Parameters of pulsed supersonic jets of SF6 and NH3 molecules studied using a spectrometer with tunable diode lasers

Yu. A. Kuritsyn; G. N. Makarov; I. Pak

doi:10.1117/12.58683

1 April 1992 Parameters of pulsed supersonic jets of SF₆ and NH₃ molecules studied using a spectrometer with tunable diode lasers

Yu. A. Kuritsyn, G. N. Makarov, I. Pak

Author Affiliations +

Proceedings Volume 1724, Tunable Diode Laser Applications; (1992) https://doi.org/10.1117/12.58683
Event: Tunable Diode Laser Applications, 1993, Moscow, Russian Federation

Abstract

A qualitative pattern of cooling molecules in a pulsed supersonic jet is given on the basis of literature data. A procedure of measurements is described and known relations are presented which allow the determination of rotational temperatures and concentrations of molecules in a jet using the measured intensities of infrared absorption lines. The parameters of SF₆ and NH₃ jets have been determined for various pulsed valves by means of tunable diode lasers. We used pulsed supersonic jets to study collisionless infrared excitation of SF₆ and NH₃ molecules by an intensive laser field. An important point in the treatment of these experiments was to know with sufficient accuracy the concentration of molecules in a jet and their distribution over rotational levels of the ground vibrational state (characterized by the rotational temperature T_rot in the case of Boltzman distribution). We determined these parameters from the measurements made by means of tunable diode lasers. Various pulsed valves were tried which allowed us to obtain jets with different gas temperatures and different concentrations of molecules.

Citation Download Citation

Yu. A. Kuritsyn, G. N. Makarov, and I. Pak "Parameters of pulsed supersonic jets of SF₆ and NH₃ molecules studied using a spectrometer with tunable diode lasers", Proc. SPIE 1724, Tunable Diode Laser Applications, (1 April 1992); https://doi.org/10.1117/12.58683

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