852.3 nm激光线共振激发Cs蒸气的荧光光谱

研究了Cs蒸气被单模半导体激光器的852.3 nm线激发产生的荧光光谱。由Cs，Cs₂的荧光及其强度确定了在受激Cs-Cs₂系统中的若干碰撞和辐射过程。高位态原子线是由Cs(6P_3/2)+ Cs(6P_3/2)到Cs(6D，8S)的碰撞能量合并形成的，Cs₂(B 1∏_u)带则由Cs(6P)+Cs₂(X 1Σ+_g)碰撞转移产生。通过激发转移、能量碰撞合并和Cs₂-Cs碰撞传能研究了6 2P原子的精细结构混合，得到了6P_3/2→6P_1/2碰撞转移速率系数是(5.2±2.1)×10-11 cm3·s-1,给出了过程Cs₂(B 1∏_u)+Cs(6S)→Cs₂(X 1Σ+_g)+Cs(6P_1/2)的速率系数是(1.0±0.4)×10-9 cm3·s-1。

Fluorescence Spectrum of Cesium Vapor Resonantly Excited by the 852.3 nm Laser Line

The fluorescence spectrum of cesium vapor was studied in a cell irradiated with the light of 852.3 nm resonance line from a single mode laser diode. From the intensities and spectra of the Cs and Cs2 fluorescence we identified several collisional and radiative processes in the excited cesium atom-dimer system. The atomic lines of the highly excited states were the result of collisional energy transfer from Cs(6P 3/2) + Cs(6P 3/2) to Cs(6D, 8S) atoms. The Cs2 (B 1 IIu) band formed in Cs (6P) + Cs2 (X1sigmag+) collisions. The fine-structure mixing in 6 2P atoms was studied through excitation transfer, energy-pooling collision, and collisional excitation transfer between Cs2 and Cs. The authors estimated the value of rate coefficient for the collisional energy transfer from 6P3/2 to 6P1/2 to be (5.2+/-2.1) x 10(-11) cm3 x s(-1). For the excitation transfer process Cs2 (B 1 IIu)+ Cs(6S)--> Cs2 (X 1sigmag+) + Cs(6P1/2 ), a rate coefficient of (1.0+/-0.4) x 10(-9) cm3 x s(-1) was yielded.