Abstract
The infrared emission spectrum of BI i has been studied in the lead sulfide region. A microwave-excited bismuth electrodeless-discharge source with neon carrier gas was used. A 1-m Czerny–Turner scanning spectrometer with two different gratings blazed for 1 and 2.5 μm was employed. A liquid-nitrogen-cooled lead sulfide detector was used with the usual amplifying and recording accessories. Neon, argon, krypton, and xenon standard lines were used for calibration. The observations resulted in the wavelength measurements of 41 lines in the region 1–2.5 μm, and, of these, 29 lines are classified as transitions among known energy levels. Previously, 16 lines were observed in this region, of which 11 were classified by earlier workers.
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