Talk:Thomson
Note: The thomson is a non-standard unit in mass spectrometry that has never been widely accepted
The thomson is a unit, whereas m/z is a quantity. Therfore, the thomson would not replace m/z. Instead, the dimensionless m/z would be replaced with m/q which has the unit Th.
- m/q = n Th
where
- m/q is the symbol for a quantity of mass/charge
- n is the numerical value of the quantity m/q
- Th is the symbol for the unit thomson
Example:
- The base peak of H2O appears at 18 thomson.
Suggested Definition
New format - suggested definitions to appear in Discussion tab:
| Thomson |
|---|
| A new unit of the physical quantity mass/charge. The symbol m/q would then be used in place of the dimensionless m/z.
Cooks, R. G. and A. L. Rockwood (1991). "The 'Thomson'. A suggested unit for mass spectroscopists." Rapid Communications in Mass Spectrometry 5(2): 93. "The Thomson (Th), a unit for mass-to-charge ratio, was proposed to alleviate problems with imprecise terminol. generated by the advent of multiply charged ion mass spectroscopy. The definition proposed for the unit is: 1Th == 1 amu/atomic charge." "The Thomson (Th), a unit for mass-to-charge ratio, was proposed to alleviate problems with imprecise terminol. generated by the advent of multiply charged ion mass spectroscopy. The definition proposed for the unit is: 1Th == 1 u/atomic charge." |
| This is a Suggested Definition and should only appear under a discussion tab. Note that more than one suggested definition can appear in one discussion |
Moved from Front Page
See Mass Spec Desk Reference page 27 for an argument against the adoption of this term.
--K. Murray 21:42, 17 Jan 2005 (CST)
