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Rotational relaxation in the H2CO A-tilde 1A2 state by transient gain spectroscopy

J. Chem. Phys. 82, 5755 (1985); doi:10.1063/1.448564

Issue Date: 15 June 1985

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P. H. Vaccaro, R. L. Redington, J. Schmidt, James L. Kinsey, and R. W. Field
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
A new, pulsed pump–cw probe technique, transient gain spectroscopy, has been used to measure the zero pressure lifetime (279±10 ns) and self-collision depopulation rate (110.5±3.1 µs−1 Torr−1) for the H2CO A-tilde 1A2 41 JKa,Kc =132,12 level as well as the 122,11<--132,12(31±8 µs−1 Torr−1) and 142,13<--132,12(40±6 µs−1 Torr−1) rotational relaxation rates. The dominant collisional process is rotational energy transfer, which, for the H2CO(A-tilde)+H2CO(X-tilde) process examined here, appears to follow dipole–dipole scaling and propensity rules. The 110.5 µs−1 Torr−1 depopulation rate in the A-tilde state agrees with the vibrationless X-tilde state rate obtained from microwave power broadening scaled by the 1.46 D/2.33 D electric dipole moment ratio. The two strongest a-dipole rotational state-to-state rates account for more than 50% of the total removal rate from H2CO A-tilde 41 132,12. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 7 March 1985; accepted 8 April 1985
Permalink: http://link.aip.org/link/?JCPSA6/82/5755/1
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KEYWORDS and PACS

Keywords
PACS
  • 33.50.Dq
    Molecular spectra and interactions of molecules with photons Fluorescence and phosphorescence; radiationless transitions (intersystem crossing, internal conversion) Fluorescence and phosphorescence spectra
  • 33.10.Ev
    Molecular spectra and interactions of molecules with photons Calculation of molecular spectra Rotational analysis
  • YEAR: 1985

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (16)
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