Identification of New Hot Bands in the Blue and Green Band Systems of FeH

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• 作者：Wilson ; Catherine ; Brown ; John M.
• 刊名：Journal of Molecular Spectroscopy
• 出版年：1999
• 出版时间：October, 1999
• 年：1999
• 卷：197
• 期：2
• 页码：188-198
• 全文大小：271 K

文摘

A particularly rich region of the electronic spectrum of FeH from 525 to 545 nm was investigated using the techniques of dispersed and undispersed laser-induced fluorescence. Analysis has led to the discovery that several different electronic transitions are embedded in this region; the (0, 0) and (1, 1) bands of the e⁶Π–a⁶Δ (green) system, the (0, 2) band of the g⁶Φ–X⁴Δ (intercombination) system, the (0, 1) band of the g⁶Φ–a⁶Δ (blue) system, and the (0, 0) band of the g⁶Φ–b⁶Π system. Seventy-five lines were assigned in the (0, 1) band of the g⁶Φ–a⁶Δ transition. These, with the assignment of an additional 14 lines in the 583 nm region to the (0, 1) band of the e⁶Π–a⁶Δ transition, led to the extension of the known term values to higher J values for the Ω = 9/2, 7/2, and 5/2 spin components of the v = 1 level of the a⁶Δ state and the novel characterization of the a⁶Δ_3/2 (v = 1) and g⁶Φ_5/2 (v = 0) components. A further 73 lines were assigned to the first four subbands of the (1, 1) band of the e⁶Π–a⁶Δ transition and term values for the lowest four spin components of the v = 1 level of the e⁶Π state were determined. This provides the first experimental measurement of a vibrational interval in one of the higher lying electronic states of FeH. The interval does not appear to vary strongly between the spin components (ΔG_1/2 = 1717, 1713, 1710 cm⁻¹ for Ω = 7/2, 5/2, 3/2, respectively). Remarkably few of the hot-band transitions assigned in this work could be identified in the complex, high-temperature spectrum of FeH recorded by P. McCormack and S. O'Connor [Astron. Astrophys. Suppl. 26, 373–380 (1976)].