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Title: The initial vibrational state distribution of HCN {ital {tilde X}} {sup 1}{Sigma}{sup +}({ital v}{sub 1},0,{ital v}{sub 3}) from the reaction CN({sup 2}{Sigma}{sup +})+C{sub 2}H{sub 6}{r_arrow}HCN+C{sub 2}H{sub 5}

The reaction of the cyano radical (CN) with ethane was studied using time-resolved infrared absorption spectroscopy to monitor individual rovibrational states of the HCN product. A method is described that can be used to determine the initial vibrational state distribution at pressures of several Torr. This technique was applied to the title reaction to determine that the vibrational states of HCN({ital v}{sub 1},0,{ital v}{sub 3}), where {ital v}{sub 1}, {ital v}{sub 3}=0, 1, and 2, were {ital not} directly populated in the title reaction to any significant extent. The initial vibrational energy content of the CN radical was also varied but did not influence the initial population in the HCN vibrational levels probed in this experiment. The time dependence of HCN({ital v}{sub 1},0,{ital v}{sub 3}) was followed and interpreted in terms of bimolecular rate constants for vibrational relaxation with ethane. The title reaction is mode specific in its energy disposal in that at least every HCN product appears to have at least one quantum of bending excitation, likely in combination with stretching vibrations.
Authors:
; ;  [1]
  1. Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
46333
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 102; Journal Issue: 20; Other Information: PBD: 22 May 1995
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; ETHANE; MOLECULE COLLISIONS; CYANOGEN; HYDROCYANIC ACID; VIBRATIONAL STATES; INFRARED SPECTRA; TIME DEPENDENCE; RELAXATION; BENDING; EXCITATION; DISTRIBUTION; MOLECULES; RADICALS