Far-wing profile of photoabsorption spectra of Na(3s–3p) atoms perturbed by helium
Far-wing profile of photoabsorption spectra of Na(3s–3p) atoms perturbed by helium
复制标题
氦扰动的 Na(3s–3p) 原子光吸收光谱的远翼剖面
DOI：
10.1088/0953-4075/41/17/175102
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
M. Aubert
中科院分区：
文献类型：
--
作者：
K. Alioua;M. Bouledroua;A. Allouche;M. Aubert
从理论上研究了被磨碎的氦原子碰撞加宽D谱线所产生的钠光谱的远翼。在半经典和全量子力学方法的框架下，用从头算方法计算了所需的X2Σ+，A2Π和B2Σ+的势能曲线和跃迁偶极矩，确定了随温度变化的光吸收光谱。在500K到3000K的所有温度范围内，该剖面以自由-自由跃迁为主，计算表明蓝翼中存在X→B跃迁所致的卫星结构。当经典计算执行时，卫星出现在波长位置520 nm附近，而当它们执行量子力学计算时，出现在528 nm附近。计算结果与其他理论和实验结果吻合较好。
The far wings of the sodium spectra arising from the collisional broadening of the D lines by ground helium atoms are investigated theoretically. The required X2Σ+, A2Π and B2Σ+ potential-energy curves and transition dipole moments have been generated from ab initio CASSCF-MRCI calculations to determine, within the framework of the semiclassical and full quantum-mechanical approaches, the temperature-dependent photoabsorption spectra. The profile is dominated by the free–free transitions at all temperatures ranging from 500 K to 3000 K and the computations show the existence of a satellite structure in the blue wing attributed to the X → B transitions. The satellites occur around the wavelength position 520 nm when the calculations are performed classically and around 528 nm when they are performed quantum mechanically. The results are in good accordance with those produced by other theoretical and experimental works.