From Mass Spectrometry Terms
|Wikipedia link, see: Thomson (unit)|
|SPARKMAN INCORRECT TERM|
|This term has been flagged as incorrect in Mass Spec Desk Reference|
|ASMS TERMS AND DEFINITIONS POSTER ENTRY|
Note from a reader: on Thomson - the fluid dynamics people have already used that one; it is listed in the CRC Handbook and IUPAC documents. ASMS should be doing things in addition to or clarifying points mentioned (or not) in IUPAC. However, we should be cautious about doing anything that actually opposes or conflicts with IUPAC documents.
|ASMS Terms and Definitions Poster|
|The term Thomson (unit) is listed as a problem term due to obsolescence, misuse, conflict with another term, trademark, commercial use, or other reason.|
- "This [mass-to-charge] unit would be defined as the quotient of mass in units of u and the number of charges, z. The number of charges could be positive or netagive, depending on the sign of the charge âˆšÃ‰Â¬Â¢âˆšÂ¢â€šÃ„Ã¶Â¬Â¨âˆšÃ‡Â¬Â¶ Using the standard rules for abbreviation, we have 1 Th = 1 u/atomic charge. For example, the peptide [sic] myoglobin myoglobin (isotope average molecular weight 16,950 u) can be deduced from the measurement of a peak at 998.0 Th provided it is known that the ion bears 17 charges."