Observation of low-lying resonance states of [Formula Presented] at the [Formula Presented]S and [Formula Presented]S He thresholds

We measured the cusp electron production associated with target ionization at the impact of a 400-keV pure2[Formula Presented]S He beam and a mixed beam containing all three long-lived He states, i.e., 1[Formula Presented]S,n2[Formula Presented]S, and 2[Formula Presented]S. Using the results of an e...

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Autores principales: Báder, A., Sarkadi, L., Víkor, L., Kuzel, M., Závodszky, P.A., Jalowy, T., Groeneveld, K.O., Macri, P.A., Barrachina, R.O.
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Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10502947_v55_n1_pR14_Bader
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_10502947_v55_n1_pR14_Bader2023-10-03T15:59:02Z Observation of low-lying resonance states of [Formula Presented] at the [Formula Presented]S and [Formula Presented]S He thresholds Báder, A. Sarkadi, L. Víkor, L. Kuzel, M. Závodszky, P.A. Jalowy, T. Groeneveld, K.O. Macri, P.A. Barrachina, R.O. We measured the cusp electron production associated with target ionization at the impact of a 400-keV pure2[Formula Presented]S He beam and a mixed beam containing all three long-lived He states, i.e., 1[Formula Presented]S,n2[Formula Presented]S, and 2[Formula Presented]S. Using the results of an earlier experiment [Kuzel et al., Phys. Rev. A 48, R1745 (1993)], we estimated the cross section for both metastable states of He. We found that the cusp for the 2[Formula Presented]S state is much larger and sharper than for the 2[Formula Presented]S state. The peaks are manifestations of excitation of low-lying virtual or weakly bound states of the [Formula Presented] ion at the 2[Formula Presented]S and 2[Formula Presented]S thresholds. © 1997 The American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10502947_v55_n1_pR14_Bader
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We measured the cusp electron production associated with target ionization at the impact of a 400-keV pure2[Formula Presented]S He beam and a mixed beam containing all three long-lived He states, i.e., 1[Formula Presented]S,n2[Formula Presented]S, and 2[Formula Presented]S. Using the results of an earlier experiment [Kuzel et al., Phys. Rev. A 48, R1745 (1993)], we estimated the cross section for both metastable states of He. We found that the cusp for the 2[Formula Presented]S state is much larger and sharper than for the 2[Formula Presented]S state. The peaks are manifestations of excitation of low-lying virtual or weakly bound states of the [Formula Presented] ion at the 2[Formula Presented]S and 2[Formula Presented]S thresholds. © 1997 The American Physical Society.
format JOUR
author Báder, A.
Sarkadi, L.
Víkor, L.
Kuzel, M.
Závodszky, P.A.
Jalowy, T.
Groeneveld, K.O.
Macri, P.A.
Barrachina, R.O.
spellingShingle Báder, A.
Sarkadi, L.
Víkor, L.
Kuzel, M.
Závodszky, P.A.
Jalowy, T.
Groeneveld, K.O.
Macri, P.A.
Barrachina, R.O.
Observation of low-lying resonance states of [Formula Presented] at the [Formula Presented]S and [Formula Presented]S He thresholds
author_facet Báder, A.
Sarkadi, L.
Víkor, L.
Kuzel, M.
Závodszky, P.A.
Jalowy, T.
Groeneveld, K.O.
Macri, P.A.
Barrachina, R.O.
author_sort Báder, A.
title Observation of low-lying resonance states of [Formula Presented] at the [Formula Presented]S and [Formula Presented]S He thresholds
title_short Observation of low-lying resonance states of [Formula Presented] at the [Formula Presented]S and [Formula Presented]S He thresholds
title_full Observation of low-lying resonance states of [Formula Presented] at the [Formula Presented]S and [Formula Presented]S He thresholds
title_fullStr Observation of low-lying resonance states of [Formula Presented] at the [Formula Presented]S and [Formula Presented]S He thresholds
title_full_unstemmed Observation of low-lying resonance states of [Formula Presented] at the [Formula Presented]S and [Formula Presented]S He thresholds
title_sort observation of low-lying resonance states of [formula presented] at the [formula presented]s and [formula presented]s he thresholds
url http://hdl.handle.net/20.500.12110/paper_10502947_v55_n1_pR14_Bader
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