Acta Phys. -Chim. Sin. ›› 1990, Vol. 6 ›› Issue (01): 23-31.doi: 10.3866/PKU.WHXB19900105

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Quantitative Measurements of Vibrational Relaxation Rates in Supersonic Jets of I2 B(ν′=43) State

Ma Zhi-Liu;Huang Rui-Ping   

  1. Dalian Institute of Chemical Physics Academia Sinica
  • Received:1988-06-06 Revised:1989-01-16 Published:1990-02-15
  • Contact: Ma Zhi-Liu

Abstract: A LIF technique that employs a varying view field has been developed to give quantitative measurement for the vibrational relaxation rates of I_2 B(v′=43) state in supersonic jets. The data for Ar, N_2 and CO are obtained for the first time. The results have shown that the measured vibrational relaxation rates in cold jets bear an inverse tempeature dependence. For He and H_2 carrier gases, the dominant relaxation process is the usual △v=-1 process. For Ar, N_2 and CO, however, the most probable relaxation pathway is no longer Δv=-1 process, which apparently violates the energy gap law. These observations are adequately explained by a metastable complex formation mechanism.