Na_2(B^1∏_u)+Na(3S)碰撞能量转移  

Energy Transfer Collision for Na_2(B^1∏_u)+ Na_2(3S) System

作　　者：殷桂琴[1] 李媛媛[1] 穆保霞[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：《新疆大学学报（自然科学版）》2005年第1期55-58,共4页Journal of Xinjiang University(Natural Science Edition)

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B1∏u电子态,记录了Na原子的跃迁和Na2分子的A1∑_u^+-X1∑_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原子线是Na2(B1∏u)到Na(3P)的碰擅能量转移产生的,顶解离过程也可产生原子线.而A1∑_u^+-X1∑_g^+谱带是由B1∏u到21∑_g^+的碰撞转移后再由21∑_g^+到A1∑_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(B1∏u)到Na2(21∑_g^+)碰撞转移速率系数为7.1×10-10cm3s-1,而B1∏u的预解离率为2.3×106s-1.对不同振动能级间的碰撞激发转移[Na2(B1∏u)(v'=6)+Na(3S)→Na2(B1∏u)(v'=5,7)+Na(3S)]也进行了研究,并得到了v'=5和7时的速率系数分别是1.3×10-10cm3s-1和1.1×10-10cm3s-1.The B1∏u electronic state of Na2 is excited by the 532. 0nm laser line. The Na atomic transitions and the A1∑_u^+→X1∑_g^+ band of Na2 have been recorded. From the intensities and spectra of the Na and Na2 fluorescence, several collisional processes in the excited sodium atom-dimer system have been identified. The Na atomic lines are the result of collisional energy transferred from the Na2(B1∏u) to the Na(3P). Predisso-ciation process may also contribute to atomic fluorescence. The A1∑_u^+→X1∑_g^+band is interpreted through a populating mechanism involved collisional transfer from the B1∏u to the 21∑_g^+ followed by radiative transfer to the A1∑_u^+state. From the decay constants and fluorescence intensities,the rate coefficient at 360℃ for collisional energy transferred from Na2(B1∏u) to Na2(21∑_g^+) is 7.1×10-10cm3S-1. The predissociation rate of the B1∏u is 2. 3×106S-1. Collisional excitation transfer between different vibrational levels [i.e. ,Na2(B1∏u)(v' = 6) + Na(3S)→Na2(B1∏u)(v'' = 5,7)+Na(3S)] is also investiged. Rate coefficients for v' being 5,7 are 1. 3×10-10cm3s-1and 1.1×10-10cm3s-1,respectively.

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]