Observation of laser-induced recombination in merged electron and proton beams

Schramm, U.; Berger, J.; Grieser, M.; Habs, D.; Jaeschke, E.; Kilgus, G.; Schwalm, D.; Wolf, A.; Neumann, R.; Schuch, R.

doi:10.1103/physrevlett.67.22

Cited by 116 publications

(40 citation statements)

References 18 publications

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“…The recent review by Hahn [8] on the electron recombination mentions only one, very special version of LAR process, namely one-photon LAR when the laser is tuned in resonance with the energy of free-bound electron transition, and only emission of photons with this particular energy is considered. The study of this special case was initiated quite long ago [9][10][11][12][13] and remains active in connection with the processes in the storage rings [14][15][16][17][18][19][20], formation of positronium [9] and antihydrogen [21][22][23] and even with possible cosmological manifestations [24]. In all these theoretical studies the laser field was presumed to be weak and its influence on an initial and/or final electron states was neglected, except Refs.…”

Section: Introductionmentioning

confidence: 99%

Multiphoton radiative recombination of electron assisted by a laser field

Kuchiev

Ostrovsky

2000

Phys. Rev. A

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In the presence of an intensive laser field the radiative recombination of the continuum electron into an atomic bound state generally is accompanied by absorption or emission of several laser quanta. The spectrum of emitted photons represents an equidistant pattern with the spacing equal to the laser frequency. The distribution of intensities in this spectrum is studied employing the Keldysh-type approximation, i.e. neglecting interaction of the impact electron with the atomic core in the initial continuum state. Within the adiabatic approximation the scale of emitted photon frequencies is subdivided into classically allowed and classically forbidden domains. The highest intensities correspond to emission frequencies close to the edges of classically allowed domain. The total cross section of electron recombination summed over all emitted photon channels exhibits negligible dependence on the laser field intensity.

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Section: Introductionmentioning

confidence: 99%

Multiphoton radiative recombination of electron assisted by a laser field

Kuchiev

Ostrovsky

2000

Phys. Rev. A

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“…Since the recombination rate depends on the square root of the temperature, it should be enhanced for the decreased temperatures of the plasma after longer trapping times and might then become observable. Second, we are presently preparing a YAG pumped dye laser for laser spectroscopy of trapped ions which could be used for stimulating radiative recombination into high-lying levels of the ions as it has been observed in cooler sections of storage rings [10] and proposed as a promising way to enhance radiative recombination in an H -e + plasma. Third, with one of our newly designed traps it is straightforward to extract the trapped electrons and measure their number as a simple proof of their existence.…”

Section: Prospects and Conclusionmentioning

confidence: 99%

Do Electrons and Ions Coexist in an EBIT?

Lapierre

López‐Urrutia

Braun

et al. 2005

AIP Conference Proceedings

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Abstract. Detailed analysis of an extended exponential tail observed in the decay curve of the 2 P 3/2 -2 P 1/2 magnetic dipole (M1) transition in boron-like Ar 13+ provides evidence that electrons and ions might coexist in the same spatial region in the Heidelberg Electron Beam Ion Trap (HD-EBIT). On this basis, new trapping-cooling-recombination schemes for positron-antiproton plasmas are envisioned, integrated in a magnetic bottle configuration that should be able to trap the subsequently formed recombined cold antihydrogen. Moreover, the EBIT configuration, providing excellent spectroscopic access to the trapping region via seven view ports is shown to be well suited for performing precision spectroscopy of antiprotonic ions. Those might be generated either by recombination of antiprotons with neutral gas atoms or through radiative recombination and state-selective dielectronicrecombination-like processes with highly charged ions produced and stored in the EBIT simultaneously in a nested trap configuration.

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“…The recombination, e + p = H + hv, to be described more fully below, is stimulated by coherent radiation of frequency vo. The dominant envisaged process is stimulated emission from the free particle energy, E, to the virtual state near energy E(2s) - [2] T The epoch is relatively well defined to be 1600 < z < 1100. At the lower limit the homogeneous recombination is complete, while beyond the upper limit the CBR is so hot that it will rapidly reionize any neutral hydrogen produced.…”

Section: Spontaneous Radiation and Recombinationmentioning

confidence: 99%

“…Although earlier work (1) had been pessimistic about the possibility of instabilities at recombination, several developments now offer encouragement to this possibility. Of greatest significance have been the recent actual experiments of Schramm et at (2) and Yousif et at (3) showing that laser-stimulated recombination does indeed occur with cross-section gains of several thousand. [Hogan's more astrophysically motivated concerns are addressed in our companion paper (4)].…”

Section: Introductionmentioning

confidence: 99%

On the possibility of coherently stimulated recombination and cosmological structure generation: recombination instability.

Klemperèr¹,

Luo²,

Rosner³

et al. 1995

Proc. Natl. Acad. Sci. U.S.A.

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Possible instabilities during cosmological recombination may produce an epoch of nonlinear density growth and fractal-like structural patterns out to the horizon scale at that epoch . With this motivation, we examine the consequences of the change in effective radiative recombination reaction rate coefficients produced by intense stimulated emission. The proton-electron recombination is considered as a natural laser, leading to the formation of spatially nonuniform distributions of neutral matter earlier than the recombination epoch.

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Observation of laser-induced recombination in merged electron and proton beams

Cited by 116 publications

References 18 publications

Multiphoton radiative recombination of electron assisted by a laser field

Multiphoton radiative recombination of electron assisted by a laser field

Do Electrons and Ions Coexist in an EBIT?

On the possibility of coherently stimulated recombination and cosmological structure generation: recombination instability.

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