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. Author manuscript; available in PMC: 2014 May 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2013 Mar 22;24(5):657–674. doi: 10.1007/s13361-012-0518-4

Table 1.

Relative collision energies (Erel) in the center-of-mass frame at different laboratory energies (Elab) for the collision of protein molecular ions with helium gas.

Protein MW Laboratory collision energies
1 keV 8 keV 20 keV
Substance P 1,348 2.97 ev 23.7 ev 59.4 ev
Ubiquitin 8,566 0.47 ev 3.7 ev 9.3 ev
Cytochrome C 12,328 0.32 ev 2.6 ev 2.5 ev
C fragment of tetanus toxin 51,819 0.08 ev 0.6 ev 1.5 ev
Bovine serum albumin 66,430 0.06 ev 0.5 ev 1.2 ev