Phys. Rev. Lett. 68, 2281–2284 (1992)Shape resonance in Ca- photodetachment and the electron affinity of Ca(1S)Received 3 December 1991; published in the issue dated 13 April 1992 It was only recently found that a stable negative ion Ca- 2P exists below the Ca(1S) ground state. An electron affinity of 43±7 meV was obtained experimentally, and numerous theoretical calculations have now found values between 0 and 100 meV. We report the first photodetachment threshold measurements on Ca-, which display a p-wave threshold above Ca 4s4p 3P and a large p-wave shape resonance above Ca 4s4p 1P. Both threshold energies obtained from the data agree with a new electron affinity of 18.4±2.5 meV for Ca(1S). © 1992 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.68.2281
DOI:
10.1103/PhysRevLett.68.2281
PACS:
32.80.Fb, 34.80.Bm, 35.10.Hn
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