# LIFETIMES AND MAGNETIC MOMENTS OF PERTURBED ROTATIONAL LEVELS OF $A ^{1}\Sigma^{+} BaO$

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 Title: LIFETIMES AND MAGNETIC MOMENTS OF PERTURBED ROTATIONAL LEVELS OF $A ^{1}\Sigma^{+} BaO$ Creators: Darrah, S. D.; Silvers, S. J. Issue Date: 1984 Publisher: Ohio State University Abstract: Perturbed, single rotational levels of A $A ^{1}\Sigma^{+} BaO$ have been excited by a pulsed, tunable dye laser and their lifetimes, fluorescence quenching constants and magnetic moments have been measured. Lifetimes are lengthened and a magnetic moment of electronic origin is observed principally because of interaction and mixing with components of the $b ^{3}\Pi$ state. The perturbation of the $v = 3$ vibrational level is strongest at $J = 19$ where both a main and an extra line are seen. The lifetime of the $J = 19$ main level is $322 \pm 11$ nsec and that of the extra level is $672 \pm 29$ nsec. These compare with an unperturbed $v = 3$ lifetime of $279 \pm 8$ nsec. The $v = 2$ level is most strongly perturbed at $J = 28$. The fluorescence quenching constant for this level is twice as large as that for unperturbed $v = 2$ rotational levels; its g - factor, which is caused by the perturbation, was determined by the Hanle effect to be $g_{J=28} = 0.95 \pm 0.15 \times 10^{-3}$. Measured lifetimes and moments are compared to values calculated from results of the deperturbation analysis of Gottscho, Koffend and $Field.^{1}$ Description: $^{1}$ R.G. Gottscho, J.B. Koffend and R.W. Field, J. Mol. Spectrosc. 82, 310 (1980). Author Institution: Department of Chemistry, Virginia Commonwealth University URI: http://hdl.handle.net/1811/16784 Other Identifiers: 1984-TC-4