Shape resonance in K-shell photodetachment from C^–

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C. W. Walter,¹ N. D. Gibson,¹ R. C. Bilodeau,^2,3 N. Berrah,² J. D. Bozek,³ G. D. Ackerman,³ and A. Aguilar⁴
¹Department of Physics and Astronomy, Denison University, Granville, Ohio 43023, USA
²Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA
³Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
⁴Department of Physics, MS 220, University of Nevada, Reno, Nevada 89557, USA

Received 30 March 2006; published 1 June 2006

Thecore-excited (1s2s²2p⁴ ⁴P) negative ion shape resonance of C^– near 281.7 eVhas been investigated using the merged ion beam—photon beam photodetachmenttechnique on the Advanced Light Source beamline 10.0.1. C⁺ ionsformed by double detachment were detected as a function ofphoton energy. Higher resolution spectra yield more precise values forthe energy and width of the resonance than our previousmeasurements [N. D. Gibson et al., Phys. Rev. A 67, 030703(R)(2003)]. The absolute cross section for double detachment from C^–following 1s photoexcitation is measured for the first time andthe spectrum is compared to previous theoretical calculations. These measurementsalso provide information on the lowest core-excited state of neutralcarbon (1s2s²2p³ ⁵S).

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.062702
DOI:	10.1103/PhysRevA.73.062702
PACS:	32.80.Gc; 32.80.Hd 32.80.Gc Photodetachment of atomic negative ions 32.80.Hd Auger effect and inner-shell atomic excitation or ionization YEAR: 2006
KEYWORDS:	carbon, negative ions, electron detachment, photoexcitation, excited states, atom-photon collisions

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