Photodissociation laser isotope effects

Marked differences in the laser action (1.315 μm) observed following the flash photolysis of CD 3I and CH 3I are reported (substantially greater outputs are observed with CD 3I). These differences result from the significantly smaller cross section for quenching of I(5 2P 1 2 ) by CD 3I, relative to...

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Bibliographic Details
Published in:Chemical physics letters 1975-02, Vol.30 (3), p.398-402
Main Authors: Butcher, R.J., Donovan, R.J., Fotakis, C., Fernie, D., Rae, A.G.A.
Format: Article
Language:English
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Summary:Marked differences in the laser action (1.315 μm) observed following the flash photolysis of CD 3I and CH 3I are reported (substantially greater outputs are observed with CD 3I). These differences result from the significantly smaller cross section for quenching of I(5 2P 1 2 ) by CD 3I, relative to that for CH 3I. Absolute values for the quenching cross sections have been determined using time resolved atomic absorption spectrophotometry. These data were employed in a computer simulated model which satisfactorily reproduced the light output from CH 3I, CD 3I and CF 3I photochemical laser systems. It is concluded that isotopic substitution can markedly influence the cross section for quenching of an excited state and thus influence partitioning between the various available channels.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(75)80016-9