LASER SPECTROSCOPIC INVESTIGATION OF THE ORANGE BANDS OF Sr0
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Date
1990
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
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. The so far unclassified red and orange bands in the region 14700 to $15700 cm^{-1}$ and 16600 to $16900 cm^{-1}$[1] are undoubtedly attributed to Sr0 and partly share a common upper state. Laser excitation in the particularly congested spectrum near $16800 cm^{-1}$ with a cw dye laser of about 1 $cm^{-1}$ linewidth leads to emission into the $X^{\prime}\Sigma^{+}$ ground state of SrO from two different states at 26360 and $26720 cm^{-1}$ above $\Sigma^{\prime}\Sigma^{+}(v^{\prime\prime}=O)$. The spectrum around a separate bandhead at $16852 cm^{-1}$ was recorded at rotational resolution with a single mode laser. Fluorescence from the excited upper state of this system into the ground state, the well resolved A-doubling in the laser excitation spectra, and the determined rotational constants indicate that the lower state of this band is $a^{3}\pi_{1}[1]$ and that the upper state should be a $\pi$ state.
Description
[1] K. P. Huber and G. Herzberg. Molecular Spectra and Molecular Structure, Vol. IV, Constants of Diatomic Molecules, Van Nostrand-Reinhold, New York 1979.
Author Institution: Department of Physics, Penn State University; Institut fur Molekulphysik, Freie Universitat Berlin; Department of Physics, Penn State University
Author Institution: Department of Physics, Penn State University; Institut fur Molekulphysik, Freie Universitat Berlin; Department of Physics, Penn State University