Electron energy spectra in helium observed in a microplasma collisional electron spectroscopy detector

Kudryavtsev, A. A.; Mustafaev, A. S.; Цыганов, А. Б.; Chirtsov, A. S.; Yakovleva, V. I.

doi:10.1134/s1063784212100106

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…In the proposed variant of the CES method [4,5], the identification of atomic or molecular impurities is based on selective registration of groups of fast electrons e f , released in the reaction of Penning ionization of the impurity particles by helium metastable atoms:…”

Section: Brief Description Of the Proposed Variant Of The Ces Methodsmentioning

confidence: 99%

“…From absolute measurements of the densities of penning electrons and helium metastable atoms and the known rate constants for the reaction (2.1), the density of the investigated substance can be determined [1][2][3][4][5].…”

Section: Brief Description Of the Proposed Variant Of The Ces Methodsmentioning

confidence: 99%

“…In contrast to the classical electron spectroscopy, which requires high vacuum for its use [8], the method of CES [4,5] allows to measure the energy spectra of the electrons released in reactions of Penning ionization (2.1) and to determine their energy E p in collisional regime at high pressures. This opportunity is associated with the fact that in one elastic collision with a helium atom, the electron loses only a small portion δ of its initial kinetic energy E p ,…”

Section: Brief Description Of the Proposed Variant Of The Ces Methodsmentioning

confidence: 99%

“…The method of collisional electron spectroscopy (CES), whose basic principles are patented in [4,5] employs the negative glow plasma of a short dc microdischarge as most suitable medium for nonlocal formation of the EEDF and for creation of a compact gas analyzer, operating at high pressures (up to atmospheric). The CES method enables identification of gas impurities in a main gas in collisional regime, where the different groups of electrons do not relax in energy by collisions in the volume and behave independently of each other.…”

Section: Jinst 7 P07002mentioning

confidence: 99%

“…Another way, which is implemented in this paper, is to employ the nonlocal plasma of a short dc glow discharge [5]. Such plasma is characterized by low temperature Maxwellian electrons and its features are much similar to the afterglow plasma [13].…”

Section: Jinst 7 P07002mentioning

confidence: 99%

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Registration of gas impurities in nonlocal plasma of helium microdischarge by an additional electrode — sensor

Kudryavtsev¹,

Pramatarov²,

Stefanova³

et al. 2012

J. Inst.

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Identification of gas impurities in helium by selective registration of groups of fast electrons created in Penning ionization of impurities atoms or molecules by metastable helium atoms at pressures of 7-40 Torr is realized. The collisional electron spectroscopy (CES) method is applied and is experimentally verified. Identification of impurities atoms and molecules is accomplished in collisional regime of movement of the particles, where the different groups of electrons have no time to relax in energy by collisions in the volume and behave independently of each other. An original design of microplasma gas analyzer is proposed, containing only nonlocal negative glow plasma of a short dc microdischarge. Registration of the energy spectra of penning electrons by means of an additional electrode-sensor, located at the boundary of the discharge volume is performed. The sensor has large collecting area compared to classical Langmuir probes, contributing to significant enhancement in the measurements sensitivity. Maxima in the EEDF are recorded in helium with small admixtures of krypton, argon and air. The obtained maxima appear at low discharge currents and at characteristic energies corresponding exactly to the expected maxima for penning electrons of the known gas impurities used. The gas analyser is compact, simple in technical performance, has high sensitivity and its size is dramatically reduced compared to the existing devices for gas analysis. This work is an approach to the development of microdischarge gas analyzers for gas impurities detection like poison gases, gas pollutions in the atmosphere or in the industry etc.

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Section: Brief Description Of the Proposed Variant Of The Ces Methodsmentioning

confidence: 99%

Section: Brief Description Of the Proposed Variant Of The Ces Methodsmentioning

confidence: 99%

Section: Brief Description Of the Proposed Variant Of The Ces Methodsmentioning

confidence: 99%

Section: Jinst 7 P07002mentioning

confidence: 99%

Section: Jinst 7 P07002mentioning

confidence: 99%

See 3 more Smart Citations

Registration of gas impurities in nonlocal plasma of helium microdischarge by an additional electrode — sensor

Kudryavtsev¹,

Pramatarov²,

Stefanova³

et al. 2012

J. Inst.

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“Ion sputtering – thermal separation” technology for spent nuclear fuel processing

Petrovskaya

Цыганов

Surov

et al. 2022

Nuclear Engineering and Design

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Use of nonlocal helium microplasma for gas impurities detection by the collisional electron spectroscopy method

2015

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The collisional electron spectroscopy (CES) method, which lays the ground for a new field for analytical detection of gas impurities at high pressures, has been verified. The CES method enables the identification of gas impurities in the collisional mode of electron movement, where the advantages of nonlocal formation of the electron energy distribution function (EEDF) are fulfilled. Important features of dc negative glow microplasma and probe method for plasma diagnostics are applied. A new microplasma gas analyzer design is proposed. Admixtures of 0.2% Ar, 0.6% Kr, 0.1% N2, and 0.05% CO2 are used as examples of atomic and molecular impurities to prove the possibility for detecting and identifying their presence in high pressure He plasma (50–250 Torr). The identification of the particles under analysis is made from the measurements of the high energy part of the EEDF, where maxima appear, resulting from the characteristic electrons released in Penning reactions of He metastable atoms with impurity particles. Considerable progress in the development of a novel miniature gas analyzer for chemical sensing in gas phase environments has been made.

show abstract

Electron energy spectra in helium observed in a microplasma collisional electron spectroscopy detector

Cited by 8 publications

References 3 publications

Registration of gas impurities in nonlocal plasma of helium microdischarge by an additional electrode — sensor

Registration of gas impurities in nonlocal plasma of helium microdischarge by an additional electrode — sensor

“Ion sputtering – thermal separation” technology for spent nuclear fuel processing

Use of nonlocal helium microplasma for gas impurities detection by the collisional electron spectroscopy method

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