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Collision Relaxation of Highly Vibrationally Excited SO 2 by CO in A Supersonic Beam
Author(s) -
Zhang Min,
Ma JianQiang,
Han Jun,
Dai HaiLung
Publication year - 2006
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200600003
Subject(s) - chemistry , excited state , dephasing , supersonic speed , atomic physics , relaxation (psychology) , collision , molecular beam , cross section (physics) , kinetic energy , ground state , molecule , physics , condensed matter physics , psychology , social psychology , computer security , organic chemistry , quantum mechanics , computer science , thermodynamics
Collision relaxation cross sections of a single , highly vibrationally excited level in the ground electronic state of SO 2 at 44877.52 cm −1 above the zero‐point by the collision partner CO has been measured in a supersonic expansion using the kinetic quantum beat spectroscopic technique. The depopulation cross section at 14.5 K for this SO 2 * ‐CO system has been determined to be 75 Å 2 , while the dephasing cross section is 22 Å 2 . Comparison with previously measured cross sections for the SO 2 * ‐SO 2 , SO 2 * ‐inert gases systems at room temperature using a similar spectroscopic approach reveals both the long range interaction and repulsive force contributions to the relaxation cross sections of highly vibrationally excited molecules.