Merged-beams energy-loss technique for electron-ion excitation: Absolute total cross sections for O[sup 5+](2[ital s][r arrow]2[ital p])
A merged-beams electron-energy-loss technique is described, by which absolute cross sections can be measured for near-threshold electron-impact excitation of multipy charged ions. Results are reported here for absolute total electron-impact excitation cross sections for the O[sup 5+](2[ital s][r arr...
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| Veröffentlicht in: | Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 1994-06, Vol.49:6 |
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| container_title | Physical review. A, Atomic, molecular, and optical physics |
| container_volume | 49:6 |
| creator | Bell, E.W. Guo, X.Q. Forand, J.L. Rinn, K. Swenson, D.R. Thompson, J.S. Dunn, G.H. Bannister, M.E. Gregory, D.C. Phaneuf, R.A. Smith, A.C.H. Mueller, A. Timmer, C.A. Wahlin, E.K. DePaola, B.D. Belic, D.S. |
| description | A merged-beams electron-energy-loss technique is described, by which absolute cross sections can be measured for near-threshold electron-impact excitation of multipy charged ions. Results are reported here for absolute total electron-impact excitation cross sections for the O[sup 5+](2[ital s][r arrow]2[ital p]) transition from below threshold to 1.6 eV above threshold. The experimental data are in good agremeent with a seven-state close-coupling calculation throughout the energy range of the experiment. Results agree with calculations showing that more than 90% of the electrons causing excitation are ejected in the backward direction in the center-of-mass frame. This backscattering is shown in both quantum-mechanical and semiclassical calculations. Evidence is observed for high-lying metastable autoionizing states with a lifetime of approximately 0.9 [mu]s which are made to ionize by electron impact. |
| doi_str_mv | 10.1103/PhysRevA.49.4585 |
| format | Article |
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Results are reported here for absolute total electron-impact excitation cross sections for the O[sup 5+](2[ital s][r arrow]2[ital p]) transition from below threshold to 1.6 eV above threshold. The experimental data are in good agremeent with a seven-state close-coupling calculation throughout the energy range of the experiment. Results agree with calculations showing that more than 90% of the electrons causing excitation are ejected in the backward direction in the center-of-mass frame. This backscattering is shown in both quantum-mechanical and semiclassical calculations. 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A, Atomic, molecular, and optical physics</title><description>A merged-beams electron-energy-loss technique is described, by which absolute cross sections can be measured for near-threshold electron-impact excitation of multipy charged ions. Results are reported here for absolute total electron-impact excitation cross sections for the O[sup 5+](2[ital s][r arrow]2[ital p]) transition from below threshold to 1.6 eV above threshold. The experimental data are in good agremeent with a seven-state close-coupling calculation throughout the energy range of the experiment. Results agree with calculations showing that more than 90% of the electrons causing excitation are ejected in the backward direction in the center-of-mass frame. This backscattering is shown in both quantum-mechanical and semiclassical calculations. Evidence is observed for high-lying metastable autoionizing states with a lifetime of approximately 0.9 [mu]s which are made to ionize by electron impact.</description><subject>664300 - Atomic & Molecular Physics- Collision Phenomena- (1992-)</subject><subject>ATOMIC AND MOLECULAR PHYSICS</subject><subject>BACKSCATTERING</subject><subject>BEAMS</subject><subject>CHARGED PARTICLES</subject><subject>COLLISIONS</subject><subject>CROSS SECTIONS</subject><subject>ELECTRON BEAMS</subject><subject>ELECTRON COLLISIONS</subject><subject>ELECTRON SPECTROSCOPY</subject><subject>ELECTRON-ION COLLISIONS</subject><subject>ENERGY</subject><subject>ENERGY LOSSES</subject><subject>ENERGY RANGE</subject><subject>ENERGY-LEVEL TRANSITIONS</subject><subject>ENERGY-LOSS SPECTROSCOPY</subject><subject>EV RANGE</subject><subject>EXCITATION</subject><subject>ION BEAMS</subject><subject>ION COLLISIONS</subject><subject>IONS</subject><subject>LEPTON BEAMS</subject><subject>LOSSES</subject><subject>MULTICHARGED IONS</subject><subject>OXYGEN IONS</subject><subject>PARTICLE BEAMS</subject><subject>SCATTERING</subject><subject>SPECTROSCOPY</subject><subject>THRESHOLD ENERGY</subject><subject>TOTAL CROSS SECTIONS</subject><issn>1050-2947</issn><issn>1094-1622</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1994</creationdate><recordtype>article</recordtype><recordid>eNqNjsFOwzAMhiMEEmNw5xhxAqGUpE3oym2aQFwmEOJWVVMWPBYUkhGnwN6AxyZFewB88W_7-20Tcip4IQSvrh7XW3yCz2khm0KqidojI8EbycR1We4PWnFWNrI-JEeIbzyHnDQj8jOH-AovbAn6HSn4XG2ZC4g0gVl7-9EDXYVIwYFJMXhmg6fwbWzSKcsbOl1icH0CmkLSjpo4eDHDeYp_1ocW-w1Vl9152dqBwa6NVMcYvrpdZ9NdHJODlXYIJ7s8Jmd3t8-zexYw2QXmg_kfE7zPqxd1xWvFVfUv6BdkqFq4</recordid><startdate>19940601</startdate><enddate>19940601</enddate><creator>Bell, E.W.</creator><creator>Guo, X.Q.</creator><creator>Forand, J.L.</creator><creator>Rinn, K.</creator><creator>Swenson, D.R.</creator><creator>Thompson, J.S.</creator><creator>Dunn, G.H.</creator><creator>Bannister, M.E.</creator><creator>Gregory, D.C.</creator><creator>Phaneuf, R.A.</creator><creator>Smith, A.C.H.</creator><creator>Mueller, A.</creator><creator>Timmer, C.A.</creator><creator>Wahlin, E.K.</creator><creator>DePaola, B.D.</creator><creator>Belic, D.S.</creator><scope>OTOTI</scope></search><sort><creationdate>19940601</creationdate><title>Merged-beams energy-loss technique for electron-ion excitation: Absolute total cross sections for O[sup 5+](2[ital s][r arrow]2[ital p])</title><author>Bell, E.W. ; Guo, X.Q. ; Forand, J.L. ; Rinn, K. ; Swenson, D.R. ; Thompson, J.S. ; Dunn, G.H. ; Bannister, M.E. ; Gregory, D.C. ; Phaneuf, R.A. ; Smith, A.C.H. ; Mueller, A. ; Timmer, C.A. ; Wahlin, E.K. ; DePaola, B.D. ; Belic, D.S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-osti_scitechconnect_73075053</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1994</creationdate><topic>664300 - Atomic & Molecular Physics- Collision Phenomena- (1992-)</topic><topic>ATOMIC AND MOLECULAR PHYSICS</topic><topic>BACKSCATTERING</topic><topic>BEAMS</topic><topic>CHARGED PARTICLES</topic><topic>COLLISIONS</topic><topic>CROSS SECTIONS</topic><topic>ELECTRON BEAMS</topic><topic>ELECTRON COLLISIONS</topic><topic>ELECTRON SPECTROSCOPY</topic><topic>ELECTRON-ION COLLISIONS</topic><topic>ENERGY</topic><topic>ENERGY LOSSES</topic><topic>ENERGY RANGE</topic><topic>ENERGY-LEVEL TRANSITIONS</topic><topic>ENERGY-LOSS SPECTROSCOPY</topic><topic>EV RANGE</topic><topic>EXCITATION</topic><topic>ION BEAMS</topic><topic>ION COLLISIONS</topic><topic>IONS</topic><topic>LEPTON BEAMS</topic><topic>LOSSES</topic><topic>MULTICHARGED IONS</topic><topic>OXYGEN IONS</topic><topic>PARTICLE BEAMS</topic><topic>SCATTERING</topic><topic>SPECTROSCOPY</topic><topic>THRESHOLD ENERGY</topic><topic>TOTAL CROSS SECTIONS</topic><toplevel>online_resources</toplevel><creatorcontrib>Bell, E.W.</creatorcontrib><creatorcontrib>Guo, X.Q.</creatorcontrib><creatorcontrib>Forand, J.L.</creatorcontrib><creatorcontrib>Rinn, K.</creatorcontrib><creatorcontrib>Swenson, D.R.</creatorcontrib><creatorcontrib>Thompson, J.S.</creatorcontrib><creatorcontrib>Dunn, G.H.</creatorcontrib><creatorcontrib>Bannister, M.E.</creatorcontrib><creatorcontrib>Gregory, D.C.</creatorcontrib><creatorcontrib>Phaneuf, R.A.</creatorcontrib><creatorcontrib>Smith, A.C.H.</creatorcontrib><creatorcontrib>Mueller, A.</creatorcontrib><creatorcontrib>Timmer, C.A.</creatorcontrib><creatorcontrib>Wahlin, E.K.</creatorcontrib><creatorcontrib>DePaola, B.D.</creatorcontrib><creatorcontrib>Belic, D.S.</creatorcontrib><collection>OSTI.GOV</collection><jtitle>Physical review. A, Atomic, molecular, and optical physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bell, E.W.</au><au>Guo, X.Q.</au><au>Forand, J.L.</au><au>Rinn, K.</au><au>Swenson, D.R.</au><au>Thompson, J.S.</au><au>Dunn, G.H.</au><au>Bannister, M.E.</au><au>Gregory, D.C.</au><au>Phaneuf, R.A.</au><au>Smith, A.C.H.</au><au>Mueller, A.</au><au>Timmer, C.A.</au><au>Wahlin, E.K.</au><au>DePaola, B.D.</au><au>Belic, D.S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Merged-beams energy-loss technique for electron-ion excitation: Absolute total cross sections for O[sup 5+](2[ital s][r arrow]2[ital p])</atitle><jtitle>Physical review. A, Atomic, molecular, and optical physics</jtitle><date>1994-06-01</date><risdate>1994</risdate><volume>49:6</volume><issn>1050-2947</issn><eissn>1094-1622</eissn><abstract>A merged-beams electron-energy-loss technique is described, by which absolute cross sections can be measured for near-threshold electron-impact excitation of multipy charged ions. Results are reported here for absolute total electron-impact excitation cross sections for the O[sup 5+](2[ital s][r arrow]2[ital p]) transition from below threshold to 1.6 eV above threshold. The experimental data are in good agremeent with a seven-state close-coupling calculation throughout the energy range of the experiment. Results agree with calculations showing that more than 90% of the electrons causing excitation are ejected in the backward direction in the center-of-mass frame. This backscattering is shown in both quantum-mechanical and semiclassical calculations. Evidence is observed for high-lying metastable autoionizing states with a lifetime of approximately 0.9 [mu]s which are made to ionize by electron impact.</abstract><cop>United States</cop><doi>10.1103/PhysRevA.49.4585</doi></addata></record> |
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| source | American Physical Society Journals |
| subjects | 664300 - Atomic & Molecular Physics- Collision Phenomena- (1992-) ATOMIC AND MOLECULAR PHYSICS BACKSCATTERING BEAMS CHARGED PARTICLES COLLISIONS CROSS SECTIONS ELECTRON BEAMS ELECTRON COLLISIONS ELECTRON SPECTROSCOPY ELECTRON-ION COLLISIONS ENERGY ENERGY LOSSES ENERGY RANGE ENERGY-LEVEL TRANSITIONS ENERGY-LOSS SPECTROSCOPY EV RANGE EXCITATION ION BEAMS ION COLLISIONS IONS LEPTON BEAMS LOSSES MULTICHARGED IONS OXYGEN IONS PARTICLE BEAMS SCATTERING SPECTROSCOPY THRESHOLD ENERGY TOTAL CROSS SECTIONS |
| title | Merged-beams energy-loss technique for electron-ion excitation: Absolute total cross sections for O[sup 5+](2[ital s][r arrow]2[ital p]) |
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