Binary and ternary recombination of para-H3(+) and ortho-H3(+) with electrons: state selective study at 77-200 K |
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Authors: | Dohnal Petr Hejduk Michal Varju Jozef Rubovič Peter Roučka Štěpán Kotrík Tomáš Plašil Radek Glosík Juraj Johnsen Rainer |
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Affiliation: | Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, Prague 18000, Czech Republic. |
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Abstract: | Measurements in H(3)(+) afterglow plasmas with spectroscopically determined relative abundances of H(3)(+) ions in the para-nuclear and ortho-nuclear spin states provide clear evidence that at low temperatures (77-200 K) para-H(3)(+) ions recombine significantly faster with electrons than ions in the ortho state, in agreement with a recent theoretical prediction. The cavity ring-down absorption spectroscopy used here provides an in situ determination of the para/ortho abundance ratio and yields additional information on the translational and rotational temperatures of the recombining ions. The results show that H(3)(+) recombination with electrons occurs by both binary recombination and third-body (helium) assisted recombination, and that both the two-body and three-body rate coefficients depend on the nuclear spin states. Electron-stabilized (collisional-radiative) recombination appears to make only a small contribution. |
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