Photon-stimulated recombination of self-trapped holes with electrons in pre-irradiated solid Ar

Gumenchuk, G. B.; Bludov, M. A.; Белов, А. Г.

doi:10.1063/1.1867313

Cited by 7 publications

(8 citation statements)

References 19 publications

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“…Therefore, thermo-or photostimulated electrons leave the traps and initiate neutralization reactions. It was shown that such electrons are responsible for luminescence observed in cryocrystals [39,41]. We suggest similar processes were observed in cryocondensates [42][43][44] and impurity nanoclusters [23] at temperatures below 10 K when the atoms are still immobile in solids.…”

Section: "Cold" and "Hot" Thermoluminescence Spectra From Ihcsmentioning

confidence: 62%

On charged impurity structures in liquid helium

Pelmenev

Krushinskaya

Bykhalo

et al. 2016

Low Temperature Physics

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The thermoluminescence spectra of impurity-helium condensates (IHC) submerged in superfluid helium have been observed for the first time. Thermoluminescence of impurity-helium condensates submerged in superfluid helium is explained by neutralization reactions occurring in impurity nanoclusters. Optical spectra of excited products of neutralization reactions between nitrogen cations and thermoactivated electrons were rather different from the spectra observed at higher temperatures, when the luminescence due to nitrogen atom recombination dominates. New results on current detection during the IHC destruction are presented. Two different mechanisms of nanocluster charging are proposed to describe the phenomena observed during preparation and warmup of IHC samples in bulk superfluid helium, and destruction of IHC samples out of liquid helium.

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Section: "Cold" and "Hot" Thermoluminescence Spectra From Ihcsmentioning

confidence: 62%

On charged impurity structures in liquid helium

Pelmenev

Krushinskaya

Bykhalo

et al. 2016

Low Temperature Physics

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“…The first results demonstrating reliability of this mechanism are presented in [14]. The experiments on stimulation of relaxation processes by laser light [2,15] provide an additional proof of the mechanisms discussed.…”

Section: Methodsmentioning

confidence: 84%

Oxygen-driven relaxation processes in pre-irradiated Ar cryocrystals

Savchenko

Белов

Gumenchuk

et al. 2006

Low Temperature Physics

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Relaxation processes in oxygen-containing Ar cryocrystals pre-irradiated by low-energy electrons are studied with the focus on the role of diffusion controlled atom-atom recombination reaction of oxygen in the relaxation cascades. The results of correlated in real time measurements of thermally stimulated phenomena are presented. The experiments have been performed using activation spectroscopy methods -thermally stimulated exoelectron emission and spectrally resolved thermally stimulated luminescence. Solid evidence of the radiative mechanism of electron detrapping triggering the relaxation cascades is obtained.

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“…Electrons in the conduction band have several possibilities: to escape the sample directly [5,6,9,10], or to recombine radiatively with positively charged centers [6,10,13]. The reaction of intrinsic recombination can lead to the desorption of neutral atoms [5,6].…”

Section: Activation Spectroscopymentioning

confidence: 99%

“…There are only a few publications dedicated to PSEE [5,10,12] and to the intrinsic VUV recombination luminescence caused by an external photon source [13].…”

mentioning

confidence: 99%

Photon‐stimulated charge recombination and exoelectron emission from pre‐irradiated solid Ar

Gumenchuk¹,

Bludov²,

Белов³

et al. 2007

Phys. Status Solidi (c)

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Spatially separated stable charge centers -self-trapped holes, trapped electrons, dopant ionic centers and radicals were generated in an Ar matrix doped with Xe and N 2 by a low energy electron beam. A combination of the cathodoluminescence (CL) with the photon-stimulated luminescence (PSL) and photonstimulated exoelectron emission (PSEE) methods was used to monitor center formation and selected relaxation channels -charge recombination reactions and exoelectron emission. PSEE from pre-irradiated Ar samples was registered simultaneously with N line emission. Vacuum ultraviolet (VUV) intrinsic and extrinsic recombination luminescence from pre-irradiated samples has been detected to confirm the suggested relaxation path of the stored energy. An afterglow of the N line can be considered as an internal source of photons which releases electrons from the traps and being a triggering mechanism of relaxation processes: (i) -exoelectron emission, (ii) -radiative recombination of charge species. 1 Introduction An exposure of solid insulators to ionizing radiation results in generation of metastable centers such as self-trapped/trapped charge carriers and structural defects. Spatially separated charge carriers remain stable at low temperatures after completing irradiation. Relaxation processes can be stimulated by heating or by photon flux. In our study we focused on the photon-stimulated relaxation.Methods of activation spectroscopy are especially powerful tools for the investigation of a relaxation in solids and the method of thermally stimulated luminescence (TSL) is the most common in use [1][2][3][4][5][6][7]. Recent experiments revealed thermally stimulated exoelectron emission (TSEE) from solid Ne [8] and Ar [9,10]. The latter studies showed a correlation in the yields of exoelectrons and VUV photons of the intrinsic recombination emission from pre-irradiated solid Ar. It was suggested [11] and then demonstrated [5,6,10] that thermally stimulated recombination of neutral guest O atoms in Ar matrix followed by O 2 * formation at 23 K and radiative decay of O 2 results in the emission of exoelectrons from solid Ar. It posed the question on the influence of visible light on the relaxation path in rare-gas solids (RGS).Relaxation processes in RGS are still not clearly understood. There are only a few publications dedicated to PSEE [5,10,12] and to the intrinsic VUV recombination luminescence caused by an external photon source [13].We present new results -relaxation channels involving photon-stimulated radiative recombination (intrinsic and extrinsic) of charge centers with electrons in VUV range and corresponding PSEE.

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Photon-stimulated recombination of self-trapped holes with electrons in pre-irradiated solid Ar

Cited by 7 publications

References 19 publications

On charged impurity structures in liquid helium

On charged impurity structures in liquid helium

Oxygen-driven relaxation processes in pre-irradiated Ar cryocrystals

Photon‐stimulated charge recombination and exoelectron emission from pre‐irradiated solid Ar

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