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in flow with Ar (SF6: Ar=1:100) in conditions of a large vibrational/rotational temperature difference (TV≃230 K, TR≃60 K) was studied at moderate energy fluences from ≃0.1 to ≃100 mJ/cm2, which are of interest for isotope selective two-step dissociation of molecules. A 50 cm Laval-type slit nozzle for the flow cooling, and a TEA CO2-laser for excitation of molecules were used in the experiments. The laser energy fluence dependences of the SF6 MPA were studied for several CO2-laser lines which are in a good resonance with the linear absorption spectrum of the ν3 vibration of SF6 at low temperature. The effect of the laser pulse duration (intensity) on MPA of flow cooled SF6 with Ar was also studied. The results are compared with those obtained in earlier studies.
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Received: 4 September 1995/Revised version: 15 February 1996
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Makarov, G., Ronander, E., van Heerden, S. et al. IR multiphoton absorption of SF6 in flow with Ar at moderate energy fluences . Appl Phys B 65, 583–587 (1997). https://doi.org/10.1007/s003400050317
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DOI: https://doi.org/10.1007/s003400050317