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Experimental studies of fast fragments of H Rydberg matter

Journal article
Authors Shahriar Badiei
Leif Holmlid
Published in Journal of Physics B-Atomic Molecular and Optical Physics
Volume 39
Issue 20
Pages 4191-4212
Publication year 2006
Published at Department of Chemistry
Pages 4191-4212
Language en
Links <Go to ISI>://000242475700017
Keywords TIME-OF-FLIGHT, UNIFORM ELECTRIC-FIELD, DOUBLY EXCITED-STATES, POTASSIUM PROMOTER, HYDROGEN-ATOM, STIMULATED-EMISSION, COULOMB, EXPLOSIONS, ENERGY-RELEASE, IRON CATALYSTS, KINETIC-ENERGY
Subject categories Physical Chemistry

Abstract

A comprehensive pulsed-laser time-of-flight (TOF) study of H Rydberg matter (RM) fragments is presented. The nature of the fragments released with well-defined kinetic energies of 9-24 eV is investigated: the detected fragments are found to be H* in Rydberg states with principal quantum number n > 28. The only way to produce such states is from Coulomb explosions in a pre-formed easily laser-fragmented molecular entity. Non-symmetric angular distributions of the fragments are measured and Coulombic shockwave phenomena are observed, which prove that the phase of origin is not a gas but an RM phase. The fast particles are concluded to be formed in two-, three- and four-particle Coulomb explosion processes in an H RM cluster. Laser intensity variation measurements indicate that between four and six photons with a total energy of 8.8-13 eV take part in the RM fragmentation. This proves that laser-induced processes in H-2 or H-2(+) molecules, even in the RM phase, are excluded for energetic reasons. A feasible H RM formation mechanism is deduced from the signal variation with H-2 pressure, with the dissociation of H-2 on the emitter surface as the rate limiting step. The principal quantum number of H Rydberg species H* reaching the detector is estimated to be n > 32 from a comparison of the calculated ionization rate of the H* species in the electric field inside the detector with measurements.

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