SPECTROSCOPY OF ALKALINE EARTH MONOHALIDES FORMED IN CHEMILUMINESCENT REACTIONS

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1981

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Ohio State University

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In most cases absorption, emission, and LIF spectroscopy of small molecules, is performed in flames or vapor cells. Thus the analysis of vibrational/rotational sequences is very often limited to those states populated according to a Boltzmann equilibrium determined by the pressure and temperature conditions. In this work the attempt has been made to extract information on high vibrational levels of some alkaline earth monohalides from high resolution chemiluminescence spectra from the reactions between Ca*, Sr* in their metastable $^{3}P, ^{1}D$ states and chlorine containing compounds (HCl, $CCl_{4}$, $Cl_{2}$, ICl) forming electronically excited $CaCl^{*}$ and $SrCl^{*}$. Spectra have been obtained either under single-collision conditions in a beam-gas arrangement (vibrational levels up to the exothermicity limit are significantly populated) or from a jet source [1,2] which can be operated under pressure conditions varying from several milli Torrs (quasi single collision, extremely high vibrational levels populated) up to several Torrs (vibrationally/rotationally relaxed spectra). This allowed us to make a systematic investigation of the first excited $^{1}\Sigma^{+}$ and $^{2}\Pi$ states of CaCl, SrCl up to vibrational levels of v= 50.

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[1] U. Brinkmann, H. Busse, K. Pippert, H. Telle; Appl. Phys. 18, 249 (1979) [2] U. Brinkmann, v. H. Schmidt, H. H. Telle; Chem. Phys. Lett. 73, 530 (1980)
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