RADIATIVE QUENCHING OF SELECTIVELY EXCITES VIBRONIC LEVELS IN THE $A^{2}\pi_{i}$ STATE OF $CO^{*} $
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Date
1981
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Ohio State University
Abstract
A pulsed, tunable dye laser is used to selectively excite various vibrational levels of the $A^{2}\pi_{i}$ state in $^{12}CO^{+} ~and~ ^{13}CO^{+}$ which are formed by Penning ionization via helium metastable atoms. The laser induced fluorescence from these level is recorded as a function of time and pressure. Previous work $^{1} on^{12}CO^{+}$ indicates that the radiative quenching process for the $A^{2}\pi\i$ state occurs via high lying vibrational levels of the ground state, $X^{2}\sum^{+}$. For $^{13}CO^{+}$ where the selectively excited low lying vibrational levels of the $A^{2}\pi_{i}$ state are only slightly shifted relative to $^{12}CO^{+}$ but the high lying vibrational levels of the ground state have relatively large shifts, our data demonstrates the participation of the high lying ground state vibrational levels in the radiative quenching process.
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$^{1}$ V. E. Bondybey and T.A. Miller, J. Chem. Phys. 69, 3597 (1978).
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