symmetric modes in naphthalene at 1.5 K are reported. The Raman lineshape of the vibrational excitons is lorentzian and vibrational relaxation can be surprisingly slow. The Raman lineshape of the Ag exciton level of the 766 cm-1 vibrational mode reveals that the low-temperature lorentzian lineshape occurs by motional narrowing. At higher temperature the exciton is trapped by interaction with lattice phonons.
Original languageEnglish
Pages (from-to)423-426
Number of pages4
JournalChemical Physics Letters
Volume75
Issue number3
DOIs
Publication statusPublished - 1980

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