中国物理B ›› 2006, Vol. 15 ›› Issue (7): 1502-1510.doi: 10.1088/1009-1963/15/7/021

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Theoretical simulations of emission spectra of Fe7+ and Fe8+

王雁桂1, 赵刚2, 曾交龙3, 袁建民3   

  1. (1)Department of Applied Physics, National University of Defense Technology, Changsha 410073, China; (2)National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012, China; (3)National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012, China；Department of Applied Physics, National University of Defense Technology, Changsha 410073, China
  • 收稿日期:2005-06-13 修回日期:2006-04-03 出版日期:2006-07-20 发布日期:2006-07-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10204024, 10373014, 10433010 and 10474138).

Theoretical simulations of emission spectra of Fe7+ and Fe8+

Zeng Jiao-Long (曾交龙)ab, Wang Yan-Gui (王雁桂)b, Zhao Gang (赵刚)a, Yuan Jian-Min (袁建民)ab   

  1. a National Astronomical Observatories,Chinese Academy of Sciences, Beijing 100012, China; b Department of Applied Physics, National University of Defense Technology, Changsha 410073, China
  • Received:2005-06-13 Revised:2006-04-03 Online:2006-07-20 Published:2006-07-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10204024, 10373014, 10433010 and 10474138).

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摘要： The energy levels, oscillator strengths, spontaneous radiative decay rates, and electron impact collision strengths are calculated for Fe VIII and Fe IX using the recently developed flexible atomic code (FAC). These atomic data are used to analyse the emission spectra of both laboratory and astrophysical plasmas. The {\it n}f--3d emission lines have been simulated for Fe VIII and Fe IX in a wavelength range of 6--14 nm. For Fe VIII, the predicted relative intensities of lines are insensitive to temperature. For Fe IX, however, the intensity ratios are very sensitive to temperature, implying that the information of temperature in the experiment can be inferred. Detailed line analyses have also been carried out in a wavelength range of 60--80 nm for Fe VIII, where the solar ultraviolet measurements of emitted radiation spectrometer records a large number of spectra. More lines can be identified with the aid of present atomic data. A complete dataset is available electronically from http://www.astrnomy.csdb.cn/EIE/.

关键词: emission spectrum, Fe VIII and Fe IX, electron impact excitation

Abstract: The energy levels, oscillator strengths, spontaneous radiative decay rates, and electron impact collision strengths are calculated for Fe VIII and Fe IX using the recently developed flexible atomic code (FAC). These atomic data are used to analyse the emission spectra of both laboratory and astrophysical plasmas. The nf--3d emission lines have been simulated for Fe VIII and Fe IX in a wavelength range of 6--14 nm. For Fe VIII, the predicted relative intensities of lines are insensitive to temperature. For Fe IX, however, the intensity ratios are very sensitive to temperature, implying that the information of temperature in the experiment can be inferred. Detailed line analyses have also been carried out in a wavelength range of 60--80 nm for Fe VIII, where the solar ultraviolet measurements of emitted radiation spectrometer records a large number of spectra. More lines can be identified with the aid of present atomic data. A complete dataset is available electronically from http://www.astrnomy.csdb.cn/EIE/.

Key words: emission spectrum, Fe VIII and Fe IX, electron impact excitation

中图分类号:  (Fluorescence, phosphorescence (including quenching))

  • 32.50.+d
31.15.-p (Calculations and mathematical techniques in atomic and molecular physics) 32.70.Cs (Oscillator strengths, lifetimes, transition moments) 32.70.Fw (Absolute and relative intensities) 34.80.Dp (Atomic excitation and ionization)