摘要
研究了Cs(6P)+Cs(6S)+He→Cs(5D)+Cs(6S)+He的碰撞能量转移过程。单模半导体激光器共振激发Cs原子至6P3／2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6Pa／2态原子密度及其空间分布。缓冲气体增大了6P3／2和6S1／2原子间的能量转移,这可从测量由Cs(6P)／Cs(5D)碰撞而被布居的7D态所发射的荧光得到证实。因5D→6P(3．0-3.6μm)处于红外本实验不能探测,利用一个已经测量过的过程(即6P+5D→6S+7D)作相对测量。得到三体碰撞速率系数为(2．2±1．1)×10-28cm6s-1。
An experimental study of energy transfer collisions, Cs（6P）＋Cs（6S）＋He→Cs（5D）＋ Cs（6S）＋He, at thermal energies, was carried out in a cell. Atoms were excited to the 6P3/2 state using a single-mode diode laser. The Cs（6P） atom density and spatial distribution were mapped by monitoring the absorption of a counter-propagating laser beam. The buffer gas enhanced the energy transfer between Cs（6P） and Cs（6S）, which was based on the measurement of the fluorescence from the 7D state populated by the Cs（6P）/Cs（5D） collisions. Since the 5D→6P fluorescence（3.0-3.6μm） can not be detected with this experiment, the rate coefficient has been measured relative to the known rate coefficient of the collision （i.e., 6P＋5D→6S＋7D）. The three-body collision rate coefficient [k3 = （2.2±1.1）×10^-28cm^6s^-1] is obtained.
出处
《量子电子学报》
CAS
CSCD
北大核心
2006年第5期603-606,共4页
Chinese Journal of Quantum Electronics
基金
国家自然科学基金(10264004)资助项目
关键词
光谱学
三体碰撞转移
荧光
CS
spectroscopy
three-body collision transfer
fluorescence
Cs
