Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Heteronuclear cross-relaxation rates

Hartmann and Hahn [39] showed that CP can be achieved when two rf fields Bin and B c = 4Bih are simultaneously applied. Jn/jc = 4, so, when B c = 4Bm energy is transferred between them, or they are cross-polarized, because Tc ic = Th ih (which is called the Hartmann-Hahn match of heteronuclear rotating-frame frequencies). In the CP experiment C nuclei obtain their spin polarization from H nuclei, so, not only do the shorter proton spin-lattice relaxation times determine the repetition rate of... [Pg.375]

See other pages where Heteronuclear cross-relaxation rates is mentioned: [Pg.224]    [Pg.224]    [Pg.91]    [Pg.92]    [Pg.17]    [Pg.343]    [Pg.165]    [Pg.208]    [Pg.221]    [Pg.161]    [Pg.311]    [Pg.363]    [Pg.75]    [Pg.159]    [Pg.531]    [Pg.198]    [Pg.7]    [Pg.4]    [Pg.1512]    [Pg.247]    [Pg.58]    [Pg.347]    [Pg.260]    [Pg.241]    [Pg.1111]    [Pg.284]    [Pg.592]    [Pg.47]    [Pg.723]    [Pg.17]    [Pg.344]   
See also in sourсe #XX -- [ Pg.17 ]



SEARCH



Cross-relaxation

Cross-relaxation rates

Relaxation rates

© 2024 chempedia.info