Abstract
The (v′=6,J′=43) level in theB 1Π u electronic state of Na2 has been selectively populated by excitation with the 4 880 Å line of the argon laser. Through collisions with He atoms energy is transferred to neighbouring rotational states in Na2 and the density of these states is determined by observing fluorescence to electronic ground state. From previous measurement of the lifetime of theB 1Π u state and new measurements of the intensities of collision induced spectral lines as a function of He pressure, absolute collision cross sections for all rotational transitions up to ΔJ=±5 have been obtained. The total cross section for all rotational transitions observed is σ totalrot =65±15 Å2. Preliminary results about collision induced vibrational transitions are also presented.
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We thank the Deutsche Forschungsgemeinschaft for supporting this work. We are also indebted to Dr. McClintock, University of Wisconsin, who participated in the early phase of these experiments.
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Bergmann, K., Demtröder, W. Inelastic collision cross section of excited molecules. Z. Physik 243, 1–13 (1971). https://doi.org/10.1007/BF01401025
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DOI: https://doi.org/10.1007/BF01401025