Vibrational Energy Transfer in Methane
Vibrational Energy Transfer in Methane
复制标题
甲烷中的振动能量转移
DOI：
10.1063/1.1670199
复制
发表时间：
1968
影响因子：
4.4
通讯作者：
C. Moore
中科院分区：
文献类型：
--
作者：
J. Yardley;C. Moore
甲烷的不对称伸缩振动 ν3 是由斩波氦氖激光激发的。来自不对称拉伸和红外活性弯曲ν4的红外发射的相移已被测量为斩波频率和气压的函数。已经找到了从不对称拉伸中去除能量的振动弛豫时间 (pτ = 7.0 ± 1 纳秒·大气压)、ν4 弯曲中该能量的出现 (pτ = 5 + 3, -2 纳秒·大气压)，以及振动能量弛豫为平移和旋转能量(pτ = 1.90 ± 0.10μsec·atm)。将 V → V 能量转移的机制和速率与排斥分子间势的计算进行比较。讨论了激光激发振动荧光方法的一般适用性和相移数据的解释。
The asymmetric stretching vibration ν3 of methane has been excited by a chopped He–Ne laser. The phase shift of infrared emission from the asymmetric stretch and from the infrared‐active bend ν4 has been measured as a function of chopping frequency and gas pressure. Vibrational relaxation times have been found for the removal of energy from the asymmetric stretch (pτ = 7.0 ± 1 nsec·atm), for the appearance of this energy in the ν4 bend (pτ = 5 + 3, −2 nsec·atm), and for the relaxation of vibrational energy into translational and rotational energy (pτ = 1.90 ± 0.10 μsec·atm). The mechanism and rates of V → V energy transfer are compared to calculations for a repulsive intermolecular potential. The general applicability of the laser‐excited vibrational fluorescence method and the interpretation of phase‐shift data are discussed.