Acta Phys. -Chim. Sin. ›› 1987, Vol. 3 ›› Issue (05): 474-478.doi: 10.3866/PKU.WHXB19870507

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RELAXATION STUDIES OF IODINE MOLECULES IN SUPERSONIC JETS Ⅱ. VIBRATIONAL RELAXATION

Ma Zhiliu; Huang Ruiping   

  1. Dalian Institute of Chemical Physics Academia Sinica
  • Received:1986-02-24 Revised:1986-08-16 Published:1987-10-15

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Abstract: Using LIF technique, the distribution of vibrational temperature of I_2 along a supersonic jet axis has been measured, He, Ar and N_2 are used as carrier gases, The vibrational relaxation cross-section has been estimated, based on the “sudden freeze” model. The classical Landau-Teller theory can not be used to explicate that phenomenon: the vibrational relaxation cross-section become larger in low temperature. The mechanism of vibrational relaxation in jets has been analysed with the “orbiting resonance” model qualitatively.