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Superposition of low-pressure DBD and RF induction discharge for spectroscopic study of dissociative recombination in decaying plasma. / Ivanov, Vladimir.
в: Plasma Sources Science and Technology, Том 29, № 4, 045022, 04.2020, стр. 045022.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Superposition of low-pressure DBD and RF induction discharge for spectroscopic study of dissociative recombination in decaying plasma
AU - Ivanov, Vladimir
PY - 2020/4
Y1 - 2020/4
N2 - The aim of the work was to find the optimal way to set up an experiment for spectroscopic study of the dissociative recombination of molecular ions with electrons in low electron density plasma at low gas pressure. In such an experiment, the influence of inelastic atom- atom collisions on the distribution of the DR flux over the excited atomic levels can be excluded. The first results of an experiment on combining a low-frequency barrier discharge (DBD) in neon at a pressure of less than 1 Torr with a pulsed radio-frequency (RF) induction discharge are presented. To create the plasma, we used DBD in a cylindrical glass tube with an inner diameter of 3.9 cm, which forms the spatial distribution of electron density with a minimum on the axis of the tube. The evolution of such a spatial distribution due to ambipolar diffusion in the initial stage of plasma decay provides an influx of charged particles to the center of the discharge tube, which increases the afterglow duration and helps to overcome the difficulties of detecting weak plasma radiation. The specific features of the DBD also appeared in the ionic composition of the plasma, which contained, in addition to Ne + and Ne2 +, tht Ne ++ ions, whose recombination with electrons significantly enriched the afterglow spectrum in the short-wavelength region. An RF discharge was used for pulsed heating of electrons in the afterglow. It is shown that, in accordance with the ionic composition of the plasma, the radiation of a decaying plasma is presented by three groups of spectral lines with characteristic time behavior and the electron temperature dependence. The advantages of the proposed approach for studying the mechanism of dissociative recombination are discussed.
AB - The aim of the work was to find the optimal way to set up an experiment for spectroscopic study of the dissociative recombination of molecular ions with electrons in low electron density plasma at low gas pressure. In such an experiment, the influence of inelastic atom- atom collisions on the distribution of the DR flux over the excited atomic levels can be excluded. The first results of an experiment on combining a low-frequency barrier discharge (DBD) in neon at a pressure of less than 1 Torr with a pulsed radio-frequency (RF) induction discharge are presented. To create the plasma, we used DBD in a cylindrical glass tube with an inner diameter of 3.9 cm, which forms the spatial distribution of electron density with a minimum on the axis of the tube. The evolution of such a spatial distribution due to ambipolar diffusion in the initial stage of plasma decay provides an influx of charged particles to the center of the discharge tube, which increases the afterglow duration and helps to overcome the difficulties of detecting weak plasma radiation. The specific features of the DBD also appeared in the ionic composition of the plasma, which contained, in addition to Ne + and Ne2 +, tht Ne ++ ions, whose recombination with electrons significantly enriched the afterglow spectrum in the short-wavelength region. An RF discharge was used for pulsed heating of electrons in the afterglow. It is shown that, in accordance with the ionic composition of the plasma, the radiation of a decaying plasma is presented by three groups of spectral lines with characteristic time behavior and the electron temperature dependence. The advantages of the proposed approach for studying the mechanism of dissociative recombination are discussed.
KW - Collisional-radiative recombination
KW - Dielectric-barrier discharge
KW - Dissociative recombination
KW - Low-pressure plasma
KW - Molecular ions
KW - Optical emission spectroscopy
KW - Radio-frequency discharge
KW - ION-CONVERSION PROCESSES
KW - low-pressure plasma
KW - optical emission spectroscopy
KW - dielectric-barrier discharge
KW - collisional-radiative recombination
KW - MOLECULAR-IONS
KW - AFTERGLOW
KW - TOTAL RATE COEFFICIENT
KW - molecular ions
KW - ELECTRON-TEMPERATURE DEPENDENCE
KW - radio-frequency discharge
KW - NEON
KW - EXCITED-STATE PRODUCTION
KW - ATOMS
KW - BARRIER DISCHARGE
KW - HELIUM
KW - dissociative recombination
UR - https://iopscience.iop.org/article/10.1088/1361-6595/ab7f4c
UR - http://www.scopus.com/inward/record.url?scp=85085243273&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/ec656b40-4e2d-3761-b908-17a76ba2e2a6/
U2 - 10.1088/1361-6595/ab7f4c
DO - 10.1088/1361-6595/ab7f4c
M3 - Article
VL - 29
SP - 045022
JO - Plasma Sources Science and Technology
JF - Plasma Sources Science and Technology
SN - 0963-0252
IS - 4
M1 - 045022
ER -
ID: 52241545