Two- and Three-Body Kinematical Correlation in the Dissociative Recombination ofH3+

Abstract

Fragmentation patterns for dissociative recombination of the triatomic hydrogen molecular ion H(3)(+) in the vibrational ground state have been measured using the storage ring technique and molecular fragment imaging. A broad distribution of vibrational states in the H(2) fragment after two-body dissociation and a large predominance of nearly linear momentum geometries after three-body dissociation are found. The fragmentation results are directly contrasted with Coulomb explosion imaging data on the initial H(3)(+) geometry, compared to existing wave-packet calculations, and considered in the light of a simple physical picture.

Two- and three-body photodissociation of gas phase I3−

“…42,46,48 Each point within the inscribed circle represents a mapping of the center-of-mass momentum vectors for the three photofragments, subject to the constraint that the sum of the vectors is zero. As mentioned in Sec.…”

Storage Ring Experiments with Cold Molecular Ions: the H3+ Puzzle

“…Recent calculations [9] assume that the collision system starting as H The two-body fragment imaging data of H 3 + and D 3 + were used to extract the vibrational populations for the H 2 and D 2 molecular products [21,22]. These distributions are broad and peak at v ∼ 5 and v ∼ 10 for H 2 (v) and D 2 (v), respectively; the initial as well as the final rotational energy, which cannot be specified experimentally, leave an uncertainty of ±1 in correlating the measured energy release to the v quantum number.…”

“…Three-body events for the DR of H 3 + and D 3 + measured with velocity-matched electron and ion beams at the TSR (collision energies near kT e ∼ 12 meV) were analyzed with respect to the geometry of the fragmentation patterns [21,22]. From the two-dimensional imaging data representing projected geometries only, event geometry distributions relating to the three-dimensional structures (before the projection) were derived using an image reconstruction technique [22].…”

Three-body Reaction Dynamics in Dissociative Recombination

“…Using a statistical model to describe the process, they reached good agreement with those experimental data previously obtained at CRYRING [5] as a function of reaction energy. [6] It is interesting to examine similar systems in detail to see if more insight can be obtained into the dynamical/statistical nature of the DR process. Furthermore, it will be instructive to examine larger systems, especially systems with molecular fragments, to see if information can be obtained on how much of the available reaction energy goes into internal excitation of the molecular fragments.…”