Abstract

The spectrum of neutral indium has been studied in the infrared region by means of the Fourier-transform spectrometer at the Laboratoire Aime Cotton, Orsay, France. A microwave-excited discharge tube containing indium iodide was used as the light source. A total of ten hyperfine structures was studied. Precise measurements of the center of gravity of the structures give energy levels with an error less than 0.005 cm−1. Complete analysis of these hyperfine structures resulted in the determination of the magnetic-dipole and electric-quadrupole interaction constants for one odd and four even levels. The observation also resulted in the measurements of 57 lines in the region of 0.86–4.0 μm, and, of these, 41 lines were observed for the first time to our knowledge.

© 1990 Optical Society of America

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