中国物理B ›› 1997, Vol. 6 ›› Issue (11): 837-840.doi: 10.1088/1004-423X/6/11/005

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METHOD FOR THE STUDY OF FAST VIBRATIONAL RELAXATION OF MOLECULES USING SPECTROPHONE

V.A.KAPITANOV, B.A.TIKHOMIROV, O.V.TIKHOMIROVA   

  1. Institute of Atmospheric Optics SB RAS,1 Akademicheskii av., Tomsk 634055, Russia
  • 收稿日期:1996-08-09 修回日期:1997-02-17 出版日期:1997-11-20 发布日期:1997-11-20
  • 基金资助:
    Project supported by the Russian Fundamental Science Foundation.

METHOD FOR THE STUDY OF FAST VIBRATIONAL RELAXATION OF MOLECULES USING SPECTROPHONE

V.A.KAPITANOV, B.A.TIKHOMIROV, O.V.TIKHOMIROVA   

  1. Institute of Atmospheric Optics SB RAS,1 Akademicheskii av., Tomsk 634055, Russia
  • Received:1996-08-09 Revised:1997-02-17 Online:1997-11-20 Published:1997-11-20
  • Supported by:
    Project supported by the Russian Fundamental Science Foundation.

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摘要： A technique for measuring the vibration translational relaxation time of molecular gases using the spectrophone is described. The technique is based on the measurement of the phase of natural oscillations of the microphone membrane as a function of pressure of the gas under study. These oscillations manifest themselves in a shape of the optoacoustic (OA) signal at low gas pressure in the OA cell when the absorbing molecules are excited by short laser pulses. As an example the results on the relaxation time of the v1+3v3 state of H2O molecule in H2O-H2O and H2O-air collisions obtained using the OA cell of various sizes are presented.

Abstract: A technique for measuring the vibration translational relaxation time of molecular gases using the spectrophone is described. The technique is based on the measurement of the phase of natural oscillations of the microphone membrane as a function of pressure of the gas under study. These oscillations manifest themselves in a shape of the optoacoustic (OA) signal at low gas pressure in the OA cell when the absorbing molecules are excited by short laser pulses. As an example the results on the relaxation time of the v1+3v3 state of H2O molecule in H2O-H2O and H2O-air collisions obtained using the OA cell of various sizes are presented.

中图分类号:  (Infrared, submillimeter wave, microwave and radiowave instruments and equipment)

  • 07.57.-c
51.70.+f (Optical and dielectric properties) 51.40.+p (Acoustical properties) 33.80.-b (Photon interactions with molecules) 43.35.Sx (Acoustooptical effects, optoacoustics, acoustical visualization, Acoustical microscopy, and acoustical holography)