Zobrazeno 1 - 10
of 95
pro vyhledávání: '"S. Emid"'
Autor:
S. Emid
Publikováno v:
Physica B: Condensed Matter. 398:38-39
Multiphase sensitive detection at constant time on the free induction decay of the magnetization after an RF-pulse and phase encoding the signals in relation to the detectors result in high-resolution magnetic resonance instant imaging. The field gra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2071b99e78af202392682de27631d2b9
https://doi.org/10.1016/j.physb.2007.02.099
https://doi.org/10.1016/j.physb.2007.02.099
Publikováno v:
Physica B+C. 100:215-218
Methods have been developed for a direct observation of the dipolar relaxation during the short free induction decay times in solids. Experimental evidence is given that the dipolar energy is a constant of the motion, even during establishment of int
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2fc37985f9459591c1ec7c3591adfeb7
https://doi.org/10.1016/0378-4363(80)90008-x
https://doi.org/10.1016/0378-4363(80)90008-x
Publikováno v:
Chemical Physics Letters. 33:269-274
Spin—lattice relaxation of non-interacting tunnelling methyl groups is determined by seven coupled parameters. For interacting methyl groups in a solid the number of parameters is reduced, by symmetry-restricted spin diffusion, to four, describing
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::91486f957aac7d137d4433464e18fca7
https://doi.org/10.1016/0009-2614(75)80153-9
https://doi.org/10.1016/0009-2614(75)80153-9
Autor:
S. Emid
Publikováno v:
Chemical Physics Letters. 80:393-397
Reonentations of methyl groups in solids are symmetry restricted. Consequently long-lived spin symmetry species and reorientations coexist even at high temperatures. This is a refinement of the usual reorientation model. The possibility of creating a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b3605b4db6fb81a3865eba0358259564
https://doi.org/10.1016/0009-2614(81)80135-2
https://doi.org/10.1016/0009-2614(81)80135-2
Publikováno v:
Physica B+C. 121:47-52
For three-spin 12 systems like CF3 groups reorienting about their C3-axes which make an angle β with the magnetic field, theory predicts that under extreme narrowing condition the ratio of the intramolecular dipolar and Zeeman relaxation times (TID/
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2397c1a423dd15f0c15f94c6f70c272b
https://doi.org/10.1016/0378-4363(83)90125-0
https://doi.org/10.1016/0378-4363(83)90125-0
Autor:
S. Emid, D. Lankhorst
Publikováno v:
Physica B+C. 113:57-68
The proton spin-lattice relaxation of rapidly reorienting benzene molecules in the solid phase is calculated using the symmetry restricted spin diffusion model. The Zeeman and dipolar relaxations are coupled to population differences of the symmetry
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f18e443cb3b36b6c7e712bb9be4f880e
https://doi.org/10.1016/0378-4363(82)90110-3
https://doi.org/10.1016/0378-4363(82)90110-3
Publikováno v:
Physica B+C. 93:344-348
The lock-in detected proton NMR-signals of methyl groups in solids is considered at arbitrary temperatures of the spin system. In the high temperature approximation the results reduce to those of Goldman and others, extended with coupled spin-lattice
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9c759919507ba8c44810f5a489cb8dfa
https://doi.org/10.1016/0378-4363(78)90023-2
https://doi.org/10.1016/0378-4363(78)90023-2
Publikováno v:
The Journal of Chemical Physics. 73:172-175
The spin–lattice relaxation of deuterated methyl groups, which is exponential at high temperatures, becomes nonexponential at low temperatures as evidence of the coupling between the Zeeman and tunneling systems. The dominant relaxation is consider
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9be98572bd02c8d34890fe93e737eeaa
https://doi.org/10.1063/1.439903
https://doi.org/10.1063/1.439903
Publikováno v:
Physica B: Condensed Matter. 154:97-104
The Zeeman spin-lattice relaxation is measured in a single crystal and in powdered samples of lithium acetate (CH 3 COOLi·2D 2 O). Measurements have also been performed in powdered samples of lithium acetate which contain 50% and 95% of CD 3 -groups
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1d879cb93da457957ec79e382a8cbd4a
https://doi.org/10.1016/0921-4526(88)90023-3
https://doi.org/10.1016/0921-4526(88)90023-3
Publikováno v:
Physica B+C. 93:327-343
The influence of symmetry-restricted spin diffusion on the spin-lattice relaxation of rapidly reorienting molecular groups in solids is considered. Each group consists of three identical spin-12 nuclei at the corners of an equilateral triangle. First
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2441f413661de4e8d652694464d4b523
https://doi.org/10.1016/0378-4363(78)90022-0
https://doi.org/10.1016/0378-4363(78)90022-0