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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2011, Volume 93, Issue 3, Pages 139–143
(Mi jetpl1823)
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This article is cited in 6 scientific papers (total in 6 papers)
ATOMS, SPECTRA, RADIATIONS
Extremely slow intramolecular vibrational redistribution: Direct observation by time-resolved Raman spectroscopy in trifluoropropyne
A. L. Malinovskya, A. A. Makarovba, E. A. Ryabova a Institute of Spectroscopy RAS, 142190 Troitsk, Moscow Region, Russia
b Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Moscow Region, Russia
Abstract:
We have studied the dynamics of intramolecular vibrational redistribution (IVR) from the initially excited mode $\nu_1\approx3330$ cm$^{-1}$ (acetyleneṭype H–C bond) in H–C$\equiv$C–CF$_3$ molecules in the gaseous phase by means of anti-Stokes spontaneous Raman scattering. The time constant of this process is estimated as 2.3 ns – this is the slowest IVR time reported so far for the room-temperature gases. It is suggested that so long IVR time with respect to the other propyne derivatives can be explained by a larger defect, in this case, of the Fermi resonance of $\nu_1$ with $\nu_2+2\nu_7$ – the most probable doorway state leading to IVR from $\nu_1$ to the bath of all vibrational–rotational states with the close energies. In addition, it is shown that the observed dynamics is in agreement with a theoretical model assuming strong vibrational–rotational mixing.
Received: 21.12.2010
Citation:
A. L. Malinovsky, A. A. Makarov, E. A. Ryabov, “Extremely slow intramolecular vibrational redistribution: Direct observation by time-resolved Raman spectroscopy in trifluoropropyne”, Pis'ma v Zh. Èksper. Teoret. Fiz., 93:3 (2011), 139–143; JETP Letters, 93:3 (2011), 124–128
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https://www.mathnet.ru/eng/jetpl1823 https://www.mathnet.ru/eng/jetpl/v93/i3/p139
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Abstract page: | 224 | Full-text PDF : | 54 | References: | 35 |
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