Abstract

Optical–optical double resonance spectroscopy has been applied to measure the hyperfine structure of spectral line pairs of atomic osmium in the visible wavelength range. In the experiments, enriched isotope samples of either 189Os or 187Os were used. In this way, the magnetic dipole hyperfine interaction constants of the odd isotope 187Os were determined for seven levels of even parity and two levels of odd parity.

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