Relaxation within and from the (31/214151) and (3141/214251) Fermi dyads in acetylene: Vibrational energy transfer in collisions with C2H2, N2 and H2

Sarah Henton, Meez Islam, Ian W. M. Smith

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Abstract

Infrared-ultraviolet double resonance (IRUVDR) experiments have been performed on samples of pure C2H2 and on C2H2 diluted in N2 and H2. Pulses of tunable IR radiation from an optical parametric oscillator (OPO) excited molecules of C2H2 to one component state of one of two Fermi dyads in the X̃ 1Σg + electronic ground state, i.e. (31/214151)II or (3141/214251) II, and tunable UV laser radiation was used to observe the evolution of population either in that state or in the other component state of the same Fermi dyad. In this paper.J rate coefficients are reported for two kinds of processes: (a) vibration-to-vibration (V-V) transfer between the two component states of the same Fermi dyad induced by collisions with C2H2, N2 and H2, and (b) vibrational relaxation from the coupled pair of Fermi dyad states in collisions with the same gases. In addition, populations have been observed in the (4251), (4151) and (42) states of C2H2 during relaxation from the (3141/214251) dyad and rate coefficients for self-relaxation from the first two of these states have been derived. The results for both V-V intradyad transfer and for vibrational relaxation are discussed in terms of the vibrational matrix elements for such collision-induced transitions and differences in the mixing of the zero order states in the Fermi dyads.

Original languageEnglish
Pages (from-to)3207-3217
JournalJournal of the Chemical Society - Faraday Transactions
Volume94
Issue number21
DOIs
Publication statusPublished - 7 Nov 1998

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Acetylene
acetylene
Energy transfer
energy transfer
Infrared radiation
Optical parametric oscillators
vibration
collisions
Laser radiation
molecular relaxation
Ultraviolet radiation
Ground state
Laser pulses
Gases
Molecules
coefficients
tunable lasers
parametric amplifiers
ultraviolet lasers
Experiments

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title = "Relaxation within and from the (31/214151) and (3141/214251) Fermi dyads in acetylene: Vibrational energy transfer in collisions with C2H2, N2 and H2",
abstract = "Infrared-ultraviolet double resonance (IRUVDR) experiments have been performed on samples of pure C2H2 and on C2H2 diluted in N2 and H2. Pulses of tunable IR radiation from an optical parametric oscillator (OPO) excited molecules of C2H2 to one component state of one of two Fermi dyads in the X̃ 1Σg + electronic ground state, i.e. (31/214151)II or (3141/214251) II, and tunable UV laser radiation was used to observe the evolution of population either in that state or in the other component state of the same Fermi dyad. In this paper.J rate coefficients are reported for two kinds of processes: (a) vibration-to-vibration (V-V) transfer between the two component states of the same Fermi dyad induced by collisions with C2H2, N2 and H2, and (b) vibrational relaxation from the coupled pair of Fermi dyad states in collisions with the same gases. In addition, populations have been observed in the (4251), (4151) and (42) states of C2H2 during relaxation from the (3141/214251) dyad and rate coefficients for self-relaxation from the first two of these states have been derived. The results for both V-V intradyad transfer and for vibrational relaxation are discussed in terms of the vibrational matrix elements for such collision-induced transitions and differences in the mixing of the zero order states in the Fermi dyads.",
author = "Sarah Henton and Meez Islam and Smith, {Ian W. M.}",
note = "Author can archive publisher's version/PDF.",
year = "1998",
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T1 - Relaxation within and from the (31/214151) and (3141/214251) Fermi dyads in acetylene

T2 - Vibrational energy transfer in collisions with C2H2, N2 and H2

AU - Henton, Sarah

AU - Islam, Meez

AU - Smith, Ian W. M.

N1 - Author can archive publisher's version/PDF.

PY - 1998/11/7

Y1 - 1998/11/7

N2 - Infrared-ultraviolet double resonance (IRUVDR) experiments have been performed on samples of pure C2H2 and on C2H2 diluted in N2 and H2. Pulses of tunable IR radiation from an optical parametric oscillator (OPO) excited molecules of C2H2 to one component state of one of two Fermi dyads in the X̃ 1Σg + electronic ground state, i.e. (31/214151)II or (3141/214251) II, and tunable UV laser radiation was used to observe the evolution of population either in that state or in the other component state of the same Fermi dyad. In this paper.J rate coefficients are reported for two kinds of processes: (a) vibration-to-vibration (V-V) transfer between the two component states of the same Fermi dyad induced by collisions with C2H2, N2 and H2, and (b) vibrational relaxation from the coupled pair of Fermi dyad states in collisions with the same gases. In addition, populations have been observed in the (4251), (4151) and (42) states of C2H2 during relaxation from the (3141/214251) dyad and rate coefficients for self-relaxation from the first two of these states have been derived. The results for both V-V intradyad transfer and for vibrational relaxation are discussed in terms of the vibrational matrix elements for such collision-induced transitions and differences in the mixing of the zero order states in the Fermi dyads.

AB - Infrared-ultraviolet double resonance (IRUVDR) experiments have been performed on samples of pure C2H2 and on C2H2 diluted in N2 and H2. Pulses of tunable IR radiation from an optical parametric oscillator (OPO) excited molecules of C2H2 to one component state of one of two Fermi dyads in the X̃ 1Σg + electronic ground state, i.e. (31/214151)II or (3141/214251) II, and tunable UV laser radiation was used to observe the evolution of population either in that state or in the other component state of the same Fermi dyad. In this paper.J rate coefficients are reported for two kinds of processes: (a) vibration-to-vibration (V-V) transfer between the two component states of the same Fermi dyad induced by collisions with C2H2, N2 and H2, and (b) vibrational relaxation from the coupled pair of Fermi dyad states in collisions with the same gases. In addition, populations have been observed in the (4251), (4151) and (42) states of C2H2 during relaxation from the (3141/214251) dyad and rate coefficients for self-relaxation from the first two of these states have been derived. The results for both V-V intradyad transfer and for vibrational relaxation are discussed in terms of the vibrational matrix elements for such collision-induced transitions and differences in the mixing of the zero order states in the Fermi dyads.

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