Measurement of the Magnetic Properties of FeH in Its X4Δ and F4Δ States from Sunspot Spectra
Measurement of the Magnetic Properties of FeH in Its X4Δ and F4Δ States from Sunspot Spectra
复制标题
利用太阳黑子光谱测量 X4Δ 和 F4Δ 态 FeH 的磁性
DOI：
10.1086/591541
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
John M. Brown
中科院分区：
文献类型：
--
作者：
J. Harrison;John M. Brown
FeH在F4Δ和X4Δ态的自旋-转动能级受到附近电子态的显著扰动。因此，不可能从一个简单的有效哈密顿量中可靠地计算出它的磁偶极矩。本文报道了在F4Δ态和X4Δ态的v=0能级的两个最低自旋分量的几个转动能级中FeH的磁偶极矩的实验测量。观测数据取自Wallace等人的太阳黑子光谱地图集；局部磁通密度是由光谱中存在的原子线的分裂确定的。这些结果极大地扩展了FeH的已知磁偶极矩范围，并为天文学家提供了F4Δ-X4Δ跃迁中990 nm处的许多谱线，供天文学家用来测量冷星的局部磁场，而这些地方没有合适的原子线可供测量。
The spin-rotational levels of FeH in its F4Δ and X4Δ states are significantly perturbed by nearby electronic states. As a result, it is not possible to make reliable calculations of its magnetic dipole moments from a simple effective Hamiltonian. In this paper, we report experimental measurements of the magnetic dipole moments of FeH in several rotational levels of the two lowest spin components of the v = 0 levels of both the F4Δ and X4Δ states. The observational data are taken from the Sunspot Spectral Atlas of Wallace et al.; the local magnetic flux densities are determined from the splittings of atomic lines present in the spectrum. These results considerably extend the range of known magnetic dipole moments for FeH and provide many lines in the F4Δ–X4Δ transition at 990 nm (the Wing-Ford system) for astronomers to use for the measurement of the local magnetic fields of cool stars where suitable atomic lines are not available for this purpose.