Radiative and Collisional Atomic Data for Singly Ionized Iron (FEII)

研究人员将进行理论计算， 辐射跃迁几率和碰撞散射 离子Fe+的横截面。 来自这个离子的谱线占主导地位 并使许多天体物理光谱复杂化。 使用Cray 2 计算机的精确度比以前任何计算机都要高得多 项目 大多数关于恒星的信息都来自对它们的分析。 谱 但许多恒星的光谱是复杂的， 由于铁离子Fe+的光谱线。 纠正这些线条 需要详细计算Fe+的原子水平， 它们之间的各种过渡。 计算所需的 通过使用克雷2超级计算机，现在可以实现精确度。 普拉丹有计算机代码和有用的国家和 国际合作需要完成这一计算 根据目前的补助金。

The investigators will carry out theoretical calculations of radiative transition probabilities and collisional scattering cross sections for the ion Fe+. The lines from this ion dominate and complicate many astrophysical spectra. Use of a Cray 2 computer allows vastly greater accuracy than any previous projects. Most information about stars is derived from an analysis of their spectra. But many stellar spectra are complicated by hundreds of spectrum lines due to the iron ion Fe+. Correction of these lines requires a detailed calculation of the atomic levels of Fe+ and various transitions between them. A calculation of the required accuracy is now possible by use of a Cray 2 supercomputer. Pradhan has the computer codes and helpful national and international collaborations needed to accomplish this calculation under the present grant.