Mass (mass spectrometry)
（重定向自Exact mass）
![J. J. Thomson discovered the isotopes of neon using mass spectrometry.](/Images/godic/202501/12/Discovery_of_neon_isotopes4129.JPG")
![Theoretical isotope distribution for the molecular ion of caffeine](/Images/godic/202501/12/Caffeine_mass4129.gif")
![Theoretical isotope distribution for the molecular ion of glucagon (C153H224N42O50S)](/Images/godic/202501/12/Glucagon_mass4129.gif")
![Francis William Aston won the 1922 Nobel Prize in Chemistry for his discovery, by means of his mass spectrograph, of isotopes, in a large number of non-radioactive elements, and for his enunciation of the whole number rule.[17][18]](/Images/godic/202501/12/Francis_William_Aston4129.jpg")
The mass recorded by a mass spectrometer can refer to different physical quantities depending on the characteristics of the instrument and the manner in which the mass spectrum is displayed.
Exact mass
英语百科
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