A new fully quantum-mechanical method used to calculate the collisional broadening coefficients and shift coefficients of Rb D_1 lines perturbed by noble gases He and Ar

In this work, a new full quantum method is proposed to calculate the broadening and shift coefficients of the D1 line in neutral collision. Based on the variable phase approach and Baranger theory, this method calculates the scattering phase shift instead of scattering matrix elements in order to simplify the calculation. As an illustration, this method is used to calculate the broadening and shift coefficients of the absorption lines of alkali metal atom Rb, as it collides with buffer gas He and Ar, in a temperature range from 150 K to 800 K. With a comparison with other calculations and experiment measurements, the reasonable agreements in all cases demonstrate the validity and simplicity of this method.

基于2.32μm TDL的CO吸收光谱参数测量

采用2.32μm的可调谐二极管激光器(TDL)测量了一氧化碳(CO)气体v(0→2)振动带R转动带从R(4)至R(12)9条谱线在N_(2)为背景气下的碰撞展宽系数,且与HITRAN数据库对比并给出了谱线展宽系数随转动量子数的变化关系。本文通过采用WM-DAS方法提高实验信噪比,在不同压力(1~100 kPa)下采用Voigt(VP),Rautian(RP),Galatry(GP)和Speed-dependent Voigt(SDVP)模型对实验测量吸收率进行拟合并探究各类线型不同参数随压力的变化关系。本文还以R(10)谱线为例测量了该谱线在He,N_(2)和Ar为背景气下的碰撞展宽系数和压力频移系数,并探究了Dicke收敛系数和速度依赖性系数随压力变化的非线性关系,且通过定义残差-吸收峰值比,分析了不同背景气下R(10)谱线的收敛效应。最后,本文结合该波长范围内CO谱线的吸收强度、展宽特性和抗H_(2)O分子光谱干扰能力,推荐R(6)和R(10)两条谱线用于工业现场测量CO浓度。

甲烷中红外7.16μm吸收光谱参数测量

介绍了一套高精度气体吸收光谱测量系统,并采用7.16μm的量子级联激光器(QCL)测量了甲烷(CH_(4))气体在该波长附近不同压力(5~30 kPa)和温度(290~1050 K)范围的光谱参数。同时,本文不仅测量了纯甲烷环境下的分子自身光谱参数,还测量了其在Ar, N和He三种不同相对分子质量的背景气下的各类谱线参数。实验发现,本文测量的甲烷谱线在不同环境下的碰撞展宽系数由大到小分别是:自身>N>Ar>He,四种环境下测量谱线的压力频移系数均为负数,及谱线压力频移与压力呈负相关,其绝对值由大到小排列分别为:自身>N>Ar>He,与碰撞展宽系数变化规律相同。本文对所有测量的谱线参数均计算了各自的不确定度且定量分析了各类不确定度的来源。