Abstract

The optogalvanic spectrum of tantalum in the 6200–5600-Å range has been observed with a cw dye laser and a tantalum hollow cathode. With a single-frequency dye laser as the excitation source, we performed high-resolution Doppler-limited laser optogalvanic spectroscopic experiments in a tantalum–argon hollow-cathode discharge lamp to study the hyperfine structure of four allowed transitions of neutral 181Ta. The corresponding hyperfine coupling constants A and B for eight levels were derived from the observed spectra. The A and B constants for the levels a4P5/2, a6D9/2, zF61/2,zD65/2, and zF611/2 are being reported for the first time to our knowledge.

© 1993 Optical Society of America

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