Experimental Evidence that the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>6</mn><mi mathvariant="italic">s</mi><mn>6</mn><mi mathvariant="italic">p</mi><mrow><msup><mrow><mi></mi></mrow><mrow><mn>3</mn></mrow></msup></mrow><mrow><msub><mrow><mi mathvariant="italic">P</mi></mrow><mrow><mi mathvariant="italic">J</mi></mrow></msub></mrow></math></span> States of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>Cs</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math></span> Are Shape Resonances

M. Scheer; J. Thøgersen; R. C. Bilodeau; C. A. Brodie; H. K. Haugen; H. H. Andersen; P. Kristensen; T. Andersen

doi:10.1103/PhysRevLett.80.684

Experimental Evidence that the $6 s 6 p^{3} P_{J}$ States of ${Cs}^{-}$ Are Shape Resonances

M. Scheer, J. Thøgersen, R. C. Bilodeau, C. A. Brodie, H. K. Haugen, H. H. Andersen, P. Kristensen, and T. Andersen

Phys. Rev. Lett. 80, 684 – Published 26 January 1998

Abstract

An experimental study of the previously unobserved and controversial ${Cs}^{-} (6 s 6 p {}^{3}P_{J}^{o})$ states has been conducted using a combination of infrared laser and storage ring experiments. This first application of photodetachment spectroscopy to the study of low-lying resonances in atomic negative ions has resulted in the observation of a narrow resonance structure, lying only 8.0(3) meV above the first detachment threshold of ${Cs}^{-}$ . The storage ring experiments suggest that all fine structure levels of the $6 s 6 p$ configuration are unbound, thereby eliminating possibly the only serious candidate for a stable atomic negative ion with opposite parity bound states.

Received 23 June 1997

DOI:https://doi.org/10.1103/PhysRevLett.80.684

Authors & Affiliations

M. Scheer, J. Thøgersen^*, R. C. Bilodeau, C. A. Brodie, and H. K. Haugen^†

Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada

H. H. Andersen, P. Kristensen, and T. Andersen

Institute of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark

^*Present address: Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark
^†Also with the Department of Engineering, the Brockhouse Institute for Materials Research, and the Center for Electrophotonic Materials and Devices.