New Ritz wavelengths and transition probabilities for parity-forbidden, singly ionized nickel [Ni ii ] lines of astrophysical interest
New Ritz wavelengths and transition probabilities for parity-forbidden, singly ionized nickel [Ni ii ] lines of astrophysical interest
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天体物理学感兴趣的宇称禁止单电离镍 [Ni ii ] 谱线的新里兹波长和跃迁概率
DOI：
10.1093/mnras/stac3739
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发表时间：
2023
影响因子：
4.8
通讯作者：
Clear C
中科院分区：
文献类型：
--
作者：
Clear C
我们报告了宇称禁止 [Niii] 跃迁的准确 Ritz 波长，这些波长源自使用高分辨率傅里叶变换光谱确定的能级。偶宇称的 18 个最低 Niii 能级之间的跃迁产生了 126 个宇称禁线的里兹波长。这项工作中得出的里兹波长的不确定性比之前发布的值低两个数量级。使用半经验正交算子方法计算转移概率，不确定性范围从强 M1 线的大约 1% 到弱 E2 线的高达 10%。准确的禁线波长和跃迁概率，特别是红外线，对于低密度天体物理等离子体（例如超新星遗迹、行星状星云和活动星系核）的分析非常重要。
We report accurate Ritz wavelengths for parity-forbidden [Niii] transitions, derived from energy levels determined using high-resolution Fourier transform spectroscopy. Transitions between the 18 lowest Niiienergy levels of even-parity produced Ritz wavelengths for 126 parity-forbidden lines. Uncertainties for the Ritz wavelengths derived in this work are up to two orders of magnitude lower than previously published values. Transition probabilities were calculated using the semi-empirical orthogonal operator method, with uncertainties ranging from approximately 1 per cent for strong M1 lines and up to 10 per cent for weak E2 lines. Accurate forbidden line wavelengths and transition probabilities, particularly for lines in the infrared, are important in the analyses of low-density astrophysical plasmas, such as supernova remnants, planetary nebulae, and active galactic nuclei.