碰撞诱导钠分子 A^1Σ_u^+→Χ~1Σ_g^+ 的荧光光谱  

Collision-induced fluorescence of Na_2:the A^1Σ_u^+→Χ~1Σ_g^+ system

作　　者：李媛媛[1] 殷桂琴[1] 王淑英[1] 刘静[1] 戴康[1] 沈异凡[1] 

机构地区：[1]新疆大学物理系,乌鲁木齐830046

出　　处：《原子与分子物理学报》2005年第2期230-233,共4页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金项目(10264004)

摘　　要：用532 0nm激光激发Na2分子到B1Πu电子态,记录了Na(3P)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Na-Na2系统中的碰撞过程,Na(3P)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的辐射而引起的。在360℃,u-Χ1Σ+g到A1Σ+g谱带是由B1Πu到21Σ+g的碰撞转移后再由21Σ+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7 1×10-10cm3s-1,而B1Πu的预解离率为2 3×106s-1。The B()~1Π_u electronic state of Na_2 is excited by the 532.0?nm laser line.The Na(3P) atomic transitions and the A()~1Σ^+_u→X()~1Σ^+_g band of Na_2 have been recorded.From the intensities and spectra of the Na and Na_2 fluorescence several collisional processes in the excited sodium atom-dimer system have been identified.The Na(3P) atomic lines are the result of collisional energy transfer from the Na_2 (B()~1Π_u) to the Na(3P).Predissociation process may also contribute to atomic fluorescence.The A()~1Σ^+_u→X()~1Σ^+_g band is interpreted through a populating mechanism involving collisional transfer from the B()~1Π_u to the 2()~1Σ^+_g followed by radiative transfer to the A()~1Σ^+_u state. From the decay constants and fluorescence intensities,the rate coefficient at 360℃ for collisional energy transfer from Na_2(B()~1Π_u) to Na_2(2()~1Σ^+_g) is 7.1×10^(-10)?cm^3S^(-1).The predissociation rate of the B()~1Π_u is 2.3×10~6?S^(-1).

关 键 词：钠分子 低位激发态 碰撞转移 预解离 荧光光谱 

分 类 号：O562.4[理学—原子与分子物理] O562.5[理学—物理]