【摘要】 研究了C s(6P3/2)+C s(6P3/2)+H e→C s(n lJ=8S1/2,4F5/2、4F7/2)+C s(6S1/2)+H e的碰撞能量转移过程.在温度为330~340 K,单模半导体激光器共振激发C s原子至6P2/3态,利用另一与泵浦激光束反向平行激光束作为吸收线探测6P3/2态原子密度及其空间分布.缓冲气体增大了两个6P3/2原子间的能量转移,这可从测量由两个C s(6P3/2)原子碰撞而被布居的n lJ态所发射的荧光得到证实.三体碰撞速率系数分别为(1.80±0.72)×1-0 27cm6-s 1、(1.28±0.51)×10-27cm6s-1、(2.23±0.89)×1-0 27cm6-s 1.更多还原

【Abstract】 An experimental study of energy transfer collisions,Cs\$（6P₃/2）\$+ Cs\$（6P₃/2\$）+He→Cs（nl_J）+Cs\$（6S₁/2\$）+He where \$nl_J\$=\$8S₁/2,4F₅/2\$ or \$4F₇/2\$,in the range 330K to 340K,been carried out in a cell.Atoms were excited to the \$6P₃/2\$ state using a single-mode diode laser.The Cs\$（6P₃/2\$） atom density and spatial distribution were mapped by monitoring the absorbion of a counterpropagating laser beam.The buffer gas enhanced the energy transfer between two \$6P₃/2\$,which was based on the measurement of the fluorescence from the \$nl_J\$ states populated by three-body collision.The three-body collision rate coefficients（in units of 10^-27cm⁶\$s^-1）\$ for 8\$S₁/2,4F₅/2\$ and \$4F₇/2\$ are 1.80±0.72,1.28±0.51 and 2.23±0.89,respectively.更多还原