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Collisional relaxation of H2CO (A-tilde 1A2, v4=1, JKa ,Kc=132,12) by He, Ar, Xe, and N2

J. Chem. Phys. 91, 1008 (1989); doi:10.1063/1.457224

Issue Date: 15 July 1989

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F. Temps, S. Halle, P. H. Vaccaro, R. W. Field, and J. L. Kinsey
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
The collision-induced deactivation of H2CO in a specific rotational level in its first electronically excited singlet state, A-tilde 1A2, v4=1, JKa,Kc=132,12, has been investigated with a series of colliders, M=He, Ar, Xe, and N2. The target level was populated via the transition A-tilde <--X-tilde, 4<sup>1</sup><sub>0</sub>, 132,12<--133,11 using a pulsed dye laser. The subsequent relaxation was monitored using the technique of transient gain spectroscopy (TGS) via the transition A-tilde -->X-tilde, 2<sup>0</sup><sub>1</sub>3<sup>0</sup><sub>1</sub>4<sup>1</sup><sub>4</sub>, 132,12-->131,13, which coincides with the line of an Ar+ laser at lambda=488.0 nm. The experiments yielded the overall collisional depopulation rate constants (velocity averaged cross sections) for He, Ar, Xe, and N2, respectively: (5.25±0.20)×10−10 cm3/molecule s (39 Å2), (5.22±0.18)×10−10 cm3/molecule s (86 Å2), (5.37±0.29)×10−10 cm3/molecule s (106 Å2), (8.25±0.29)×10−10 cm3/molecule s (125 Å2), where the uncertainties correspond to the 2sigma standard deviations. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 6 March 1989; accepted 4 April 1989
Permalink: http://link.aip.org/link/?JCPSA6/91/1008/1
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KEYWORDS and PACS

Keywords
PACS
  • 34.50.Gb
    Atomic and molecular collision processes and interactions Inelastic scattering of atoms and molecules Electronic excitation and ionization of molecules; intermediate molecular states (including lifetimes, state mixing, etc.)
  • 82.20.Rp
    Physical chemistry Chemical kinetics Energy distribution and transfer; relaxation
  • YEAR: 1988-89

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
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REFERENCES (23)
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