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Applied Physics B

, Volume 45, Issue 4, pp 205–214 | Cite as

CARS spectroscopy of molecules and clusters in supersonic jets

  • H. D. Barth
  • C. Jackschath
  • T. Pertsch
  • F. Huisken
Article

Abstract

Supersonic molecular beams of D2, CH4, NH3, and C2H4 are investigated in the expansion region employing collinear coherent anti-Stokes Raman spectroscopy (CARS). The analysis of rotationally resolved CARS spectra allows the determination of temperatures in the beam. The rotational relaxation as a function of stagnation pressure and separation from the nozzle is studied by recording theQ branch for D2 and the ν3R andS branches for CH4. Rotational temperatures for NH3 are determined by investigating the complete ν3 band. At strong stagnation conditions broad structures arise which can be attributed to the formation of NH3 clusters. For C2H4 the ν5 band with resolved rotational structure is reported. Again, at larger distances from the nozzle, broad structures are observed. They are assigned to the ν1 and ν5 vibrations in the C2H4 cluster.

PACS

42.65 33.20.Fb 36.40.+d 34.50.Ez 

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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • H. D. Barth
    • 1
  • C. Jackschath
    • 1
  • T. Pertsch
    • 1
  • F. Huisken
    • 1
  1. 1.Max-Planck-Institut für StrömungsforschungGöttingenFed. Rep. Germany

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