The frequency difference should not depend on the sign of gamma.
(Please correct me, if I'm wrong.)
The sign only matters, if you generate NOEs, i.e. during broadband
decoupling. Then the signals _may_ have opposite signs.
The best example for the two different isotopes in the same spectral range
is Ti-47 and Ti-49. The difference between their resonance frequencies is so
small (3500 Hz at 7 Tesla) that you will always see signals of both isotopes.
Juergen.
----------------------------------------------------------------------
Juergen Schulte ! !
NMR Specialist U
SUNY Binghamton ~
Department of Chemistry Phone: (607) 777-4405
Binghamton, NY 13902-6016 Fax: (607) 777-4478
----------------------------------------------------------------------
schulte@bingsuns.cc.binghamton.edu, schulte@binghamton.edu
----------------------------------------------------------------------
On Tue, 5 Mar 1996, Peter Lundberg wrote:
> Dear spectroscopists,
>
> Here is a trick question (at least to my ignorant mind).
>
> If one observes (or would like to observe) two different isotopes in the same
> spectral window (using quadrature detection), what is the frequency difference
> (spectral width) if gyromagnetic ratios have the SAME sign, or OPPOSITE sign?
> What is the relative phase of the two peaks (say Ag109 and K39)?
>
> Are there any examples of the observation of two isotopes in the same spectral
> window using ordinary spectrometers?
>
> 73, Peter
>
> @ @
> ..
> ==================================================ooOO==========OOoo======
> | Peter Lundberg Ph: (+46 90) 16 59 73 |
> | Physical Chemistry Fax: (+46 90) 16 77 79 |
> | U of Umea Email: PeterL@umdix.umdc.umu.se |
> | S-901 87 Umea Efax: PeterLundberg@f090167779.fax.sunet.se |
> | Sweden www: http://www.chem.umu.se/divisions/fk |
> ==========================================================================
> () "To a poet nothing is useless." (SJ) ooOO OOoo
>
> C:\ONGRTLNS.W95 Abort,retry,ignore?
>
>