Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 46, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/46/3/035201
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Funding
- Project UNAM-PAPIIT (Mexico) [IN111611]
- Project MICINN (Spain) [AYA2011-29936-C05-02]
- Junta de Andalucia, Proyecto de Excelencia (Spain) [FQM-5965]
- Conacyt
- PCF-UNAM
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The mobility of daughter negative ions of H2O in parent gas has been measured with a pulsed Townsend technique over the density-reduced field strength, E / N, range 9-100 Td and a pressure range 2-16 Torr. It has been found that the mobility of the anions is dependent on the gas pressure. Using a transport theory considering the influence of the permanent dipole field of H2O, we have found that the pressure-dependent mobilities can be associated with a series of cluster ions of the type OH- (H2O)(n) (n = 1-3), with the mass of the cluster species increasing with the total gas pressure. Also, the mobility of H- and OH- could be estimated. Using a Townsend avalanche simulator we have been able to explain the measured ionic currents in terms of an ion-molecule reaction scheme with a single set of swarm and reaction coefficients for each value of the density-reduced field strength, E / N, at several pressures. Regarding the positive ions, the only drifting ion is H3O+, the mobility of which could be estimated. The rate constants relative to the formation of the OH- (H2O)(n) (n = 1-3) species were also derived from this study.
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