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Experimental and theoretical L-shell ionization cross sections of heavy atoms by impact of Si ions
We present a theoretical and experimental study of the subshell resolved L-shell ionization of relativistic targets such as 73Ta, 78Pt, 90Th, and 92U. The measurements of x-ray production cross sections by (84–140 MeV) Si+q ions (q = 8; 12), were held at the Inter-University Accelerator Centre of Ne...
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| Published in: | Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2020-11, Vol.176, p.108809, Article 108809 |
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| container_title | Radiation physics and chemistry (Oxford, England : 1993) |
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| creator | Oswal, M. Kumar, Sunil Singh, Udai Singh, Shashank Singh, G. Singh, K.P. Mehta, D. Mendez, A.M.P. Mitnik, D.M. Montanari, C.C. Mitra, D. Nandi, T. |
| description | We present a theoretical and experimental study of the subshell resolved L-shell ionization of relativistic targets such as 73Ta, 78Pt, 90Th, and 92U. The measurements of x-ray production cross sections by (84–140 MeV) Si+q ions (q = 8; 12), were held at the Inter-University Accelerator Centre of New Delhi. Multiple-hole fluorescence and Coster-Kronig yields were used to obtain the Li(i = 1–3) ionization cross sections from the measured x-ray production cross sections of Lℓ, Lα, and Lβ, Lη, and Lγ lines. The experimental results are compared with ab initio theoretical calculations by means of the shell-wise local plasma approximation (SLPA). This model uses the quantum dielectric formalism to obtain the total ionization cross sections from an initial ground state. The wave functions and binding energies of the different targets were obtained by solving the fully relativistic Dirac equation using the HULLAC code package. These calculations are based on first order perturbation theory with a central field, including Breit interaction and quantum electrodynamics corrections. The present SLPA ionization cross sections of the L-shell are found to be independent of the charge state of the Si ions. The experimental observations display also quite similar character if the correct mean projectile charge state inside the target is used for including the multiple ionization effect during ion-solid collisions. A general good agreement between the experimental measurements and full theoretical calculations supports the reliability of present results. The comparison also includes the well-known ECPSSR and ECUSAR semi empirical approximations. We noted that the ECUSAR results agree well with the SLPA, while the ECPSSR cross sections are rather low.
•Multiple ionization by ion-impact in solid is a long-lasting problem.•Charge state of ion-beam is normally used to calculate modified atomic parameters.•Whether charge state of ion-beam in the bulk or in the outgoing ions will be used.•If charge state in the bulk is used, theory represents the measurements very well.•Ionization cross-sections is estimated well by shellwise local plasma approximations. |
| doi_str_mv | 10.1016/j.radphyschem.2020.108809 |
| format | article |
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•Multiple ionization by ion-impact in solid is a long-lasting problem.•Charge state of ion-beam is normally used to calculate modified atomic parameters.•Whether charge state of ion-beam in the bulk or in the outgoing ions will be used.•If charge state in the bulk is used, theory represents the measurements very well.•Ionization cross-sections is estimated well by shellwise local plasma approximations.</description><identifier>ISSN: 0969-806X</identifier><identifier>EISSN: 1879-0895</identifier><identifier>DOI: 10.1016/j.radphyschem.2020.108809</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Dirac equation ; Fluorescence ; Heavy ions ; Ionization ; Ionization cross sections ; L-shell x-rays ; Mathematical analysis ; Multiple-ionization ; Perturbation theory ; Projectiles ; Quantum electrodynamics ; Relativistic effects ; Wave functions</subject><ispartof>Radiation physics and chemistry (Oxford, England : 1993), 2020-11, Vol.176, p.108809, Article 108809</ispartof><rights>2020 Elsevier Ltd</rights><rights>Copyright Elsevier BV Nov 2020</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c400t-66746a3aa7eb49c020dff5b446d027f18f8b98453c9f9b8ce984ecf8f223c0f93</citedby><cites>FETCH-LOGICAL-c400t-66746a3aa7eb49c020dff5b446d027f18f8b98453c9f9b8ce984ecf8f223c0f93</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,786,790,27957,27958</link.rule.ids></links><search><creatorcontrib>Oswal, M.</creatorcontrib><creatorcontrib>Kumar, Sunil</creatorcontrib><creatorcontrib>Singh, Udai</creatorcontrib><creatorcontrib>Singh, Shashank</creatorcontrib><creatorcontrib>Singh, G.</creatorcontrib><creatorcontrib>Singh, K.P.</creatorcontrib><creatorcontrib>Mehta, D.</creatorcontrib><creatorcontrib>Mendez, A.M.P.</creatorcontrib><creatorcontrib>Mitnik, D.M.</creatorcontrib><creatorcontrib>Montanari, C.C.</creatorcontrib><creatorcontrib>Mitra, D.</creatorcontrib><creatorcontrib>Nandi, T.</creatorcontrib><title>Experimental and theoretical L-shell ionization cross sections of heavy atoms by impact of Si ions</title><title>Radiation physics and chemistry (Oxford, England : 1993)</title><description>We present a theoretical and experimental study of the subshell resolved L-shell ionization of relativistic targets such as 73Ta, 78Pt, 90Th, and 92U. The measurements of x-ray production cross sections by (84–140 MeV) Si+q ions (q = 8; 12), were held at the Inter-University Accelerator Centre of New Delhi. Multiple-hole fluorescence and Coster-Kronig yields were used to obtain the Li(i = 1–3) ionization cross sections from the measured x-ray production cross sections of Lℓ, Lα, and Lβ, Lη, and Lγ lines. The experimental results are compared with ab initio theoretical calculations by means of the shell-wise local plasma approximation (SLPA). This model uses the quantum dielectric formalism to obtain the total ionization cross sections from an initial ground state. The wave functions and binding energies of the different targets were obtained by solving the fully relativistic Dirac equation using the HULLAC code package. These calculations are based on first order perturbation theory with a central field, including Breit interaction and quantum electrodynamics corrections. The present SLPA ionization cross sections of the L-shell are found to be independent of the charge state of the Si ions. The experimental observations display also quite similar character if the correct mean projectile charge state inside the target is used for including the multiple ionization effect during ion-solid collisions. A general good agreement between the experimental measurements and full theoretical calculations supports the reliability of present results. The comparison also includes the well-known ECPSSR and ECUSAR semi empirical approximations. We noted that the ECUSAR results agree well with the SLPA, while the ECPSSR cross sections are rather low.
•Multiple ionization by ion-impact in solid is a long-lasting problem.•Charge state of ion-beam is normally used to calculate modified atomic parameters.•Whether charge state of ion-beam in the bulk or in the outgoing ions will be used.•If charge state in the bulk is used, theory represents the measurements very well.•Ionization cross-sections is estimated well by shellwise local plasma approximations.</description><subject>Dirac equation</subject><subject>Fluorescence</subject><subject>Heavy ions</subject><subject>Ionization</subject><subject>Ionization cross sections</subject><subject>L-shell x-rays</subject><subject>Mathematical analysis</subject><subject>Multiple-ionization</subject><subject>Perturbation theory</subject><subject>Projectiles</subject><subject>Quantum electrodynamics</subject><subject>Relativistic effects</subject><subject>Wave functions</subject><issn>0969-806X</issn><issn>1879-0895</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNqNkE1LxDAQhoMouK7-h4jnrulXmhxlWT9gwYMK3kKaTmhK29Sku1h_van14NHT8M7MO8P7IHQdk01MYnrbbJyshnryqoZuk5Bk7jNG-AlaxazgEWE8P0UrwimPGKHv5-jC-4YQUrA8XaFy9zmAMx30o2yx7Cs81mAdjEYFvY98DW2Lje3NlxxDwcpZ77EHNSuPrcY1yOOE5Wg7j8sJm26QapwHL2Y2-kt0pmXr4eq3rtHb_e51-xjtnx-etnf7SGWEjBGlRUZlKmUBZcZVSFJpnZdZRiuSFDpmmpWcZXmquOYlUxAEKM10kqSKaJ6u0c1yd3D24wB-FI09uD68FEmWZ5Qxlidhiy9bP0EcaDGE-NJNIiZiRioa8QepmJGKBWnwbhcvhBhHA054ZaBXUBkXgIjKmn9c-Qbw1YcE</recordid><startdate>202011</startdate><enddate>202011</enddate><creator>Oswal, M.</creator><creator>Kumar, Sunil</creator><creator>Singh, Udai</creator><creator>Singh, Shashank</creator><creator>Singh, G.</creator><creator>Singh, K.P.</creator><creator>Mehta, D.</creator><creator>Mendez, A.M.P.</creator><creator>Mitnik, D.M.</creator><creator>Montanari, C.C.</creator><creator>Mitra, D.</creator><creator>Nandi, T.</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>202011</creationdate><title>Experimental and theoretical L-shell ionization cross sections of heavy atoms by impact of Si ions</title><author>Oswal, M. ; Kumar, Sunil ; Singh, Udai ; Singh, Shashank ; Singh, G. ; Singh, K.P. ; Mehta, D. ; Mendez, A.M.P. ; Mitnik, D.M. ; Montanari, C.C. ; Mitra, D. ; Nandi, T.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c400t-66746a3aa7eb49c020dff5b446d027f18f8b98453c9f9b8ce984ecf8f223c0f93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Dirac equation</topic><topic>Fluorescence</topic><topic>Heavy ions</topic><topic>Ionization</topic><topic>Ionization cross sections</topic><topic>L-shell x-rays</topic><topic>Mathematical analysis</topic><topic>Multiple-ionization</topic><topic>Perturbation theory</topic><topic>Projectiles</topic><topic>Quantum electrodynamics</topic><topic>Relativistic effects</topic><topic>Wave functions</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Oswal, M.</creatorcontrib><creatorcontrib>Kumar, Sunil</creatorcontrib><creatorcontrib>Singh, Udai</creatorcontrib><creatorcontrib>Singh, Shashank</creatorcontrib><creatorcontrib>Singh, G.</creatorcontrib><creatorcontrib>Singh, K.P.</creatorcontrib><creatorcontrib>Mehta, D.</creatorcontrib><creatorcontrib>Mendez, A.M.P.</creatorcontrib><creatorcontrib>Mitnik, D.M.</creatorcontrib><creatorcontrib>Montanari, C.C.</creatorcontrib><creatorcontrib>Mitra, D.</creatorcontrib><creatorcontrib>Nandi, T.</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Radiation physics and chemistry (Oxford, England : 1993)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Oswal, M.</au><au>Kumar, Sunil</au><au>Singh, Udai</au><au>Singh, Shashank</au><au>Singh, G.</au><au>Singh, K.P.</au><au>Mehta, D.</au><au>Mendez, A.M.P.</au><au>Mitnik, D.M.</au><au>Montanari, C.C.</au><au>Mitra, D.</au><au>Nandi, T.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Experimental and theoretical L-shell ionization cross sections of heavy atoms by impact of Si ions</atitle><jtitle>Radiation physics and chemistry (Oxford, England : 1993)</jtitle><date>2020-11</date><risdate>2020</risdate><volume>176</volume><spage>108809</spage><pages>108809-</pages><artnum>108809</artnum><issn>0969-806X</issn><eissn>1879-0895</eissn><abstract>We present a theoretical and experimental study of the subshell resolved L-shell ionization of relativistic targets such as 73Ta, 78Pt, 90Th, and 92U. The measurements of x-ray production cross sections by (84–140 MeV) Si+q ions (q = 8; 12), were held at the Inter-University Accelerator Centre of New Delhi. Multiple-hole fluorescence and Coster-Kronig yields were used to obtain the Li(i = 1–3) ionization cross sections from the measured x-ray production cross sections of Lℓ, Lα, and Lβ, Lη, and Lγ lines. The experimental results are compared with ab initio theoretical calculations by means of the shell-wise local plasma approximation (SLPA). This model uses the quantum dielectric formalism to obtain the total ionization cross sections from an initial ground state. The wave functions and binding energies of the different targets were obtained by solving the fully relativistic Dirac equation using the HULLAC code package. These calculations are based on first order perturbation theory with a central field, including Breit interaction and quantum electrodynamics corrections. The present SLPA ionization cross sections of the L-shell are found to be independent of the charge state of the Si ions. The experimental observations display also quite similar character if the correct mean projectile charge state inside the target is used for including the multiple ionization effect during ion-solid collisions. A general good agreement between the experimental measurements and full theoretical calculations supports the reliability of present results. The comparison also includes the well-known ECPSSR and ECUSAR semi empirical approximations. We noted that the ECUSAR results agree well with the SLPA, while the ECPSSR cross sections are rather low.
•Multiple ionization by ion-impact in solid is a long-lasting problem.•Charge state of ion-beam is normally used to calculate modified atomic parameters.•Whether charge state of ion-beam in the bulk or in the outgoing ions will be used.•If charge state in the bulk is used, theory represents the measurements very well.•Ionization cross-sections is estimated well by shellwise local plasma approximations.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.radphyschem.2020.108809</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Dirac equation Fluorescence Heavy ions Ionization Ionization cross sections L-shell x-rays Mathematical analysis Multiple-ionization Perturbation theory Projectiles Quantum electrodynamics Relativistic effects Wave functions |
| title | Experimental and theoretical L-shell ionization cross sections of heavy atoms by impact of Si ions |
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