摘要
用染料激光照射温度为250℃的Na蒸汽,将基态Na原子激发到3P态,两个Na(3P)原子碰撞,产生缔合电离,测量了缔合电离截面。本实验的关键是激发态原子密度及其空间分布的确定。本文用三种不同的方法测定Na(3P)原子密度,并仔细地研究了它们的空间分布;结合电离电流的测量,得到了缔合电离截面σ_(Al)=4.2×10^(-17)cm^2(±36％)。与其它实验结果作了比较,并进行了讨论。
We have measured the cross section [σAI = 4.2× 10-17 cm2±36%] for associative ioniza-tion occurring in collisions between two Na(3P) atoms, by measuring the current reselting from excitation of Na vapor with CW-laser radiation. The major experimental difficulty in measurements of this type is in the determination of the number density and spatial distribution of excited atoms. Here we have measured the excited-atom density by three independent methods, and we have studied the spatial distribution of excited atoms in detail. We have compared the cross section obtained by us al =523k with other experimental results.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第1期32-39,共8页
Acta Physica Sinica
基金
国家自然科学基金
关键词
钠
激发态
碰撞电离
缔合
Atomic physics
Atoms
Dye lasers
Electric excitation
Sodium
Vapors
