钠分子B^1Π_u与2~1Σ_g^+间的碰撞激发转移  

Collisional Excitation Transfer between Na_2(B^1Π_u) and Na_2(2~1Σ_g^+)

作　　者：雷振宙[1] 刘静[1] 周小岩[1] 戴康[1] 沈异凡[1] 

机构地区：[1]新疆大学物理系,新疆乌鲁木齐830046

出　　处：《光谱学与光谱分析》2005年第2期171-173,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金(10264004)资助项目

摘　　要：用HeCd激光器的4416nm线激发Na2分子到B1Πu电子态,记录了Na原子的跃迁和Na2分子的A1Σ+u-Χ1Σ+g的谱带。由Na与Na2激发态发射的光谱及其强度可以认定在NaNa2系统中的碰撞过程,Na原子线是Na2(B1Πu)到Na(3P)的碰撞能量转移产生的,预解离过程也可产生原子线。而A1Σ+u-Χ1Σ+g谱带是由B1Πu到21Σ+g的碰撞转移后再由21Σ+g到A1Σ+u的辐射而引起的。在360℃,根据辐射衰变率和荧光强度,得到Na2(B1Πu)到Na2(21Σ+g)碰撞转移率系数为57×10-10cm3·s-1,而B1Πu的预解离率为27×106s-1。The B 1Πu electronic state of Na2 was excited by the 441.6 nm He-Cd laser line. The Na atomic transitions and the A 1Σu+ -> X 1Σg+ band of Na2 were recorded. From the intensities and spectra of the Na and Na2 fluorescence several collisional processes in the excited sodium atom-dimer system were identified. The Na atomic lines are the result of collisional energy transfer from Na2(B 1Πu) to Na(3P). Predissociation process may also contribute to atomic fluorescence. The A 1Σu+ -> X 1Σg+ band is interpreted through a populating mechanism involving collisional transfer from B 1Πu to 2 1Σg+ followed by a radiative transfer to the A 1Σu+state. From the decay constants and fluorescence intensities, the rate coefficient at 360°C for collisional energy transfer from Na2(B 1Πu) to Na2(2 1Σg+) was found to be 5.7 × 10-10 cm3·s-1. The predissociation rate of the B 1Πu is 2.7 × 106 s-1.

关 键 词：NA原子 解离 衰变率 分子 激发态 碰撞 电子态 转移 E-CD 辐射 

分 类 号：O562[理学—原子与分子物理] R735[理学—物理]