title: Binary and ternary recombination of D3+ ions at 80-130 K: application of laser absorption spectroscopy.
abstract: Recombination of D(3)(+) ions with electrons at low temperatures (80-130 K) was studied using spectroscopic determination of D(3)(+) ions density in afterglow plasmas. The use of cavity ring-down absorption spectroscopy enabled an in situ determination of the abundances of the ions in plasma and the translational and the rotational temperatures of the recombining ions. Two near infrared transitions at (5792.70 ± 0.01) cm(-1) and at (5793.90 ± 0.01) cm(-1) were used to probe the number densities of the lowest ortho state and of one higher lying rotational state of the vibrational ground state of D(3)(+) ion. The results show that D(3)(+) recombination with electrons consists of the binary and the third-body (helium) assisted process. The obtained binary recombination rate coefficients are in agreement with a recent theoretical prediction for electron-ion plasma in thermodynamic equilibrium with α(bin)(80 K) = (9.2 ± 2.0) × 10(-8) cm(3) s(-1). The measured helium assisted ternary rate coefficients K(He) are in agreement with our previously measured flowing afterglow data giving a value of K(He)(80 K) = (1.2 ± 0.3) × 10(-25) cm(6) s(-1).
authors.affiliation: Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic.
authors.forename: Petr
authors.initials: P
authors.lastname: Dohnal
authors.forename: Michal
authors.initials: M
authors.lastname: Hejduk
authors.forename: Peter
authors.initials: P
authors.lastname: Rubovič
authors.forename: Jozef
authors.initials: J
authors.lastname: Varju
authors.forename: Štěpán
authors.initials: Š
authors.lastname: Roučka
authors.forename: Radek
authors.initials: R
authors.lastname: Plašil
authors.forename: Juraj
authors.initials: J
authors.lastname: Glosík