We can consider more situation: we can use frequency list in pulse
program, for observe channel, the last frequency used before acquisition
would set spectrum center since it is this frequency mixed with signal;
but for other channel, how they influence the spectrum center in
indirect dimensions ?
wujihui wrote:
>
> Dear BUMers,
>
> Since I posted the question about center of F1 dimension, I received
> many helpful advices, many thanks to those who help me. But I am still
> rather confused about that, for nuclus precession in t1, it changes
> phase as o2(if we use nuclus 2 in F1) when we see it in rotating frame,
> but how the amplitude of the detected signal changes with o2 since then
> the signal is in frequency of observe nuclus, and we use rotating frame
> in F2 just because the signal is mixed with RF of obserse nuclus. The
> question becomes more confusing if we consider 2Q spectrum or if we
> consider such experiment(though actually we don't do such): in HMQC
> experiment, if we omit 1H 180 pulse during t1, then the density operator
> would evolve under both X and 1H Larmor frequencies.
>
> Thanks,
> Wu Jihui
>
> --
> Wu Jihui, NMR lab.
> School of Life Science, University of Science and Technology of China
> Hefei, Anhui, 230026, P.R. of China
> Tel: 0086-551-3603745 Fax: 0086-551-3603754 email: wujihui@ustc.edu.cn
-- Wu Jihui, NMR lab. School of Life Science, University of Science and Technology of China Hefei, Anhui, 230026, P.R. of China Tel: 0086-551-3603745 Fax: 0086-551-3603754 email: wujihui@ustc.edu.cn
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