LASER SPECTROSCOPY OF STRONTIUM MONOXIDE NEAR 16800 $cm^{-1}$: ABSORPTION FROM THE LOW LYING $^{1}\pi$ AND $^{3}\pi$ STATES

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1991

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Ohio State University

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The flame reaction $Sr+N_{2}O$ was investigated in a Broida-type oven by using laser excitation spectroscopy and dispersing the laser induced fluorescence with a 1/3m - monochromator. Previously reported results about a transition near 16852 $cm^{-1}$ involving a new triplet state at about 26300 $cm^{-1}$ above the ground state could be improved. A new bandhead at 16846 $cm^{-1}$ was found and could be assigned to the transition $A^{\prime}$ $^{1}\pi$ - B $^{1}\pi$. The observed wavelength of the bandhead is in good agreement with the value calculated from molecular data published by other groups [1]. Fluorescence from the B $^{1}\pi$ state into another excited state at about 9000 $cm^{-1}$ above the ground state was observed (probably a $^{3}\sum$ state). [1] K. P. Huber and G. Herzberg, Molecular Soectra and Molecular Structure"", Vol. IV, ""Constants of Diatomic Molecules, Van Nostrand-reinhold, New York 1979.

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Author Institution: Department of Physics, Penn State University

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