Collision cross sections (in Å2) of individual protein charge states.a

a Proteins are listed from left to right in order of molecular weight. Unless otherwise denoted, cross sections are provided for protonated ions. Multiple values corresponding to a single protein charge state indicate the observation of multiple resolvable peak maxima. Protein sources are as follows: ubiquitin (bovine); cytochrome c (horse), lysozyme (turkey egg white), and apomyoglobin (sperm whale).
b Ion charge state (absolute value).
c Valentine, S.J.; Counterman, A.E.; Clemmer, D.E. J. Am. Soc. Mass Spectrom. 1997, 8, 954.
d Shelimov, K. B.; Clemmer, D. E.; Hudgins, R. R.; Jarrold, M. F. J. Am. Chem. Soc. 1997, 119, 2240.
e Valentine, S.J.; Anderson, S.J.; Ellington, A.E; Clemmer, D.E. J. Phys. Chem. B 1997, 101, 3891.
f Liu, Y.; Valentine, S. J.; Clemmer, D. E. (unpublished results).