The SiH Formula Band in the Fraunhofer Spectrum

Abstract
Low noise photoelectric scans of the solar disc and sunspot spectra are examined for lines attributable to the (0, 0) band of the SiH system |${A}^{2}\,\Delta-{X}^{2}\,\Pi$|⁠. Satisfactory identifications are established. A model atmosphere calculation provides a result for the band oscillator strength: f00 = 0.0045. Isotope shifts are calculated for the less abundant species, Si29H and Si30H. It is shown that the isotopic abundances are probably normal.

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