ppm in mass spectrometry

Can somebody explain simple definition from ppm in mass spectrometry

Regards
Esmaeil

Esmaeil Sadroddiny <[Only registered users see links. ]> wrote in
news:[Only registered users see links. ]. net:

p parts
p per
m million

Usually weight/weight, AFAIK
--
Best regards
Han
email address is invalid

Am 23.10.2008, 12:39 Uhr, schrieb Esmaeil Sadroddiny
<[Only registered users see links. ]>:


Are you sure you are talking about MS? ppm usually occurs in the context
of nuclear magnetic resonance (NMR) spectroscopy where it denotes the
chemical shift of a signal with respect to some reference compound. I.e.,
if the reference signal is at 400 MHz, a 1 ppm signal would be at 400.0004
MHz.

[iknew]

can sombody help with converting cubic centimeters to ppb or is that even possible?

[iknew]