STIMULATED EMISSION SPECTROSCOPY OF ACETYLENE: THE $\tilde{X}^{1}\Sigma^{+}_{g}$ STATE AT $10,000-14,000 CM^{-1}$
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Date
1984
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Publisher
Ohio State University
Abstract
Stimulated Emission Pumping (SEP) is a variant of Optical-Optical Double Resonance, utilizing two pulsed dye lasers. The first laser, the PUMP, is tuned to populate a single rotation-vibration level of the $\tilde{A}^{1}A_{u}$ state of $^{12}C_{2}H_{2}$. The second laser, the DUMP, stimulates emission downward from the prepared level into a vibrationally excited level of the electronic ground state, $\tilde{X}^{1}\Sigma^{+}_{g}$. The SEP signal is seen as a decrease in $A\to X$ side fluorescence when the DUMP laser is on resonance. Because the A-state of acetylene is trans-bent in its equilibrium configuration, Franck-Condon factors permit us to DUMP into vibrational levels with primarily trans-bending character. In the present talk, we will discuss the SEP spectrum of the $\tilde{X}^{1}\Sigma^{+}_{g}$ state of acetylene at $\sim 10,000-14,000 cm^{-1}$ of energy above the vibrational ground state. Experimental details of the SEP technique will also be given.
Description
Author Institution: Department of Chemistry, Massachusetts Institute of Technology