Statistical dynamics of direct three-body recombination of heavy ions in the presence of argon and xenon atoms

Dynamics of third order direct three-body recombination of heavy ions

“…Table 2 implies that for both the pairs Cs + + F À and Cs + + I À of the recombining ions, in the energy ranges sampled, the Xe atom is noticeably more effective as an acceptor of excess kinetic energy of the ion pair than the Ar atom. The same observation holds for recombination Cs + + Br À + R. 11 Most probably, the higher effectiveness of xenon with respect to argon is due to a larger mass of Xe as well as to larger bond energies in the systems Cs + -Xe and X À -Xe compared with the respective systems Cs + -Ar and X À -Ar where X À = F À , Br À , I À , see the works quoted in Table 1. Because of these factors, the Xe atom has a stronger effect on the motion of the recombining ions than the Ar atom.…”

“…The choice of initial conditions for classical trajectories in our calculations was organized essentially the same way as in the previous papers of our group devoted to three-body recombination Cs + + Br À + R -CsBr + R (R = Ar, Xe) with non-central encounters of the recombining ions. 5,9,11 The four most important kinematic parameters of direct three-body recombination (1) (where R is a neutral atom) are the energy E i of approach of the ions (the ion encounter energy, i.e. the initial kinetic energy of the relative motion of the ions), the third body energy E R (the initial kinetic energy of the relative motion of the R atom and the ion pair), the impact parameter b i of the ion encounter, and the impact parameter b R of the third body R with respect to the center of mass of the ion pair.…”

“…This distance is ''controlled'' by one more kinematic parameter, namely, the so-called delay parameter T del . 9,11 This parameter is a dimensionless quantity defined as follows. Suppose that the ions M + and X À move along a straight line towards each other under pure Coulomb attraction with the initial relative kinetic energy E i and with the initial distance d i .…”

“…However, the calculations show that the cross term has almost no effect on the CID dynamics. In all the papers of our group [4][5][6][7][8][9][10][11]13 devoted to recombination reactions Cs + + Br À + R and RCs + + Br À (R = Ar, Kr, Xe) and in some papers (see e.g. ref.…”

“…By now, as far as the authors know, the dynamics of three-body recombination of ions has been explored this way only for recombination of the ions Cs + and Br À in the presence of rare gas and mercury atoms. [3][4][5][6][7][8][9][10][11][12][13] In this paper, we consider direct three-body recombination of the ions Cs + + F À and Cs + + I À according to the general scheme (1) in the collision energy range 1-10 eV typical for low temperature plasma:…”