Ion-Ion Recombination in Iodine Afterglows†
- 1 August 1964
- journal article
- electronics section
- Published by Taylor & Francis in Journal of Electronics and Control
- Vol. 17 (2) , 171-180
- https://doi.org/10.1080/00207216408937696
Abstract
Recombination coefficients, in afterglows following pulsed radio-frequency discharges in iodine vapour, are determined by a radio-frequency probing method, which uses the variation of the dielectric constant to measure the ion concentration. A small linear radio-frequency mass spectrometer is used to identify the ions present. The results show that the recombination coefficient, α, for the mutual neutralization process I2 ++I−→I2'+I'' is independent of pressure between 0.23 and 1.0 torr, and is dependent on ion temperature. At ion temperatures of 296±3, 328±5 and 338±5°k, the mean values of α are l.22( ± 0.03) × 10−7, l.04( ± 0.05) × 10−7, and 1.01 (±0.08) × 10−7 cm3sec−2, respectively. Diffusion becomes noticeable at pressures lower than 0.23 torr. From the limited information available the product of diffusion coefficient and pressure, Dap, is estimated to be 10± 3 cm2 sec−1 torr.Keywords
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