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Physical Review Letters

Experimental observation of laser-stimulated radiative recombination

Farook Bashir Yousif, P. J. T. Van der Donk, Zdenek Kucerovsky, J. Reis, ERIC BRANNEN, J. B. A. Mitchell, T. J. Morgan

Published Jul 1, 1991• 79 citations
Publisher

Abstract

Spontaneous radiative recombination between protons and electrons to form hydrogen atoms with 8\ensuremath{\le}n\ensuremath{\le}19 has been measured. ${\mathrm{CO}}_{2}$ laser light has been shown to induce stimulated radiative recombination to the n=11 and 12 levels with an inferred gain in the cross section of 1720\ifmmode\pm\else\textpm\fi{}860 and 4790\ifmmode\pm\else\textpm\fi{}2830 for a laser power of 12.6 and 15.3 W, respectively. This is in line with that predicted theoretically.

DOI
10.1103/physrevlett.67.26

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Spontaneous radiative recombination between protons and electrons to form hydrogen atoms with 8\ensuremath{\le}n\ensuremath{\le}19 has been measured. CO2{\mathrm{CO}}_{2}CO2​ laser light has been shown to induce stimulated radiative recombination to the n=11 and 12 levels with an inferred gain in the cross section of 1720\ifmmode\pm\else\textpm\fi{}860 and 4790\ifmmode\pm\else\textpm\fi{}2830 for a laser power of 12.6 and 15.3 W, respectively. This is in line with that predicted theoretically.
Stimulated radiative recombination has been demonstrated experimentally in and collisions using a merged electron - ion beams apparatus with field ionization detection of the excited neutral products. Enhancement of the recombination over spontaneous recombination to form the n=11, 12 and 13 levels of atomic hydrogen and the n = 11 and 12 levels of atomic helium by factors of between 1000 and 3000 have been found using a laser power of 8 W. Evidence for the resolution of fine-structure levels has been seen for the case of helium.
The problem of stimulated recombination at a resonance is investigated by a time-dependent, non-perturbative approach. The number of pairs recombined by a laser pulse is computed as a function of the intensity, of the pulse duration, and of the initial electron-energy distribution (as well as of the parameters which characterize the atomic resonance and its field-induced coupling to the final bound state). The role of spontaneous emission (or other paths) from the recombined state (if it is excited) is also discussed. Numerical results are given including an example of recombination to the ground state in the Sr atom.
We report the observation of spontaneous radiative emission during the collision of two excited Ba atoms. The emission occurs at the sum energy of the excited atoms and is the emission analog of the laser-induced inelastic collision process. We measure a collision cross section for deexcitation by spontaneous radiative emission of 2.6\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}20}$ cm2{\mathrm{cm}}^{2}cm2.
A theory is given of radiative collisions, i.e., of elementary events in which the emission of a photon occurs in the course of a collision. Special attention is paid to radiative collisions stimulated by a laser field. Simple but clear approaches formulated in the forties or fifties are described briefly. This theory applies, in particular, to collisions in a strong electromagnetic field which affect the collision dynamics. Chemical radiative collisions, i.e., chemical reactions stimulated by photons absorbed in the course of a collision, are reviewed. An analysis is made of several recent experiments in which the theoretically predicted effects were observed: these include the radiative-collisional transfer of excitation from atom to atom, nonlinear effects due to the influence of the field on the collision dynamics, and photosubstitution of one of the atoms in a halogen molecule with an inert gas atom.
In the present paper two-body radiative recombination rate for the production of antihydrogen Π) in a merged beam of slow positrons (e+) and antiprotons (p -) is studied in the light of a two-step process, which consists of capture in an excited state of II with subsequent decay to the ground state and emission of a photon.Computation is done using the field theory and the Coulomb gauge.Importance of the two-step radiative recombination process relative to the well-known spontaneous photorecombination process, on the two-body radiative recombination rate for antihydrogen formation, is discussed.The present result predicts higher contribution from the two-step radiative recombination process as compared to the spontaneous photorecombination process to the rate of cold antihydrogen formation witl the relative colfision energy below 0.01 Rydberg, near which experiments are being conducted.However, above 0.1 Rydberg the spontaneous photorecombination process dominates over the two-step radiative recombination process.The present result is valid, as well, for the formation of hydrogen atom due to collision between slow edectron and proton.
Two different effects of the blackbody-radiation-induced atomic line broadening are compared. The first one (stimulated Raman scattering) has been discussed by many authors; the second one (quadratic level mixing) was discussed in our previous work. It is shown that the mixing effect gives the most significant contribution to the line broadening and it is indicated how to distinguish these two effects in laboratory experiments. The influence of the level mixing on the recombination history of primordial plasma is also discussed.