several days ago I inquired about determining the absolute frequency at 0
ppm in DISNMR (the original message is below).
The frequency in question is the parameter SF, which by definition equals
SF0 + SR. (On *very* old AM's, this would be SF0 - 2*SY + SR for
X-nucleus)
The ratios of resonance frequencies of different nuclei determined to
8-9-10 sig. figs. can be found
in the recently published book "100 and More Basic NMR Experiments" (VCH).
Also the paper by Wishart et al., J.Biomol.NMR 6:135 (1995), can be
useful.
My thanks to everyone who replied !
--
Konstantin Momot
momot@iris100.chem.arizona.edu | Please note my new e-mail address http://www.u.arizona.edu/ | ~momot/research.html |
Original posting :
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We are running DISNMR on an AM500. I need to determine the *absolute* frequency corresponding to 0 ppm (i.e. 500.1378739478... MHz or whatever) after the spectrum has been referenced. Is it parameter SF or is it SF +/- O1 (or possibly something else) ?
Also, what is a good place to find the ratios of resonance frequencies of different nuclei (in particular, Carbon/Proton) to at least 9 or 10 significant figures ? I looked in the '81 edition of Brevard & Granger's Handbook, but they don't list carbon and everithing else they list to 5 or 6 sig. figs.
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