Abstract：The radiative lifetimes and rate coefficients for deactivation of high lying 61Σ+ state of NaK by collisions with H2 were studied. An OPO laser was set to a particular 21Σ+←11Σ+ transition. Another single mode Ti sapphire laser was then used to excite molecule from 21Σ+ level to the 61Σ+ state. The predissociation was monitored by the atomic potassium emission at the 3D→4P (1.7 μm) or the S→4P(1.24 μm), while bound state radiative processes were monitored by total fluorescence from the upper state to the various levels, all studied as a function of H2 density. The values for predissociation, collisional dissociation and collisional depopulation rate coefficients were obtained. The decay signal of the time resolved fluorescence from the 61Σ+→21Σ+, 61Σ+→11Σ+or21Σ+→11Σ+ transition was monitored. Based on the Stern-Volmer equation, the radiative lifetimes were monitored for 61Σ+→21Σ+ and 21Σ+→11Σ+ transition. The rate coefficients for deactivation of collisions with H2 were monitored for 61Σ+→21Σ+, 61Σ+→11Σ+ and 21Σ+→11Σ+. When the density of H2 was 1019 cm-3, the total collisional transfer energy (15 426 cm-1) and radiative energy (10 215 cm-1) were obtained. The relative fraction (〈fv〉, 〈fR〉, 〈fT〉) of average energy disposal was derived as (0.58, 0.03, 0.39); 〈fv〉, 〈fR〉, 〈fT〉 represent separately the relative fraction of average energy disposal among vibration, rotation and translation. The major vibrational and translational energy release supports the assumption that the 61Σ+-H2 collision occurs primarily in a collisional energy transfer mechanism. In this experiment, alkali molecules relative energy population ratio was determined through using the time integrated intensity, so we can get the total transfer energy. That the NaK (61Σ+) energy transfers to the H2 vibrational, rotational and translational energy was quantitatively given for the first time, which illustrates the collisional mechanism.
Key words：Laser spectroscopy;Collisional energy transfer;Predissociation;Time resolved fluorescence;NaK(61Σ+)+H2
朱永乐，王淑英，刘 静，仲崇玉，阿布都艾尼·由力瓦斯，戴 康，沈异凡* . NaK高位61Σ+态与H2碰撞中转移能配置 [J]. 光谱学与光谱分析, 2014, 34(04): 884-887.
ZHU Yong-le, WANG Shu-ying, LIU Jing, ZHONG Chong-yu, A·Yolwas, DAI Kang, SHEN Yi-fan* . Transfer Energy Disposal in Collisions of NaK(61Σ+) with H2 . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(04): 884-887.
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