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The isotopes shifts of nine molybdenum lines between the levels (4d⁴5s²)a⁵D-(4d⁵5p)z⁵P have been studied in a newly developed hollow-cathode discharge tube with Doppler-free intermodulated fluorescence and optogalvanic spectroscopy. A homogeneous linewidth of 25 MHz is observed. The isotope shifts are determined with an accuracy of 2 MHz. This is an improvement of approximately one order of magnitude compared to previous measurements. Our results for the isotope shifts agree with previous results of Doppler-limited measurements within the error limits.
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Siegel et al. (1981) studied this question.
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