{"title":"Two-pulse double quantum and five-pulse double-quantum modulation sequences in EPR: Coherence transfer and distance measurements","authors":"S. Misra, H. R. Salahi","doi":"10.26907/mrsej-21203","DOIUrl":"https://doi.org/10.26907/mrsej-21203","url":null,"abstract":"","PeriodicalId":18153,"journal":{"name":"Magnetic resonance in solids","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69163431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"NMR inversion echo analog in cobalt and lithium ferrite under the combined action of radiofrequency and magnetic pulses","authors":"G. Mamniashvili, T. Gegechkori, T. Gavasheli","doi":"10.26907/mrsej-21102","DOIUrl":"https://doi.org/10.26907/mrsej-21102","url":null,"abstract":"","PeriodicalId":18153,"journal":{"name":"Magnetic resonance in solids","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69163365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Modernization of the X-band EPR spectrometer Bruker ElexSys E580 for dynamic nuclear polarization","authors":"M. Gafurov, G. Mamin, D. Zverev","doi":"10.26907/mrsej-21202","DOIUrl":"https://doi.org/10.26907/mrsej-21202","url":null,"abstract":"","PeriodicalId":18153,"journal":{"name":"Magnetic resonance in solids","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69163417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We study the coherence times and perform manipulations on the lowest-energy states of trivalent cerium ion in calcium tungstate crystal. We find the phase memory time reaching 14.2 ${mu}$s and the time of coherent manipulations reaching 0.3 ${mu}$s in the low-temperature limit, the latter can potentially be elongated by using the rotation angle and off-resonance error correction schemes.
{"title":"Coherence times of Ce3+ spin states in CaWO4 crystal","authors":"M. Gafurov, I. Kurkin, E. Baibekov","doi":"10.26907/mrsej-19501","DOIUrl":"https://doi.org/10.26907/mrsej-19501","url":null,"abstract":"We study the coherence times and perform manipulations on the lowest-energy states of trivalent cerium ion in calcium tungstate crystal. We find the phase memory time reaching 14.2 ${mu}$s and the time of coherent manipulations reaching 0.3 ${mu}$s in the low-temperature limit, the latter can potentially be elongated by using the rotation angle and off-resonance error correction schemes.","PeriodicalId":18153,"journal":{"name":"Magnetic resonance in solids","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49655263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Batulin, M. Cherosov, I. Gilmutdinov, A. Kiiamov, V. Klekovkina, B. Malkin, A. Rodionov, R. Yusupov
The results of studies of Y$_{2}$Ti$_2$O$_7$ single crystals doped with Er$^{3+}$ and Yb$^{3+}$ ions by means of electron paramagnetic resonance (EPR) and dc-magnetometry are reported. EPR signals of the trigonal centers with the characteristic hyperfine structure of Er$^{3+}$ or Yb$^{3+}$ ions were observed. Field dependences of magnetization of single crystals for magnetic fields directed along the crystallographic axes and temperature dependences of magnetic susceptibilities were measured. Spin Hamiltonian parameters ($g$-factors and parameters of the hyperfine interaction) for Er$^{3+}$ and Yb$^{3+}$ ions were obtained from analysis of experimental data. The registered EPR spectra and magnetization curves were successfully reproduced by simulations in framework of the crystal-field approach, in particular, with an account for hybridization of ground 4f$^{13}$ configuration of Yb$^{3+}$ ions with the charge transfer states.
{"title":"EPR spectra and magnetization of XY-type rare-earth ions in pyrochlores Y2Ti2O7: RE3+ (RE=Yb, Er)","authors":"R. Batulin, M. Cherosov, I. Gilmutdinov, A. Kiiamov, V. Klekovkina, B. Malkin, A. Rodionov, R. Yusupov","doi":"10.26907/mrsej-19601","DOIUrl":"https://doi.org/10.26907/mrsej-19601","url":null,"abstract":"The results of studies of Y$_{2}$Ti$_2$O$_7$ single crystals doped with Er$^{3+}$ and Yb$^{3+}$ ions by means of electron paramagnetic resonance (EPR) and dc-magnetometry are reported. EPR signals of the trigonal centers with the characteristic hyperfine structure of Er$^{3+}$ or Yb$^{3+}$ ions were observed. Field dependences of magnetization of single crystals for magnetic fields directed along the crystallographic axes and temperature dependences of magnetic susceptibilities were measured. Spin Hamiltonian parameters ($g$-factors and parameters of the hyperfine interaction) for Er$^{3+}$ and Yb$^{3+}$ ions were obtained from analysis of experimental data. The registered EPR spectra and magnetization curves were successfully reproduced by simulations in framework of the crystal-field approach, in particular, with an account for hybridization of ground 4f$^{13}$ configuration of Yb$^{3+}$ ions with the charge transfer states.","PeriodicalId":18153,"journal":{"name":"Magnetic resonance in solids","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42520730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Gafurov, A. Galukhin, Y. Osin, F. Murzakhanov, I. Gracheva, G. Mamin, S. Orlinskii
Porous silica materials offer wide range of possibilities for enhancement of the productivity of oil reservoirs. However the mechanism of adsorption of polar components of crude oil on silica surface is poorly understood that hinders technological improvement of supports and oil extraction. We have synthesized opal films with the silica microspheres size of about 360 nm, specific surface area of 5.2 m2/g and pore size of 230 nm. We have fractionated and characterized oil and oil asphaltenes from heavy (Ashalchinskoe) oil. By pulsed electron paramagnetic resonance (EPR) and double electron nuclear resonance (ENDOR) in the W band frequency range (microwave frequency of 94 GHz, magnetic field of 3.4 T) we have studied the adsorption of oil asphaltenes on the surface of opal samples using the intrinsic for asphaltenes paramagnetic vanadylporphyrins (VO) complexes. 1H ENDOR spectra are found to be different for initial and the adsorbed samples in their central parts (that is a sign of asphaltenes VO disaggregation) whereas no significant changes in the W band EPR spectra were detected. Contrasting to alumina support, no strong electron proton interaction with the protons on the surface of SiO2 (presumably, silanol groups) was found and infiltration of the oiled opal films with gasoline changes the central part of 1H ENDOR spectra. It shows that the proton containing groups on the surface of amorphous SiO2 sample can significantly change the asphaltene adsorption properties and ENDOR of the intrinsic for oil paramagnetic centers could be used for the characterization of surface state in porous media in situ or operando.
{"title":"Probing the surface of synthetic opals with the vanadyl containing crude oil by using EPR and ENDOR techniques","authors":"M. Gafurov, A. Galukhin, Y. Osin, F. Murzakhanov, I. Gracheva, G. Mamin, S. Orlinskii","doi":"10.26907/mrsej-19101","DOIUrl":"https://doi.org/10.26907/mrsej-19101","url":null,"abstract":"Porous silica materials offer wide range of possibilities for enhancement of the productivity of oil reservoirs. However the mechanism of adsorption of polar components of crude oil on silica surface is poorly understood that hinders technological improvement of supports and oil extraction. We have synthesized opal films with the silica microspheres size of about 360 nm, specific surface area of 5.2 m2/g and pore size of 230 nm. We have fractionated and characterized oil and oil asphaltenes from heavy (Ashalchinskoe) oil. By pulsed electron paramagnetic resonance (EPR) and double electron nuclear resonance (ENDOR) in the W band frequency range (microwave frequency of 94 GHz, magnetic field of 3.4 T) we have studied the adsorption of oil asphaltenes on the surface of opal samples using the intrinsic for asphaltenes paramagnetic vanadylporphyrins (VO) complexes. 1H ENDOR spectra are found to be different for initial and the adsorbed samples in their central parts (that is a sign of asphaltenes VO disaggregation) whereas no significant changes in the W band EPR spectra were detected. Contrasting to alumina support, no strong electron proton interaction with the protons on the surface of SiO2 (presumably, silanol groups) was found and infiltration of the oiled opal films with gasoline changes the central part of 1H ENDOR spectra. It shows that the proton containing groups on the surface of amorphous SiO2 sample can significantly change the asphaltene adsorption properties and ENDOR of the intrinsic for oil paramagnetic centers could be used for the characterization of surface state in porous media in situ or operando.","PeriodicalId":18153,"journal":{"name":"Magnetic resonance in solids","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47494929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. S. Aleksandrov, A. Egorov, S. Korableva, M. Tagirov
{"title":"Anomalous 141Pr nuclear magnetic relaxation in PrF3 Van Vleck paramagnet","authors":"A. S. Aleksandrov, A. Egorov, S. Korableva, M. Tagirov","doi":"10.26907/MRSEJ-19103","DOIUrl":"https://doi.org/10.26907/MRSEJ-19103","url":null,"abstract":"","PeriodicalId":18153,"journal":{"name":"Magnetic resonance in solids","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69161430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Shurtakova, B. Yavkin, M. Gafurov, G. Mamin, S. Orlinskii, L. Kuznetsova, S. A. Bakhteev, I. Ignatyev, I. Smirnov, A. Fedotov, V. Komlev
{"title":"Study of radiation-induced stable radicals in synthetic octacalcium phosphate by pulsed EPR","authors":"D. Shurtakova, B. Yavkin, M. Gafurov, G. Mamin, S. Orlinskii, L. Kuznetsova, S. A. Bakhteev, I. Ignatyev, I. Smirnov, A. Fedotov, V. Komlev","doi":"10.26907/MRSEJ-19105","DOIUrl":"https://doi.org/10.26907/MRSEJ-19105","url":null,"abstract":"","PeriodicalId":18153,"journal":{"name":"Magnetic resonance in solids","volume":"27 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69161647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The processes of aggregation and dissolution in model systems resin-asphaltene by NMR","authors":"D. S. Ivanov, E. Barskaya, V. Skirda","doi":"10.26907/mrsej-19202","DOIUrl":"https://doi.org/10.26907/mrsej-19202","url":null,"abstract":"","PeriodicalId":18153,"journal":{"name":"Magnetic resonance in solids","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69162013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Quantum magnetism of single molecules and diluted rare-earth alloys","authors":"B. Barbara","doi":"10.26907/mrsej-19404","DOIUrl":"https://doi.org/10.26907/mrsej-19404","url":null,"abstract":"","PeriodicalId":18153,"journal":{"name":"Magnetic resonance in solids","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69163394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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