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Two-photon detachment spectroscopy of the Ir^- (5d⁸6s²³F₄) and Pt^- (5d⁹6s²²D5/2) ions is conducted using laser intensities ~10¹⁰ W/cm². Sharp resonances in the two-photon detachment yields, attributed to magnetic dipole transitions, are observed at photon energies of 7087.3±0.4 and 9740.9±0.5cm^-1 for Ir^- and Pt^-, respectively. Multiconfiguration Dirac-Fock calculations predict fine structure splittings of 6671 and 9535cm^-1 for Ir^- (J0ex0ex=0ex0ex4-3) and Pt^- (J0ex0ex=0ex0ex5/2-3/2), and A coefficients of 7 and 14s^-1, respectively, for the upper fine structure levels of the ions.
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Thøgersen et al. (1996) studied this question.
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