The absorption of radiation near 600 Å by helium
The absorption of radiation near 600 Å by helium
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氦吸收近 600 Å 的辐射
DOI：
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发表时间：
1971
期刊：
影响因子：
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通讯作者：
A. Dalgarno
中科院分区：
文献类型：
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作者：
K. Sando;A. Dalgarno
本文讨论了原子对的自由束缚和自由-自由辐射吸收，导出了自由-束缚和自由-自由吸收截面的显式公式。该理论适用于解释氦吸收近600 A，它认为，观察到的前两个频带产生的准声共振振动能级的A 1 u +状态的过渡。导出了核间距在2 ~ 3a范围内的A1 ~（？）u +势能曲线的形状。通过对吸收数据的分析，得到了0·049 eV量级的势垒。预测了3 He取代4 He对吸收结构的影响。一个迭代的过程中描述，同时定位的能量和评估的宽度的准bound-shape共振态。
Free-bound and free-free radiative absorptions by a pair of atoms are discussed and explicit formulas are derived for the free-bound and free-free absorption cross sections. The theory is applied to the interpretation of helium absorption near 600 a and it is argued that the first two bands observed arise from transitions into quasibound resonating vibrational levels of the A 1Σ u + state. The shape of the A 1Σ u + potential energy curve is derived for internuclear distances between 2 and 3 a. The absorption data analysis lead to a potential barrier of magnitude 0·049 ev. The effects on the absorption structure of replacing 4He by 3He are predicted. An iterative procedure is described that simultaneously locates the energy and evaluates the width of a quasibound-shape resonance state.