Zobrazeno 1 - 10
of 19
pro vyhledávání: '"R. L. Vold"'
Publikováno v:
Solid state nuclear magnetic resonance. 13(1-2)
The technique of 2H MAS NMR spectroscopy is presented for the investigation of multiaxial molecular dynamics. To evaluate the effects of discrete random reorientation a Lie algebraic formalism based on the stochastic Liouville-von Neumann equation is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::9789afb3b525c872e9b78d39cda866e4
https://pubmed.ncbi.nlm.nih.gov/9875600
https://pubmed.ncbi.nlm.nih.gov/9875600
Autor:
R. L. Vold, R. R. Vold
Publikováno v:
The Journal of Chemical Physics. 61:2525-2529
The response of a scalar coupled spin system to a train of closely spaced 180° pulses is analyzed by means of an effective Liouville operator from which terms involving chemical shifts are omitted. It is shown that the resulting equations of motion
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f94d9847eef68c7d4a6d8f65eb3e94b
https://doi.org/10.1063/1.1682373
https://doi.org/10.1063/1.1682373
Publikováno v:
The Journal of Chemical Physics. 66:1202-1216
In this paper we describe the use of nuclear magnetic relaxation in strongly coupled spin systems for determining all three rotational diffusion constants of rigid, planar molecules with C2v symmetry. The complete evaluation of the motional parameter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::21d71625af4eef809517f0254a635276
https://doi.org/10.1063/1.434067
https://doi.org/10.1063/1.434067
Autor:
R. L. Vold, H. S. Gutowsky
Publikováno v:
The Journal of Chemical Physics. 47:2495-2503
A spin‐echo study of internal rotation in liquid 1,1‐difluoro‐1,2‐dibromodichloroethane is reported. Carr‐Pucrell spin‐echo (CPSE) trains were observed from −115° to +100°C with rf pulse spacings of 0.4 to 32 msec. Modulation of the e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::845f2db99423b649deceee1dfe97b29f
https://doi.org/10.1063/1.1703335
https://doi.org/10.1063/1.1703335
Publikováno v:
The Journal of Chemical Physics. 43:4107-4125
The Anderson—Weiss formalism is used to develop a general theory for calculating the effects of chemical exchange and spin coupling on echo amplitudes in Carr—Purcell pulse sequences on spin systems in the liquid phase. The theory is shown to inv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6cf342c879014cd0e4dcc99c45d52c11
https://doi.org/10.1063/1.1696648
https://doi.org/10.1063/1.1696648
Publikováno v:
The Journal of Chemical Physics. 47:3130-3138
Fluorine and proton high‐resolution NMR lineshapes have been observed at 56.4 and 60 MHz, respectively, for a 50 mole % solution of 1‐fluoro‐1,1,2,2‐tetrachloroethane in carbon disulfide, between −120° and −14°C. Fluorine spin echoes we
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::92f4a8982a2a249fb898d58b2fa1835c
https://doi.org/10.1063/1.1712364
https://doi.org/10.1063/1.1712364
Autor:
R. L. Vold, R. D. Orwoll
Publikováno v:
Journal of the American Chemical Society. 93:5335-5338
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2659186c87d382214f0c39de58e34d94
https://doi.org/10.1021/ja00750a004
https://doi.org/10.1021/ja00750a004
Autor:
H. S. Gutowsky, R. L. Vold
Publikováno v:
The Journal of Chemical Physics. 47:4782-4788
Spin—lattice relaxation behavior is calculated for the six lines of the high‐resolution NMR spectrum of an AX spin system in which the A spin has I = ½ and the X, 32. Intramolecular dipole—dipole interactions, quadrupole relaxation of the spin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::574b6149887dc42a7f70417e1b7d2be1
https://doi.org/10.1063/1.1701698
https://doi.org/10.1063/1.1701698
Publikováno v:
The Journal of Chemical Physics. 48:662-670
The behavior of a spin system disturbed by a train of closely spaced pulses can, under the proper limiting circumstances, be described in terms of a time‐independent effective Hamiltonian. The necessary conditions on pulse spacing are discussed and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f5d97a833de04fb42971fa4d8b15263b
https://doi.org/10.1063/1.1668698
https://doi.org/10.1063/1.1668698
Autor:
R. L. Vold, S. O. Chan
Publikováno v:
The Journal of Chemical Physics. 56:28-31
Transverse nuclear magnetizations of chemically shifted nuclei are shown to be coupled by real damping factors or cross relaxation terms. It is shown theoretically and experimentally that this coupling leads to cases for which T2 is longer than T1. C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ba0f73ed597f3103a7901bfbd4cb8a03
https://doi.org/10.1063/1.1676859
https://doi.org/10.1063/1.1676859