carbon dioxide的$ν_1 / 2ν_2$费米二体区量子干涉的Raman观测
Raman observations of quantum interference in the $ν_1 / 2ν_2$ Fermi dyad region of carbon dioxide
摘要：
在正柱放电条件下，获得了CO $_2$的相干反斯托克斯拉曼光谱（CARS）。的拉曼跃迁的强度显着降低时，放电被打开，因为均衡的较低和较高的状态人口的电子碰撞激发，以类似于饱和的方式，$ν_1 / 2ν_2$费米二分体。观察到1285 cm $^{-1}$跃迁的强度比1388 cm $^{-1}$谱线降低20倍，这是由于量子干涉降低了1285 cm $^{-1}$跃迁的上态的振动弛豫速率。这种干扰通过测量从状态的衰变率来验证。实验排除斯塔克效应和偏振效应的描述。支持所观察到的电子快速振动激发，观察到在1425.61 cm $^{-1}$处的强热带跃迁$20^00 \leftarrow 02^20$。这些意见进行了比较，最近的测量CO $_2$在火焰中加热的拉曼光谱。
英文摘要：
Coherent anti-Stokes Raman spectra (CARS) were obtained for CO$_2$ in a positive column discharge. The intensities of the Raman transitions to the $ν_1 / 2ν_2$ Fermi dyad decrease significantly when the discharge is turned on because of equalization of the lower and upper state populations by electron impact excitation, in a manner similar to saturation. The strength of the 1285 cm$^{-1}$ transition is observed to decrease by a factor of 20 greater than the 1388 cm$^{-1}$ line due to a quantum interference decreasing the vibrational relaxation rate of the upper state of the 1285 cm$^{-1}$ transition. This interference is verified by measurements of the decay rates from the state. Experiments ruling out Stark effects and polarization effects are described. Supporting the observed rapid vibrational excitation by electrons, a strong hot band transition $20^00 \leftarrow 02^20$ at 1425.61 cm$^{-1}$ was observed. These observations are compared with recent measurements of the Raman spectra of CO$_2$ heated in a flame.
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