==Chemical shift referencing== Since the numerator is usually in hertz, and the denominator in megahertz, delta is expressed in ppm. The detected frequencies (in Hz) for 1H, 13C, and 29Si nuclei are usually referenced against TMS (tetramethylsilane) or DSS, which is assigned the chemical shift of zero. Other standard materials are used for setting...
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http://en.wikipedia.org/wiki/Chemical_shift
(from the article `chemical compound`) ...reference peak because they absorb radiation of higher energy than the hydrogens of tetramethylsilane. The distance of the proton absorptions from ...
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http://www.britannica.com/eb/a-z/c/63
the difference in the absorption spectrum of a particular proton from the absorption position of a reference proton.
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http://www.chemistry-dictionary.com/definition/chemical+shift.php
Dependence of the resonance frequency of a nucleus on the chemical binding of the atom or molecule in which it is contained. ... See: chemical shift artifact. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
Type: Term Definitions: 1. dependence of the resonance frequency of a nucleus on the chemical binding of the atom or molecule in which it is contained. See: chemical shift artifact
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