Comparative study of thermo-stimulated luminescence and electron emission of nitrogen nanoclusters and films

Boltnev, R. E.; Bykhalo, I. B.; Krushinskaya, I. N.; Pelmenev, A. A.; Khmelenko, V. V.; Lee, D. M.; Khyzhniy, I. V.; Uyutnov, S. A.; Savchenko, E. V.; Ponomaryov, A. N.; Gumenchuk, G. B.; Bondybey, V. E.

doi:10.1063/1.4807150

Cited by 9 publications

(18 citation statements)

References 22 publications

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“…It is well known that each temperature increase of cryocrystals of rare gases and molecular nitrogen is followed by thermal mobilization of the electrons trapped in shallow traps [24,37,38]. We suggest that the electrons are localized in traps of varying depth (with the different activation energy).…”

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

confidence: 99%

“…This distinction along with last results on currents detected during destruction of IHCs [24,25] had allowed us to suggest existence of two different mechanisms responsible for "cold" and "hot" luminescence from IHCs.…”

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

confidence: 99%

“…The destruction of IHC sample starts with a sublimation of the helium shells surrounding impurity nanoclusters and preventing the recombination of nitrogen atoms stabilized on the nanocluster surfaces. Nitrogen atom recombination produces mainly metastable molecules N 2 (A 3 Σ) observable due to intense luminescence [24,25,27]. Then N 2 (A 3 Σ) molecules contacting with the beaker wall capture the electrons.…”

Section: Formation Of Charged Nanoclusters and Macroscopic Structure mentioning

confidence: 99%

“…The currents detected during destruction of IHC samples containing stabilized radicals have revealed existence of charges in the condensates [24,25]. To find out a sign of charge carriers we have modified the geometry of electrodes (Fig.…”

Section: Currents Accompanying Destruction Of Ihc Samplesmentioning

confidence: 99%

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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: 99%

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

confidence: 99%

Section: Formation Of Charged Nanoclusters and Macroscopic Structure mentioning

confidence: 99%

Section: Currents Accompanying Destruction Of Ihc Samplesmentioning

confidence: 99%

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On charged impurity structures in liquid helium

Pelmenev

Krushinskaya

Bykhalo

et al. 2016

Low Temperature Physics

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“…Recent experiments [8] have revealed ion currents accompanied by luminescence during destruction of nitrogenhelium condensates prepared by condensation of nitrogenhelium gas mixtures (after passing through a radio-frequency (rf) discharge zone) into bulk superfluid helium (He II). We present new experimental results on the detection of optical spectra and ion currents during thermostimulated destruction of impurity-helium condensates (IHCs) prepared from nitrogen-argon-helium and nitrogen-xenon-helium gas mixtures.…”

Section: Introductionmentioning

confidence: 99%

Optical spectroscopy and current detection during warm-up and destruction of impurity–helium condensates

Krushinskaya

Boltnev

Bykhalo

et al. 2015

Low Temperature Physics

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New experimental results on detection of optical spectra and ion currents during destruction of impurity-helium condensates (IHCs) have been obtained. It is shown that emission during IHC sample destruction is accompanied by current pulses, pressure peaks and temperature changes. The molecular bands of excimer molecules XeO* are assigned to molecules stabilized in films of molecular nitrogen covering the heavier cores of impurity clusters which form impurity-helium condensates.

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Defect‐induced electrostatic charging of nitrogen films

Savchenko

Khyzhniy

Uyutnov

et al. 2016

Physica Status Solidi (b)

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Electrostatic charging of nanostructured N2 films was studied employing optical and a current set of emission spectroscopy methods: cathodoluminescence CL, thermally and photon‐stimulated exoelectron emission TSEE, PSEE as well as thermally and photon‐stimulated luminescence TSL, PSL. Concurrently with thermally stimulated yield of electrons the yield of nitrogen particles was detected, so‐called “postdesorption.” An enhancement of the optical emission stemmed from the neutralization reaction N4+ + e → N2* + N2* → N2 + N2 + hν was observed with an exposure to an electron beam. The experiments performed with a variable voltage applied to an electrode for current detection demonstrated significant accumulation of negative charge. The TSEE current in the low‐temperature range was detected at negative voltages up to −30 V. An accumulation of trapped electrons (up to 1016 cm−3) was detected. A possible contribution of N3− in electrostatic charging was assumed. Thermally stimulated yield of negatively charged particles from a N2 film subjected to an electron beam.

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Comparative study of thermo-stimulated luminescence and electron emission of nitrogen nanoclusters and films

Cited by 9 publications

References 22 publications

On charged impurity structures in liquid helium

On charged impurity structures in liquid helium

Optical spectroscopy and current detection during warm-up and destruction of impurity–helium condensates

Defect‐induced electrostatic charging of nitrogen films

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