Improvement of the merged-beam method and its application to the study of the reaction:

Abstract

It is shown that two parallel ion beams react at a rate that is independent of their density profiles when made to oscillate against each other in a two-dimensional scanning motion. An experimental set-up that makes use of this principle is described. Absolute cross sections obtained in this way are in good agreement with those obtained with the beams merging in the usual (static) mode. Cross sections for single-charge transfer between and in the energy range 5 - 4000 eV are presented and compared to other existing data.

$ M$-strongly convex subsets and their generating sets

“…The nucleus motion is described classically and Coulomb attraction trajectories are used for this motion. A satisfactory agreement with the experimental cross section [15] is obtained.…”

“…In figure 8 the total cross section of the one-electron charge exchange (A) is shown for comparison with Ermolaev's theoretical results [12] and with the results of experimental measurements [2,13,15,16]. The first main difference between that of Ermolaev and our calculation is that the first one treats the H − + He + system as a one-electron system while ours considers it as a three-electron system with allowance for the formation of He in triplet and singlet states.…”

“…Total cross section for one-electron exchange at small collision velocities. Curve 3 is the experimental cross section [15] and curves 1, 2, 4 and 5 are calculated ones. Curve 1 is the cross section with Q 3 = 0 and the correct values of the He * 3 3,1 S, 3 3 P energies.…”

“…In this paper we investigate the cross section of the reaction H − + He + (1s) = H(1s) + He * (1s, nlm) (A) which was previously measured in [2,13,[15][16][17] and calculated in [12,17]. In the present work, the system H − + He + is treated as a three-electron system and the matrix elements for the population of the He * (1s, nlm) singlet and triplet states are derived.…”

Rate Coefficient Determination in Charge Transfer Reactions

“…The development of modern facilities such as crossed-or merged-beam techniques [7,8], and more recently ion-trap experiments [9] lead to possible experimental investigations in the very low collision energy range. Experiments using laser-induced-plasma ion sources and ion storage [9] provide for the first time a direct determination of rate coefficients at low temperatures, of the order of 10 3 to 10 4 K.…”