Observation of the 2S1/2 metastable state in Pt−
Journal article, 2009

We have experimentally investigated the structure of the Pt− ion using laser photodetachment threshold spectroscopy. The experiment was conducted using a collinear laser-ion beam apparatus, in which the residual atoms created in the photodetachment process were detected. A p-wave threshold was observed in the photo- detachment spectrum at an energy of 6851͑13͒ cm−1. We conclude that this onset originates from a photode- tachment transition in which the initial state of Pt− is the previously unobserved 5d106s 2S1/2 state and the final state of Pt is the 5d96s 3D3 ground state. The excitation energy of the 2S1/2 state is determined to be 10 289͑13͒ cm−1. This value can be compared with a multiconfiguration Dirac-Fock calculation performed by Thøgersen et al. ͓Phys. Rev. Lett. 76, 2870 ͑1996͔͒, which yielded an excitation energy of 11 301 cm−1. Our data show no indication of the presence of any other state of Pt−. We conclude that the structure of the Pt− ion is now fully known.


Negative Ion

Laser photodetachment threshold spectroscopy


Pontus Andersson

University of Gothenburg

Anton Lindahl

University of Gothenburg

Dag Hanstorp

University of Gothenburg

D. J. Pegg

Physical Review A - Atomic, Molecular, and Optical Physics

1050-2947 (ISSN) 1094-1622 (eISSN)

Vol. 79 022502 -

Subject Categories

Physical Sciences

Atom and Molecular Physics and Optics



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