Li/Li2 supersonic nozzle beam

The characterization of a lithium supersonic nozzle beam has been made using spectroscopic techniques. It is found that at a stagnation pressure of 5.3 kPa (40 Torr) and a nozzle throat diameter of 0.4 mm the ground state vibrational population of Li(2) can be described by a Boltzmann distribution w...

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Bibliographic Details
Published inReview of scientific instruments Vol. 49; no. 3; p. 380
Main Authors Wu, C Y, Crooks, J B, Yang, S C, Way, K R, Stwalley, W C
Format Journal Article
LanguageEnglish
Published United States 01.03.1978
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Summary:The characterization of a lithium supersonic nozzle beam has been made using spectroscopic techniques. It is found that at a stagnation pressure of 5.3 kPa (40 Torr) and a nozzle throat diameter of 0.4 mm the ground state vibrational population of Li(2) can be described by a Boltzmann distribution with T(v)= (195+/-30) K. The rotational temperature is found to be T(r)= (70+/-20) K by band shape analysis. Measurements by quadrupole mass spectrometer indicate that approximately 10-mol. % Li(2) dimers are present far downstream for an oven body temperature of 1370 K in the supersonic nozzle expansion. This measured mole fraction is in agreement with the existing dimerization theory.
ISSN:0034-6748
DOI:10.1063/1.1135412