Multifrequency (X-band to W-band) CW EPR of the organic free radical in petroleum asphaltene
Petroleum of Arabian and Colombian origin was studied by electron paramagnetic resonance (EPR) spectroscopy at X- (9 GHz), Q- (34 GHz) and W-bands (94 GHz). The experiments were performed at room temperature (about 300 K) and at 77 K (W-band only). The asymmetry in the lines corresponding to free ra...
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| Veröffentlicht in: | Applied magnetic resonance 2005-12, Vol.29 (4), p.569-575 |
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| creator | Di Mauro, E. Guedes, C. L. B. Nascimento, O. R. |
| description | Petroleum of Arabian and Colombian origin was studied by electron paramagnetic resonance (EPR) spectroscopy at X- (9 GHz), Q- (34 GHz) and W-bands (94 GHz). The experiments were performed at room temperature (about 300 K) and at 77 K (W-band only). The asymmetry in the lines corresponding to free radicals was observed more intensely in the W-band spectra. The values of the line width ΔH in the spectra increased linearly with the microwave frequency utilized in the EPR experiments. A mathematical simulation of the free radical signal for the EPR spectra in three bands with a set of parameters corresponding to a single species was attempted, but this was not exactly coincident with the experimental signals, suggesting that the hyperfine interaction of the unpaired electron with its neighborhood corresponds to more than one species of radical in the molecular structure of the petroleum asphaltene. |
| doi_str_mv | 10.1007/BF03166333 |
| format | Article |
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A mathematical simulation of the free radical signal for the EPR spectra in three bands with a set of parameters corresponding to a single species was attempted, but this was not exactly coincident with the experimental signals, suggesting that the hyperfine interaction of the unpaired electron with its neighborhood corresponds to more than one species of radical in the molecular structure of the petroleum asphaltene.</description><identifier>ISSN: 0937-9347</identifier><identifier>EISSN: 1613-7507</identifier><identifier>DOI: 10.1007/BF03166333</identifier><language>eng</language><publisher>Heidelberg: Springer Nature B.V</publisher><subject>Asphaltenes ; Electron paramagnetic resonance ; Free radicals ; Microwave frequencies ; Molecular structure ; Room temperature ; Spectra ; Superhigh frequencies</subject><ispartof>Applied magnetic resonance, 2005-12, Vol.29 (4), p.569-575</ispartof><rights>Springer 2005.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c259t-a7c4be6fc8e805413a1d8bb7b3514aaca44a4b0be664ceeadf5ac9bec34187763</citedby><cites>FETCH-LOGICAL-c259t-a7c4be6fc8e805413a1d8bb7b3514aaca44a4b0be664ceeadf5ac9bec34187763</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.proquest.com/docview/2917906823?pq-origsite=primo$$EHTML$$P50$$Gproquest$$H</linktohtml><link.rule.ids>314,780,784,21388,21389,21390,21391,23256,27924,27925,33530,33703,33744,34005,34314,43659,43787,43805,43953,44067,64385,64389,72469</link.rule.ids></links><search><creatorcontrib>Di Mauro, E.</creatorcontrib><creatorcontrib>Guedes, C. 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A mathematical simulation of the free radical signal for the EPR spectra in three bands with a set of parameters corresponding to a single species was attempted, but this was not exactly coincident with the experimental signals, suggesting that the hyperfine interaction of the unpaired electron with its neighborhood corresponds to more than one species of radical in the molecular structure of the petroleum asphaltene.</description><subject>Asphaltenes</subject><subject>Electron paramagnetic resonance</subject><subject>Free radicals</subject><subject>Microwave frequencies</subject><subject>Molecular structure</subject><subject>Room temperature</subject><subject>Spectra</subject><subject>Superhigh frequencies</subject><issn>0937-9347</issn><issn>1613-7507</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNpFkEFLwzAUx4MoOKcXP0HAiwrVZEmT9qhjU2GiiDIPQnlJX11H19QkPezbW53g6b3D7_9_vB8hp5xdccb09e2cCa6UEGKPjLjiItEp0_tkxHKhk1xIfUiOQlgzxtOM6xH5eOybWFcev3ps7ZaevycG2pJGR5e_2wWdLuns-YW6isYVUuc_oa0tHSJIPZS1hYbWLe0wetdgv6EQuhU0EVs8JgcVNAFP_uaYvM1nr9P7ZPF09zC9WSR2kuYxAW2lQVXZDDOWSi6Al5kx2oiUSwALUoI0bECUtIhQVinY3KAVkmdaKzEmZ7vezrvhjxCLtet9O5wsJjnXOVPZRAzU5Y6y3oXgsSo6X2_AbwvOih97xb898Q3PomEi</recordid><startdate>20051201</startdate><enddate>20051201</enddate><creator>Di Mauro, E.</creator><creator>Guedes, C. 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| subjects | Asphaltenes Electron paramagnetic resonance Free radicals Microwave frequencies Molecular structure Room temperature Spectra Superhigh frequencies |
| title | Multifrequency (X-band to W-band) CW EPR of the organic free radical in petroleum asphaltene |
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