Center-of-mass energy distributions of the fragments from the collisional breakup reactionH3+→H

Abstract

We have measured the energy distributions of the H+ and the H ions resulting from the collisional dissociation H3+~2H++H in argon at a projectile energy of 2700 keV. The fragment ions were separated by an analyzing magnet and detected by silicon surface barrier detectors, with the H+ and the H ions being detected in coincidence. The energy distributions of the fragments in the projectile center-of-mass frame were extracted from their transverse spatial distributions observed at a position 150 cm downstream from the collision chamber. These distributions were used subsequently to determine the total kinetic energy of the fragments and the correlation angle 0» between the H+ momenta. A comparison is carried out with recently published data obtained in the low-velocity regime in helium.

Center-of-mass energy distributions of coincidentH−andH+Domínguez1, Martı́nez2, Cisneros3 et al. 1994Phys. Rev. A5000View full textAdd to dashboardCite

“…[6] 22+6 0.5 3 Ref. [8] 0.21 The present results are shown in Table I together with previously reported data. The comparison must be done by having in mind that the initial state of H3 is unknown, and that the results of Ref.…”

“…From these spectra, the most prob-able energy value of H+, 8 +, was found to lie between 0.75 and 4 eV, and the authors could register H+ counts with energies as high as 9 eV. The results at high energy [8] showed a difFerent behavior; W+ was found to be 0.89 eV, and the maximum energy of the protons, 8'+, ", was 4.1 eV. Moreover, these authors agreed with some of the results published in Refs.…”

“…Both cm distributions were normalized to encase the same area and are exhibited in In fact, that cm distributions represent the probability densities (p+ and p ) for finding a fragment with a given energy e; both distributions were used to perform the same analysis as in Ref. [8], and by following the same procedure. Thus, in the statistical analysis of these distributions each fragment was allowed any amount of cm energy, provided that the probability for a fragment to possess a certain amount of energy is given by the energy distribution, and that the total cm momentum of the three fragments is zero.…”

“…Recently [8], one experiment at 2700 keV was performed using Ar as a target, and again it was interpreted by assuming that at this energy the probability of charge transfer is also unlikely and that the main process is that of production of H and two protons. References [1,2] deal mainly with the total cross section for the negative-ion production.…”

“…References [1,2] deal mainly with the total cross section for the negative-ion production. References [5,7,8,9] deal with the study of the three body fragmentation. In…”