Collisional broadening and shift of D1 and D2 spectral lines in atomic alkali vapor - noble gas systems
Collisional broadening and shift of D1 and D2 spectral lines in atomic alkali vapor - noble gas systems
复制标题
DOI：
--
复制
发表时间：
2013-03
期刊：
影响因子：
--
通讯作者：
R. Loper
中科院分区：
文献类型：
--
作者：
R. Loper
文摘：利用散射矩阵元计算的散射相移差，用Baranger模型计算了M+Ng的D_1和D_2谱线的碰撞展宽和位移，其中M=K，Rb，Cs和Ng=He，Ne，Ar。散射矩阵元是用通道包法计算的，其中碰撞是非绝热处理的，包括自旋-轨道耦合和科里奥利耦合。用分裂算符方法和绝热与非绝热表示之间的么正变换确定了非绝热波包动力学。散射相移差在能量范围从E=0.0075哈特里到E=0.0075哈特里的能量上进行热加权和积分，并在从J=0.5到J=400.5的总角动量值上求平均值。相移是线性外推的，以提供能量范围的近似扩展，直到E=0.012哈特里。得到了T=100K到T=800K温度范围内的展宽系数和位移系数，并与实验结果进行了比较。这项研究的预测在激光物理中得到了应用，特别是提高了光泵碱性激光系统的总功率输出。
Abstract : The Baranger model is used to compute collisional broadening and shift of the D1 and D2 spectral lines of M + Ng, where M = K, Rb, Cs and Ng = He, Ne, Ar, using scattering phase shift differences which are calculated from scattering matrix elements. Scattering matrix elements are calculated using the Channel Packet Method where the collisions are treated non-adiabatically and include spin-orbit and Coriolis couplings. Non-adiabatic wavepacket dynamics are determined using the split-operator method together with a unitary transformation between adiabatic and diabatic representations. Scattering phase shift differences are thermally weighted and integrated over energies ranging from E = 0 Hartree up to E = 0.0075 Hartree and averaged over values of total angular momentum that range from J = 0.5 up to J = 400.5. Phase shifts are extrapolated linearly to provide an approximate extension of the energy regime up to E = 0.012 Hartree. Broadening and shift coefficients are obtained for temperatures ranging from T = 100 K up to T = 800 K and compared with experiment. Predictions from this research find application in laser physics and specifically with improvement of total power output of Optically Pumped Alkali Laser systems.