The influence of ion/molecule reactions on the evaluation of ion mobility and diffusion coefficients

Urquijo, J. de; Álvarez, I.; Cisneros, C.; Martı́nez, H.

doi:10.1016/0168-1176(96)04364-9

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Cited by 8 publications

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“…For the particular geometry of our drift tube, it has been shown that when drift distances are long (>5 cm) and the gas pressure is relatively low (<50 Pa), then the calculated mean, t , of the ATS can be expressed to a good approximation as [7]…”

Section: Methodsmentioning

confidence: 99%

Drift and proton transfer reactions of positive ions in methane parent gas

Urquijo¹,

Domínguez²,

Álvarez³

et al. 1997

J. Phys. B: At. Mol. Opt. Phys.

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We have measured the mobility of , , and in methane over a wide range of the reduced field strength, E/N, from 15 to 520 Td with a drift-tube mass spectrometer. The mobility of the latter ion could be measured because of the presence of 200 ppm of water vapour in the gas, thus leading to the formation of by proton-transfer reactions between and with . A thorough measurement of the variation of the relative ionic fluxes of and with gas density, drift distance and E/N, allowed us to derive proton-transfer cross sections and rates for the above reactions, up to . The cross sections were found to decrease steadily with the mean energy of the ions, suggesting that a fraction of the field-induced energy could possibly be transferred collisionally into internal ionic energy.

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Section: Methodsmentioning

confidence: 99%