Talk:M/q: Difference between revisions
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{{Sugdef|m/q| | {{Sugdef|m/q| | ||
m/ | m/Q is the symbol for a physical quantity [[Mass/charge Ratio|mass/charge]] which is measured by [[Mass Spectrometer|mass spectrometers]]. | ||
The former ''[[m/z]]'' is based on a [[Talk:Mass/Charge Ratio (Th, never use Da, no units?. An ion of m/z or an ion at m/z?)|missconception]] and should no longer be used. | The former ''[[m/z]]'' is based on a [[Talk:Mass/Charge Ratio (Th, never use Da, no units?. An ion of m/z or an ion at m/z?)|missconception]] and should no longer be used. | ||
The SI unit of the physical quantity ''m/ | The SI unit of the physical quantity ''m/Q'' is kilogram/coulomb ('''kg/C'''). | ||
In [[Mass Spectrometry | mass spectrometry]] it is more common to use the [[Atomic Mass Unit]] '''u''' and the [http://www.iupac.org/goldbook/A00504.pdf atomic unit] for charge '''e''' which is equal to the [http://www.iupac.org/goldbook/E02032.pdf elementary charge]. | In [[Mass Spectrometry | mass spectrometry]] it is more common to use the [[Atomic Mass Unit]] '''u''' and the [http://www.iupac.org/goldbook/A00504.pdf atomic unit] for charge '''e''' which is equal to the [http://www.iupac.org/goldbook/E02032.pdf elementary charge]. | ||
This means the unit for mass/charge is: | This means the unit for mass/charge is: | ||
: [''m/ | : [''m/Q''] = '''u'''/'''e''' | ||
For simplicity, '''u''' is better called [[Dalton]] ('''Da''') and '''e''' is called [[Millikan]] ('''Mi'''). | For simplicity, '''u''' is better called [[Dalton]] ('''Da''') and '''e''' is called [[Millikan]] ('''Mi'''). | ||
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Therefore | Therefore | ||
: [''m/ | : [''m/Q''] = '''u'''/'''e''' = '''Da'''/'''Mi''' = '''Th''' | ||
Hence, a [[Mass Spectrum | mass spectrum]] x-axis should be labeled as either of the below: | Hence, a [[Mass Spectrum | mass spectrum]] x-axis should be labeled as either of the below: | ||
* ''m/ | * ''m/Q'' ('''u'''/'''e''') | ||
* ''m/ | * ''m/Q'' ('''Da'''/'''Mi''') | ||
* ''m/ | * ''m/Q'' ('''Th''') | ||
Revision as of 11:23, 29 July 2006
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