Abstract

We have measured the isotopic shifts of the ³S(3s6s)–³P(3s3p) and ³S(3s7s)–³P(3s3p) transitions of Mg i and the values of the hyperfine-structure constant A(³S₁) for the 3s6s and 3s7s terms of ²⁵Mg. The absolute wavelengths have been measured at an accuracy level of ±3 × 10⁻⁷, mainly limited by the Doppler broadening of the I₂ transitions used as a reference and by the precision of the knowledge of the related wavelengths. The measurements have been performed in an atomic beam rich in metastable atoms by scanning a ring dye laser and observing simultaneously the fluorescence of the beam.

© 1991 Optical Society of America

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