TWO-PHOTON SEPECTROSCOPY OF $A^{2} \Sigma^{+}$ OH IN A FLAME
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Date
1980
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Ohio State University
Abstract
The $A^{2} \Sigma^{+}$ state of Oh has been excited by the simultaneous absorption of two photons in the 6200 {\AA} region. The pumping radiation, $\sim 50$ mJ per 10 nsec pulse from Nd: YAG-pumped dye laser, was tightly focussed into the burnt-gas region of an atmospheric pressure methane-air flame. The ultraviolet fluorescence was detected using either a spectrometer (30 {\AA} bandpass) or an interference filter for wavelength discrimination. The signal was found to be quadratic with laser intensity. Nearly 100 lines of the (0,0) band have been observed in an excitation scan; the experimental and calculated two-photon line strengths will be discussed. The two-photon cross section is small, estimated experimentally at $\sim 10^{-36}$ $cm^{4}$/watt.
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