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利用改变观察场位置的方法,用LIF法定量测量了超音速射流中I_2B(υ’=43)能极的振动弛豫速率.首次获得了Ar,N_2和CO等分子的驰豫截面.结果表明,低温射流中振动弛豫速率呈负温度关系,对载气He和H_2,主要弛豫过程是△υ=-1通道,但对Ar,N_2和CO等载气,多振动量子传输很显著,特别是对双原子分子,最可几弛豫通道不再是△υ=-1过程.这违反了能隙定律.这种现象可用亚稳态络合物的形成来解释。
The vibrational relaxation rate of I 2 B (υ ’= 43) in the supersonic jet was measured by the LIF method, and the relaxation cross section of Ar, N 2 and CO molecules was obtained for the first time by changing the position of the observing field. , The relaxation rate of the low-temperature jet has a negative temperature dependence, and the main relaxation process for the carrier gases He and H 2 is the Δν = -1 channel. However, for the carrier gas such as Ar, N 2 and CO, the multi-vibration quantum transmission is significant, Especially for diatomic molecules, the most relaxable channel is no longer △ υ = -1 process, which violates the law of energy gap.This phenomenon can be explained by the formation of metastable complexes.