## DOPPLER LIMITED LASER SPECTROSCOPY OF ELECTRONIC TRANSITIONS IN SnO

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Ohio State University##### Abstract:

Laser induced fluorescence with narrow-hand excitation and tine resolution has been used to investigate the quantum-resolved dynamics of excited states of $^{120}SnO$. Transitions to both the $A1_\Pi$ and $b^{`3} \Pi(1)$ excited states wore observed. The 1-0 band of SnO A-X is unperturbed, whilst the v `=3 and v `=4 levels of $A^{1} \Pi $ are perturbed. The v `=3 level of $A^{1} \Pi$ and the v `=13 level of b `3 $\Pi(1)$ show a strong mutual perturbation. The v `=4 level of $A^{1} \Pi$ is somewhat more weakly perturbed by a $^{1}\Delta $ (1)or $^{3}\Pi (2)$ state, Analysis of the spectra of the A-X and b `-X transitions is described. Lifetimes ($\zeta _{0}$) of selected ro-vibrational states of the $A ^{1}\Pi$ and $b ` ^{3}\Pi (1)$ manifolds, and quenching rate constants with $O_{2} (K_{i})$, are reported for the first time as follows; \begin{eqnarray*} A^{1}\Pi , v`=1 :- \zeta _{0} = (160+20)ns; k_{m} = (2.2 \pm 0.6) \times 10^{-10} \mbox{cm}^{3} s^{-1}\\ v` =3 :- \zeta _{0} = (140 \pm 10)ns; k_{m} = (6.9 \pm 0.6) \times 10^{-10} \mbox{cm}^{3} s^{-1}\\ v` =4 :- \zeta _{0} = (130 \pm 20)ns; k_{m} \geq 1.4 \times 10^{-10} \mbox{cm}^{3} s^{-1}\\ b^{`3}\Pi(1), V` =14:- \zeta _{0} = (580 \pm 30)ns; k_{m} =(3.6 \pm 1.3) \times 10^{-10} \mbox{cm}^{3} s^{-1} \end{eqnarray*}""

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