光学-光学双共振激发K2到91∑+g高位态, 研究了K2(91∑+g)与H2的电子-振转碰撞能量转移。利用相干反斯托克斯(CARS)光谱技术探测H2的振转态分布, 扫描CARS谱表明H2在(1, 1)、(2, 1)、(2, 2) 、(3, 1)、(3, 2)、(3, 3) 和(3, 5)能级上有布居。由时间分辨CARS轮廓得到H2各振转能级上粒子数之比, 得到H2的平均振动能和平均转动能分别为9063 cm-1和388 cm-1。从91∑+g→11∑+u、11∑+u→11∑+g、33∏g→13∑+u跃迁的时间分辨激光感应荧光(LIF)强度得到它们的自发辐射率和碰撞转移率。在H2压强为3×103 Pa时, K2(91∑+g)与H2的碰撞转移能为16930 cm-1。H2的平均振转能占平均转移能的56％。

The electronic to rovibrational energy transfer between the high-lying 91∑+gstate of K2and H2 has been investigated. The 91∑+gstate is excited using the optical-optical double resonance.The CARS (Coherent Anti-Stokes Raman Scattering) spectral technique has been used to probe the internal state distribution of collisionally-populated H2 molecules.The scanned CARS spectra reveal that H2molecules are produced at (1,1)、(2,1)、 (2,2)、 (3,1)、(3,2)、(3,3) and(3,5)levels.The actual population ratios are determined through time resolved CARS profiles. The major vibrational energy (9063 cm-1) release and the minor rotational energy (388 cm-1) release are shown. The decay signals of the time-resolved fluorescene from 91∑+g→11∑+u、11∑+u→11∑+gand 33∏g→13∑+utransition are monitored.Based on Stern-Volmer equation,radiative rates and collision transfer rates of three states 91∑+g、11∑+uand 33∏g have been determined. In PH2=3×103 Pa,the transfer energy (16930cm-1) is obtained.The efficiency of the electronic-to-rovibrational energy transfer is 56％ for the K2 91∑+g-H2 system.