Effective temperature (T eff) dependences of reduced mobilities and collision cross section of small carbon cluster cations, C n + (n = 625), were investigated by using a drift cell with temperatures of 170300K coupled with a reflectron time-of-flight mass spectrometer. We have measured ion mobility within E/N = 1628 Td, values of which are slightly higher than the general experimental value at low-field conditions. Thus, our conditions should correspond to medium field strength between low- and high-field conditions. Under the present conditions, collision cross section was found to be proportional to T eff-0.1 - T eff- 0.2. The power in the temperature dependence was slightly closer to zero than results obtained previously (A. A. Shvartsburg, G. C. Schatz, M. F. Jarrold, J. Chem. Phys., 1998, 108, 2416). This difference is probably due to E/N, resulting in the difference of relative kinetic energy between C n + and buffer gas atoms, in spite of the same T eff region. The result showed that the hard-sphere model is more applicable in the present conditions.
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