Electron impact excitation of methane: determination of appearance energies for dissociation products
In this work, we present an experimental study of dissociative excitation of CH4 utilizing a crossed electron molecular beam experiment. Methane was excited by nearly monochromatic electrons generated by a trochoidal electron monochromator. The dissociative products were identified on the basis of t...
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| Veröffentlicht in: | Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2013-02, Vol.46 (4), p.45203-1-10 |
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| container_title | Journal of physics. B, Atomic, molecular, and optical physics |
| container_volume | 46 |
| creator | Danko, M Orszagh, J urian, M Ko išek, J Daxner, M Zöttl, S Maljkovi, J B Fedor, J Scheier, P Denifl, S Matej ík, Š |
| description | In this work, we present an experimental study of dissociative excitation of CH4 utilizing a crossed electron molecular beam experiment. Methane was excited by nearly monochromatic electrons generated by a trochoidal electron monochromator. The dissociative products were identified on the basis of the emission spectra in the ultraviolet-visible (UV VIS) spectral range. The excitation functions were recorded as the function of the electron energy for different emission bands of the fragments (Balmer series for H: n = 3,4...9→2, and moreover, CH: A2Δ→X2Π, CH: B2Σ−→ X2Π, CH: C2Σ+→ X2Π, CH+: B1Δ→ A1Π, and CI: 2p3s 1Po1→2p2 1S0). From the experimental data we have determined the threshold energies for excitation of particular fragments. Present experimental results indicate that the threshold energies for some dissociative excitation channels could be lower by ∼1-2 eV in comparison to earlier studies and indicate that different dissociative processes may be operative at the threshold than assumed in the former studies. |
| doi_str_mv | 10.1088/0953-4075/46/4/045203 |
| format | Article |
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Methane was excited by nearly monochromatic electrons generated by a trochoidal electron monochromator. The dissociative products were identified on the basis of the emission spectra in the ultraviolet-visible (UV VIS) spectral range. The excitation functions were recorded as the function of the electron energy for different emission bands of the fragments (Balmer series for H: n = 3,4...9→2, and moreover, CH: A2Δ→X2Π, CH: B2Σ−→ X2Π, CH: C2Σ+→ X2Π, CH+: B1Δ→ A1Π, and CI: 2p3s 1Po1→2p2 1S0). From the experimental data we have determined the threshold energies for excitation of particular fragments. Present experimental results indicate that the threshold energies for some dissociative excitation channels could be lower by ∼1-2 eV in comparison to earlier studies and indicate that different dissociative processes may be operative at the threshold than assumed in the former studies.</description><identifier>ISSN: 0953-4075</identifier><identifier>EISSN: 1361-6455</identifier><identifier>DOI: 10.1088/0953-4075/46/4/045203</identifier><identifier>CODEN: JPAPEH</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Atomic and molecular collision processes and interactions ; Atomic and molecular physics ; Bands ; Channels ; dissociative excitation ; electron impact ; Electron scattering ; Energy of dissociation ; Exact sciences and technology ; Excitation ; excitation function ; fluorescence spectrum ; Fragments ; Methane ; Molecular excitation and ionization by electron impact ; Physics ; Spectral emissivity ; threshold energy ; Thresholds</subject><ispartof>Journal of physics. B, Atomic, molecular, and optical physics, 2013-02, Vol.46 (4), p.45203-1-10</ispartof><rights>2013 IOP Publishing Ltd</rights><rights>2014 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c405t-69ef0b9d56f75741607b80f27271872c5f528faae867027fb41522683ebb9ae83</citedby><cites>FETCH-LOGICAL-c405t-69ef0b9d56f75741607b80f27271872c5f528faae867027fb41522683ebb9ae83</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.1088/0953-4075/46/4/045203/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>314,780,784,27924,27925,53846,53893</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=27059288$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Danko, M</creatorcontrib><creatorcontrib>Orszagh, J</creatorcontrib><creatorcontrib>urian, M</creatorcontrib><creatorcontrib>Ko išek, J</creatorcontrib><creatorcontrib>Daxner, M</creatorcontrib><creatorcontrib>Zöttl, S</creatorcontrib><creatorcontrib>Maljkovi, J B</creatorcontrib><creatorcontrib>Fedor, J</creatorcontrib><creatorcontrib>Scheier, P</creatorcontrib><creatorcontrib>Denifl, S</creatorcontrib><creatorcontrib>Matej ík, Š</creatorcontrib><title>Electron impact excitation of methane: determination of appearance energies for dissociation products</title><title>Journal of physics. B, Atomic, molecular, and optical physics</title><addtitle>JPhysB</addtitle><addtitle>J. Phys. B: At. Mol. Opt. Phys</addtitle><description>In this work, we present an experimental study of dissociative excitation of CH4 utilizing a crossed electron molecular beam experiment. Methane was excited by nearly monochromatic electrons generated by a trochoidal electron monochromator. The dissociative products were identified on the basis of the emission spectra in the ultraviolet-visible (UV VIS) spectral range. The excitation functions were recorded as the function of the electron energy for different emission bands of the fragments (Balmer series for H: n = 3,4...9→2, and moreover, CH: A2Δ→X2Π, CH: B2Σ−→ X2Π, CH: C2Σ+→ X2Π, CH+: B1Δ→ A1Π, and CI: 2p3s 1Po1→2p2 1S0). From the experimental data we have determined the threshold energies for excitation of particular fragments. Present experimental results indicate that the threshold energies for some dissociative excitation channels could be lower by ∼1-2 eV in comparison to earlier studies and indicate that different dissociative processes may be operative at the threshold than assumed in the former studies.</description><subject>Atomic and molecular collision processes and interactions</subject><subject>Atomic and molecular physics</subject><subject>Bands</subject><subject>Channels</subject><subject>dissociative excitation</subject><subject>electron impact</subject><subject>Electron scattering</subject><subject>Energy of dissociation</subject><subject>Exact sciences and technology</subject><subject>Excitation</subject><subject>excitation function</subject><subject>fluorescence spectrum</subject><subject>Fragments</subject><subject>Methane</subject><subject>Molecular excitation and ionization by electron impact</subject><subject>Physics</subject><subject>Spectral emissivity</subject><subject>threshold energy</subject><subject>Thresholds</subject><issn>0953-4075</issn><issn>1361-6455</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqFkEtLxDAQgIMouK7-BKEXwUvdJM2r3mTxBQte9BzS7ESztE1NsqD_3pYue_U0MPPN60PomuA7gpVa4ZpXJcOSr5hYsRVmnOLqBC1IJUgpGOenaHFkztFFSjuMCVEULxA8tmBzDH3hu8HYXMCP9dlkP2aCKzrIX6aH-2ILGWLn-2PFDAOYaHoLBfQQPz2kwoVYbH1KwfqZG2LY7m1Ol-jMmTbB1SEu0cfT4_v6pdy8Pb-uHzalZZjnUtTgcFNvuXCSS0YElo3CjkoqiZLUcsepcsaAEhJT6RpGOKVCVdA09Zitluh2njsu_t5DyrrzyULbjj-EfdKkYjWreM3kiPIZtTGkFMHpIfrOxF9NsJ606kmZnpRpJjTTs9ax7-awwiRrWjcp8OnYTCXmNVXTKWTmfBj0LuxjPz7-z-w_PJSHTg</recordid><startdate>20130228</startdate><enddate>20130228</enddate><creator>Danko, M</creator><creator>Orszagh, J</creator><creator>urian, M</creator><creator>Ko išek, J</creator><creator>Daxner, M</creator><creator>Zöttl, S</creator><creator>Maljkovi, J B</creator><creator>Fedor, J</creator><creator>Scheier, P</creator><creator>Denifl, S</creator><creator>Matej ík, Š</creator><general>IOP Publishing</general><general>Institute of Physics</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20130228</creationdate><title>Electron impact excitation of methane: determination of appearance energies for dissociation products</title><author>Danko, M ; Orszagh, J ; urian, M ; Ko išek, J ; Daxner, M ; Zöttl, S ; Maljkovi, J B ; Fedor, J ; Scheier, P ; Denifl, S ; Matej ík, Š</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c405t-69ef0b9d56f75741607b80f27271872c5f528faae867027fb41522683ebb9ae83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Atomic and molecular collision processes and interactions</topic><topic>Atomic and molecular physics</topic><topic>Bands</topic><topic>Channels</topic><topic>dissociative excitation</topic><topic>electron impact</topic><topic>Electron scattering</topic><topic>Energy of dissociation</topic><topic>Exact sciences and technology</topic><topic>Excitation</topic><topic>excitation function</topic><topic>fluorescence spectrum</topic><topic>Fragments</topic><topic>Methane</topic><topic>Molecular excitation and ionization by electron impact</topic><topic>Physics</topic><topic>Spectral emissivity</topic><topic>threshold energy</topic><topic>Thresholds</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Danko, M</creatorcontrib><creatorcontrib>Orszagh, J</creatorcontrib><creatorcontrib>urian, M</creatorcontrib><creatorcontrib>Ko išek, J</creatorcontrib><creatorcontrib>Daxner, M</creatorcontrib><creatorcontrib>Zöttl, S</creatorcontrib><creatorcontrib>Maljkovi, J B</creatorcontrib><creatorcontrib>Fedor, J</creatorcontrib><creatorcontrib>Scheier, P</creatorcontrib><creatorcontrib>Denifl, S</creatorcontrib><creatorcontrib>Matej ík, Š</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of physics. B, Atomic, molecular, and optical physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Danko, M</au><au>Orszagh, J</au><au>urian, M</au><au>Ko išek, J</au><au>Daxner, M</au><au>Zöttl, S</au><au>Maljkovi, J B</au><au>Fedor, J</au><au>Scheier, P</au><au>Denifl, S</au><au>Matej ík, Š</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Electron impact excitation of methane: determination of appearance energies for dissociation products</atitle><jtitle>Journal of physics. B, Atomic, molecular, and optical physics</jtitle><stitle>JPhysB</stitle><addtitle>J. Phys. B: At. Mol. Opt. Phys</addtitle><date>2013-02-28</date><risdate>2013</risdate><volume>46</volume><issue>4</issue><spage>45203</spage><epage>1-10</epage><pages>45203-1-10</pages><issn>0953-4075</issn><eissn>1361-6455</eissn><coden>JPAPEH</coden><abstract>In this work, we present an experimental study of dissociative excitation of CH4 utilizing a crossed electron molecular beam experiment. Methane was excited by nearly monochromatic electrons generated by a trochoidal electron monochromator. The dissociative products were identified on the basis of the emission spectra in the ultraviolet-visible (UV VIS) spectral range. The excitation functions were recorded as the function of the electron energy for different emission bands of the fragments (Balmer series for H: n = 3,4...9→2, and moreover, CH: A2Δ→X2Π, CH: B2Σ−→ X2Π, CH: C2Σ+→ X2Π, CH+: B1Δ→ A1Π, and CI: 2p3s 1Po1→2p2 1S0). From the experimental data we have determined the threshold energies for excitation of particular fragments. Present experimental results indicate that the threshold energies for some dissociative excitation channels could be lower by ∼1-2 eV in comparison to earlier studies and indicate that different dissociative processes may be operative at the threshold than assumed in the former studies.</abstract><cop>Bristol</cop><pub>IOP Publishing</pub><doi>10.1088/0953-4075/46/4/045203</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Atomic and molecular collision processes and interactions Atomic and molecular physics Bands Channels dissociative excitation electron impact Electron scattering Energy of dissociation Exact sciences and technology Excitation excitation function fluorescence spectrum Fragments Methane Molecular excitation and ionization by electron impact Physics Spectral emissivity threshold energy Thresholds |
| title | Electron impact excitation of methane: determination of appearance energies for dissociation products |
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