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Collision cross sections of myoglobin and cytochrome c ions with Ne, Ar, and Kr

TitleCollision cross sections of myoglobin and cytochrome c ions with Ne, Ar, and Kr
Publication TypeJournal Article
Year of Publication1997
AuthorsChen, YL, Collings, BA, Douglas, DJ
JournalJournal of the American Society for Mass Spectrometry
Date PublishedJul
Type of ArticleArticle
ISBN Number1044-0305

The energy losses of ions of myoglobin and cytochrome c in collisions with Ne, Ar, and Kr have been measured with a triple quadrupole mass spectrometer system. The results have been interpreted with drag coefficients, suitable for the case of an object moving through a low density gas, to give collision cross sections or, equivalently, projection areas. For a given charge state, these cross sections with Ne, Ar, and Kr are nearly identical. No evidence is found for substantial contributions to the cross section from ion-induced dipole forces. Comparisons of cross sections obtained with different gases and comparisons to literature cross sections measured by ion mobility suggest that a ’’diffuse’’ scattering model,suitable for collisions with a rough surface, gives the best description of collisions between protein ions and neutrals. (C) 1997 American Society for Mass Spectrometry.

URL<Go to ISI>://A1997XG35000001