Talk:Mass/charge Ratio: Difference between revisions

From MS Terms
No edit summary
No edit summary
Line 17: Line 17:
I moved the [[Suggested Definition]] from the front page and used the new template:
I moved the [[Suggested Definition]] from the front page and used the new template:


{{Sugdef|m/z|The mass/charge ratio is a physical property that is measured by [[Mass Spectrometer | mass spectrometers]].
{{Sugdef|m/q|The mass/charge ratio is a physical property that is measured by [[Mass Spectrometer | mass spectrometers]].


The symbol for the physical quantity mass/charge is ''m/q''. The former ''[[m/z]]'' is based on a missconception and should no longer be used.  
The symbol for the physical quantity mass/charge is ''[[Talk:M/q|m/q]]''. The former ''[[m/z]]'' is based on a missconception and should no longer be used.  


The SI unit of the physical quantity ''m/q'' is kilogram/coulomb ('''kg/C''').
The SI unit of the physical quantity ''m/q'' is kilogram/coulomb ('''kg/C''').
Line 27: Line 27:
: [''m/q''] = '''u'''/'''e'''  
: [''m/q''] = '''u'''/'''e'''  


'''u''' is sometimes called [[Dalton]] ('''Da'''). '''u'''/'''e''' is sometimes called [[Thomson]] ('''Th'''). Hence, a [[Mass Spectrum | mass spectrum]] x-axis should be labeled as either of the below:
For simplicity, '''u''' is better called [[Dalton]] ('''Da''') and '''e''' is called [[Millikan]] ('''Mi''').
 
'''u'''/'''e''' is sometimes called [[Thomson]] ('''Th''').  
 
Therefore
: [''m/q''] = '''u'''/'''e''' = '''Da'''/'''Mi''' = '''Th''' 
 
Hence, a [[Mass Spectrum | mass spectrum]] x-axis should be labeled as either of the below:
* ''m/q''  ('''u'''/'''e''')
* ''m/q''  ('''u'''/'''e''')
* ''m/q''  ('''Da'''/'''e''')
* ''m/q''  ('''Da'''/'''Mi''')
* ''m/q''  ('''Th''')}}
* ''m/q''  ('''Th''')
 
 
'''References'''
:[http://www.iupac.org/goldbook/Q04982.pdf gold book: quantity]
:[http://www.iupac.org/goldbook/P04666.pdf gold book: physical quantity]
:[http://www.iupac.org/goldbook/V06593.pdf gold book: value of a quantity]
}}
 


(Note that this isn't my def, just my edit to put it on the Discussion page - KKM)
(Note that this isn't my def, just my edit to put it on the Discussion page - KKM)
: -- [[User:Kkmurray|K. Murray]] 15:03, 13 Jan 2005 (CST)
: -- [[User:Kkmurray|K. Murray]] 15:03, 13 Jan 2005 (CST)

Revision as of 07:33, 15 January 2005