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Vibrational state-to-state resolution in the collisional relaxation of a highly vibrationally excited polyatomic: HCN

✍ Scribed by Ruiping Huang; Jisen Wu; Meng-Xiong Gong; Alain Saury; Edwin Carrasquillo M

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 618 KB
Volume: 216
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)e1233-7

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✦ Synopsis

The measurement of vibrational state-to-state population transfer for a highly vibrationally excited polyatomic molecule (cym* 9600 cm-i) is reported. This work combines direct overtone vibration excitation with LIF via the A 'A" state of HCN to obtain the rate k= (2.4kO.3) x 10-i* cm' molecule-' s-i for population transfer from (0, O", 3) to ( 3,O",1). This channel accounts for 17% of the total depopulation of (0, O", 3) indicating that intramolecular V-V transfer is important in the selfrelaxation of HCN. We show that resonance-enhanced relaxation can account for the high efficiency of this channel and demonstrate that long-range dipole-dipole interactions can lead to enhanced relaxation between mixed states when coupled by Fermi resonance.

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