Rate coefficients of collisional H – H^*(n) ionization and H – H⁺– e and H₂⁺– e recombination

Abstract

On the basis of a semi-classical theory, the rate coefficients of collisional H -H*(n) ionization and recombination during electron scattering on H -H + complexes and H : ions were determined in this paper. The calculations were carried out in the case of non-equilibrium hydrogen plasma with atomic temperature Ts and electronic temperature Te, in the domains 2000 K Q Q 10 000 K and 2000 K 6 To Q 30 000 K, with the principal quantum number 4 C n Q 10. In the paper we have also determined the conditions under which these processes are important for the kinetics of weakly ionized hydrogen plasma.Table I . Calculated values of coefficients KPb) as functions of n, T, and T,, for n = 4-10.T,/[Kl (n = 4) T,

The influence of -mixing processes in collisions on atoms’ populations in weakly ionized helium plasmas

“…On the other hand, the resonant mechanism generates transitions between Rydberg's states of outer electron that are allowed by selective rules. This was used to apply a semiclassical theory for the chemi-ionization processes in the cases of hydrogen [28,29] and helium [30,33].…”

“…The efficiency of the resonant mechanism for chemi-ionization/recombination processes in weakly ionized hydrogen and helium plasmas [29,30] suggested that one should expect similar situation in the case of (n − n ′ )-mixing processes. The semi-classical method based on this mechanism, developed in [10], was used in this paper and applied for the rate coefficients' calculations of excitation processes…”

“…In the case of hydrogen and helium atoms, the resonant mechanism was used to analyze the chemi-ionization and their inverse chemi-recombination processes [27][28][29][30][31][32][33]. It was shown that in weakly ionized hydrogen and helium plasmas the chemiionization/recombination processes caused by the resonant mechanism can be dominant in populating the Rydberg's states.…”

Influence of chemi-ionization and chemi-recombination processes on the population of hydrogen Rydberg states in atmospheres of late type dwarfs

“…One can notice that within the frame of this approach, the processes (2a) and (2b) may be described practically in the same way. Expressions for the rate coefficients in the processes (1a,b) and (2a,b) which are used here as well as the method of determination of the rate coefficients are described in details in Mihajlov et al (1996b).…”

Commission 14: Atomic and Molecular Data: (Donnees Atomiques et Moleculaires)

“…Notable examples of results for excitation include proton impact excitation for Be-like (Ryan et al 1998), B-like (Foster et al 1997), C-like (Ryan et al 1999), and Be-like to Cl-like ions . Regarding ionization, the following works are of particular interest: He* + H (Mihajlov et al 1996), H + H (Krstic et al 1996), H+ + 0 (Thompson et al 1997), H+, He 2 +, Li 3 + + H (Toshima 1997), and H+ + H (Shah et al 1998).…”