We have observed a threshold in the electron photodetachment cross section of ⁸⁸Sr^- ions at a photon energy hν0ex0ex=0ex0ex1.820eV and assign it to a p-wave transition from the 5s²5p²P ground state in Sr^- to the 5s5p³P state in neutral Sr. The measurement was made with a new technique combining the tunable laser photodetachment threshold method with accelerator mass spectrometry. We determine for the first time the electron affinity of Sr to be 48±6meV, much smaller than predicted in recent calculations. The ²P1/2- ²P3/2 fine splitting of the Sr^- ground state is estimated to be 26±8meV.
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Berkovits et al. (1995) studied this question.
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