dorsal/arxiv
View SchemaPhotodetachment study of He^- quartet resonances below the He(n=3) thresholds
| Authors | Andreas E. Klinkmueller, G. Haeffler, D. Hanstorp, I. Yu. Kiyan, U. Berzinsh, D. J. Pegg |
|---|---|
| Categories | |
| ArXiv ID | physics/9801032 |
| URL | https://arxiv.org/abs/physics/9801032 |
| DOI | 10.1088/0953-4075/31/11/016 |
| Journal | Journal of Physics B, Vol. 31, pages 2549-2557, (1998) |
Abstract
The photodetachment cross section of He^- has been measured in the photon energy range 2.9 eV to 3.3 eV in order to investigate doubly excited states. Measurements were made channel specific by selectively detecting the residual He atoms left in a particular excited state following detachment. Three Feshbach resonances were found in the He(1s2p ^3P)+e^-(epsilon p) partial cross section: a ^4S resonance below the He(1s3s ^3S) threshold and two ^4P resonances below the He(1s3p ^3P) threshold. The measured energies of these doubly excited states are 2.959260(6) eV, 3.072(7) eV and 3.26487(4) eV. The corresponding widths are found to be 0.20(2) meV, 50(5) meV and 0.61(5) meV. The measured energies agree well with recent theoretical predictions for the 1s3s4s ^4S, 1s3p^2 ^4P and 1s3p4p ^4P states, respectively, but the widths deviate noticeably from calculations for 1s3p^2 ^4P and 1s3p4p ^4P states.
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"abstract": "The photodetachment cross section of He^- has been measured in the photon\nenergy range 2.9 eV to 3.3 eV in order to investigate doubly excited states.\nMeasurements were made channel specific by selectively detecting the residual\nHe atoms left in a particular excited state following detachment. Three\nFeshbach resonances were found in the He(1s2p ^3P)+e^-(epsilon p) partial cross\nsection: a ^4S resonance below the He(1s3s ^3S) threshold and two ^4P\nresonances below the He(1s3p ^3P) threshold. The measured energies of these\ndoubly excited states are 2.959260(6) eV, 3.072(7) eV and 3.26487(4) eV. The\ncorresponding widths are found to be 0.20(2) meV, 50(5) meV and 0.61(5) meV.\nThe measured energies agree well with recent theoretical predictions for the\n1s3s4s ^4S, 1s3p^2 ^4P and 1s3p4p ^4P states, respectively, but the widths\ndeviate noticeably from calculations for 1s3p^2 ^4P and 1s3p4p ^4P states.",
"arxiv_id": "physics/9801032",
"authors": [
"Andreas E. Klinkmueller",
"G. Haeffler",
"D. Hanstorp",
"I. Yu. Kiyan",
"U. Berzinsh",
"D. J. Pegg"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1088/0953-4075/31/11/016",
"journal_ref": "Journal of Physics B, Vol. 31, pages 2549-2557, (1998)",
"title": "Photodetachment study of He^- quartet resonances below the He(n=3) thresholds",
"url": "https://arxiv.org/abs/physics/9801032"
},
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