@article {3932, title = {Collision cross sections of myoglobin and cytochrome c ions with Ne, Ar, and Kr}, journal = {Journal of the American Society for Mass Spectrometry}, volume = {8}, number = {7}, year = {1997}, note = {ISI Document Delivery No.: XG350Times Cited: 78Cited Reference Count: 27}, month = {Jul}, pages = {681-687}, type = {Article}, abstract = {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 {\textquoteright}{\textquoteright}diffuse{\textquoteright}{\textquoteright} 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.}, keywords = {GAS-PHASE, PROTEIN IONS}, isbn = {1044-0305}, url = {://A1997XG35000001}, author = {Chen, Y. L. and Collings, B. A. and Douglas, D. J.} }