title: Nuclear spin effect on recombination of H₃⁺ ions with electrons at 77 K.
abstract: Utilizing different ratios of para to ortho H₂ in normal and para enriched hydrogen, we varied the population of para-H₃⁺ in an H₃⁺ dominated plasma at 77 K. Absorption spectroscopy was used to measure the densities of the two lowest rotational states of H₃⁺. Monitoring plasma decays at different populations of para-H₃⁺ allowed us to determine the rate coefficients for binary recombination of para-H₃⁺ and ortho-H₃⁺ ions: (p)α(bin)(77 K) = (1.9 ± 0.4) × 10⁻⁷ cm³ s⁻¹ and (o)α(bin)(77 K) = (0.2 ± 0.2) × 10⁻⁷ cm³ s⁻¹.
authors.affiliation: Charles University, Faculty of Mathematics and Physics, Prague, Czech Republic.
authors.forename: J
authors.initials: J
authors.lastname: Varju
authors.forename: M
authors.initials: M
authors.lastname: Hejduk
authors.forename: P
authors.initials: P
authors.lastname: Dohnal
authors.forename: M
authors.initials: M
authors.lastname: Jílek
authors.forename: T
authors.initials: T
authors.lastname: Kotrík
authors.forename: R
authors.initials: R
authors.lastname: Plašil
authors.forename: D
authors.initials: D
authors.lastname: Gerlich
authors.forename: J
authors.initials: J
authors.lastname: Glosík