Ar-HCl转动跃迁光谱线压力加宽截面的理论计算

本文利用量子力学的Infinite Order Sudden Approximation近似方法和Ar-HCl H6(2)相互作用解析势模型，计算了HCl分子转动跃迁谱线被Ar展宽的压力加宽截面（相对能量范围30cm^-1—1000^-1)和平均弛豫截面（系统温度125K，175K，300K）.通过与密耦合方法（CC）计算值及实验值的比较，发现IOSA近似方法对转动能级较为稀疏的分子的j=0←j=1转动路迁谱线仍然可给出较好的计算结果，但要用于转动激发态跃迁谱线的计 关键词：

THEORETICAL CALCULATION OF PRESSURE-BROADENED CROSS SECTION FOR PURE ROTATIONAL DIPOLE TRANSITION OF Hel IN Ar

The pressure-broadened cross section (kinetic energy of the collision range:30 cm^-1—1000cm^-1) and the avarage relaxation cross section (temperature of the interaction system:125K,175K,300K) for pure rotational dipole transition of HCl in Ar are calculated,by employing infinite or-der sudden approximation (IOSA) and Ar-HCl H6(2) analyti potential energy surface of Hutson.Comparing the IOSA results with Close-Coupling results and experiments,we find that IOSA can give satisfactory results for j=0←j=1 transition line of the molecules which have large rotational constant.Unfortunately,modfication must be performed for using IOSA in the exitation of transition lines.