Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Вестник Санкт-Петербургского университета. Серия 4. Физика. Химия

Влияние интерференции атомных состояний на гальванические свойства плазмы газового разряда

А. П. Горбенко, A. Ya. Polishchuk, Г. Ц. Тодоров, Dimo Zhechev

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

Comparative studies of magneto-optical (MO) resonances and magneto-galvanic (MG) responses with and without resonant laser irradiation are earned out to establish the interconnection of the effects and the influence of the selfalignment destruction on the MO signal in positive column discharge. These studies aim to clarify the possible formation mechanisms of the neon Is, (2p 53s) states coherences and to examine the possibility to use the galvanic resonances for estimation of the relaxation constants of the neon lr state.

Related papers

Self-induced coherence and conductivity of glow discharge

L. Petrov, Dimitar G. Slavov, Vladimir R. Arsov +5 more

Comparative studies of MO resonances and MG responses with and without resonant laser irradiation were carried out to establish the interconnection of the effects and the influence of the self-alignment destruction on the MO signal in positive column discharge. These studies aim to clarify the possible formation mechanisms of the neon 1 si (2p53s) states coherences and to examine the possibility to use the galvanic resonances for estimation of the relaxation constants of the neon 1 s5 state.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Mar 2, 2007•0 citations

Peculiarities of the magneto-optical resonances on 2p53s states in a NE glow discharge

А. П. Горбенко, Alexander Kuzmin, Vladimir A. Polischuk +4 more

In continuation of our previous works, systematic investigation of the magneto-optical (MO) resonances from the 3P1(1s4) (Pashen notation), 3P2 (1s5), and 3P0 (1s3) levels of NeI was carried out. This study aims to clarify the formation mechanisms of the neon 1si (2p53s) states coherences. Anomalous MO resonances are experimentally observed and the possible mechanisms of their creation are discussed.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jun 15, 2007•0 citations

Disalignment of excited atoms by radiation re-absorption: neon 2p2atoms in a discharge plasma

Manabu Seo, Masanori Nimura, Masahiro Hasuo +1 more

In a positive column of a glow discharge, a linearly polarized laser pulse produces aligned neon atoms in the 2p 2 (Paschen notation) level, and the subsequent fluorescence is observed with its polarized components resolved. The relaxation rate of the alignment, or the disalignment rate, is thus determined. The populations of the 1s 2 – 1s 5 levels are found to be strongly dependent on the discharge current, and so are the degrees of radiation re-absorption of the transition lines from 2p 2 to these levels. A Monte Carlo simulation is performed by which the disalignment rate by radiation re-absorption for these transitions is determined, where the isotope splitting of the transition lines is taken into account. This rate is subtracted from the observed disalignment rate, resulting in the rate being independent of the degree of radiation re-absorption. Thus, disalignment due to atom collisions and that due to radiation re-absorption are separated. For the latter disalignment the disalignment rate deduced by the simulation, treating the four transitions simultaneously, is found to be virtually equal to the sum of the disalignment rates for each of the transitions. The approximate expression for the disalignment rate given by D’Yakonov and Perel’ (1965 Sov. Phys.–JETP 20 997) is quantified, so that it can be applied to estimating the disalignment rate of an upper level having several transition lines with finite optical thickness.

Journal of Physics B Atomic Molecular and Optical Physics•Apr 24, 2003•15 citations

Experimental investigation of hidden alignment in Ne plasma using linear laser magneto-optical spectroscopy

V.A. Polischuk, Emilia A. Alipieva

Summary form only given, as follows. We investigated the hidden alignment of Ne plasma in a magnetic field observing the optical characteristics of the medium-absorption and refraction. A tunable single frequency laser beam was used as a probe beam. Depending on the direction of the applied magnetic field and the geometry of observation, the dependence of the plasma birefringence or dichroism on the magnetic field was registered. The dye laser was tuned to /spl lambda/=607.4 nm (2p/sub 3/-1s/sub 4/ Ne transition). The dependence on the external magnetic field of the laser beam intensity passed through the Ne discharge cell was registered, for various laser frequencies in the limits of the absorption line. At the edge of the absorption line, the signal of the dichroism consists of two Lorentzian components while at the center of the absorption line the wide component is absent. The wide component width depends on neon pressure as: H(P)=(1.64/spl plusmn/0.03) gauss + P(torr) (0.33/spl plusmn/0.08) gauss/torr. This value is in a good agreement with other results concerning the lifetime of the 1s/sub 4/ state. The mechanism of alignment formation in this state is not clear. This state could not be aligned by light absorption following a quantitative calculation. The irradiation of atoms is isotropic within the limits of all the absorption line because of the high magnitude of absorption for the 1s/sub 4/-1s/sub 0/ transition. We consider the optical pumping as the most probable mechanism for alignment of this state. The magnitude of absorption on the s-p neon transitions are not high. The intensity of the spontaneous emission beam along the tube is greater than in the perpendicular direction. If the quantization axis coincides with the tube axis, this beam empties the magnetic sublevels with M=/spl plusmn/1, thus creating longitudinal alignment. The absence of a signal at the center of the absorption line can be explained by the high selfabsorption on the s-p transitions. The width of the narrow component of the signal is approximately 0.7 gauss. Its pressure dependence is small. We have established experimentally the absence of signals of such width in the spontaneous emission from 2p levels. Hence, all optical mechanisms of alignment transmission from higher or from lower states to the 1s/sub 4/ state are excluded. Apparently this signal arises from alignment of metastable state 1s/sub 5/. In our opinion the collisions are the most probable mechanism of alignment transmission.

Trans Black Sea Region Symposium on Applied Electromagnetism•Nov 11, 2002•0 citations

Narrow high-order magnetooptic resonances in neon utilizing the 3s2–2p4transition

Э. Г. Сапрыкин, V P Soldatov, V. A. Sorokin

Under conditions of interaction between a high-intensity traveling laser wave and the 3s2–2p4 neon transition, a narrow component due to saturation of high-order absorption was recorded in a difference magnetooptic resonance. This component was due to field-induced coherence between magnetic sublevels with the quantum numbers ±2 of the 2p4 level (hexadecapole moment) and was used to determine the relaxation constant Γ4n. The collisional broadening ∂Γ4n/∂p determined as a result of a mathematical analysis of the magnetic spectrograms was 3 ± 0.3 MHz/Torr. The collisional broadening of the alignment relaxation constant of the 2p4 level measured under the same conditions was 4 ± 0.2 MHz/Torr.

Soviet Journal of Quantum Electronics•Oct 31, 1986•0 citations

Galvanic manifestation of coherent degenerate Zeeman sublevels in a gas discharge

Vasilka Steflekova, Dimo Zhechev

The degenerate Zeeman sublevels were found to contribute to the ionization in a gas discharge in accordance with their coherent state. The voltage across the discharge was monitored while the same ensemble of excited atoms was alternately self-aligned ↔ nonaligned or oriented ↔ aligned. In the latter case, the coherence was optically induced; the corresponding opto-galvanic signals, i.e. amplitude- and time-resolved ones, were compared. Each state of the ensemble of degenerate Zeeman sublevels, i.e. (self-) aligned, oriented or disordered was characterized by its own rate of ionization. Various hollow cathode discharge (HCD) media were studied, namely, Ne/As, Ne/Cu, Ne/Ni, Ne/Cd, Ne/Li and Ne/Si in the corresponding commercial HCD spectral lamps.

Journal of Physics Conference Series•May 15, 2014•0 citations
Comparative studies of magneto-optical (MO) resonances and magneto-galvanic (MG) responses with and without resonant laser irradiation are earned out to establish the interconnection of the effects and the influence of the selfalignment destruction on the MO signal in positive column discharge. These studies aim to clarify the possible formation mechanisms of the neon Is, (2p 53s) states coherences and to examine the possibility to use the galvanic resonances for estimation of the relaxation constants of the neon lr state.
In a positive column of a glow discharge, a linearly polarized laser pulse produces aligned neon atoms in the 2p 2 (Paschen notation) level, and the subsequent fluorescence is observed with its polarized components resolved. The relaxation rate of the alignment, or the disalignment rate, is thus determined. The populations of the 1s 2 – 1s 5 levels are found to be strongly dependent on the discharge current, and so are the degrees of radiation re-absorption of the transition lines from 2p 2 to these levels. A Monte Carlo simulation is performed by which the disalignment rate by radiation re-absorption for these transitions is determined, where the isotope splitting of the transition lines is taken into account. This rate is subtracted from the observed disalignment rate, resulting in the rate being independent of the degree of radiation re-absorption. Thus, disalignment due to atom collisions and that due to radiation re-absorption are separated. For the latter disalignment the disalignment rate deduced by the simulation, treating the four transitions simultaneously, is found to be virtually equal to the sum of the disalignment rates for each of the transitions. The approximate expression for the disalignment rate given by D’Yakonov and Perel’ (1965 Sov. Phys.–JETP 20 997) is quantified, so that it can be applied to estimating the disalignment rate of an upper level having several transition lines with finite optical thickness.
Summary form only given, as follows. We investigated the hidden alignment of Ne plasma in a magnetic field observing the optical characteristics of the medium-absorption and refraction. A tunable single frequency laser beam was used as a probe beam. Depending on the direction of the applied magnetic field and the geometry of observation, the dependence of the plasma birefringence or dichroism on the magnetic field was registered. The dye laser was tuned to /spl lambda/=607.4 nm (2p/sub 3/-1s/sub 4/ Ne transition). The dependence on the external magnetic field of the laser beam intensity passed through the Ne discharge cell was registered, for various laser frequencies in the limits of the absorption line. At the edge of the absorption line, the signal of the dichroism consists of two Lorentzian components while at the center of the absorption line the wide component is absent. The wide component width depends on neon pressure as: H(P)=(1.64/spl plusmn/0.03) gauss + P(torr) (0.33/spl plusmn/0.08) gauss/torr. This value is in a good agreement with other results concerning the lifetime of the 1s/sub 4/ state. The mechanism of alignment formation in this state is not clear. This state could not be aligned by light absorption following a quantitative calculation. The irradiation of atoms is isotropic within the limits of all the absorption line because of the high magnitude of absorption for the 1s/sub 4/-1s/sub 0/ transition. We consider the optical pumping as the most probable mechanism for alignment of this state. The magnitude of absorption on the s-p neon transitions are not high. The intensity of the spontaneous emission beam along the tube is greater than in the perpendicular direction. If the quantization axis coincides with the tube axis, this beam empties the magnetic sublevels with M=/spl plusmn/1, thus creating longitudinal alignment. The absence of a signal at the center of the absorption line can be explained by the high selfabsorption on the s-p transitions. The width of the narrow component of the signal is approximately 0.7 gauss. Its pressure dependence is small. We have established experimentally the absence of signals of such width in the spontaneous emission from 2p levels. Hence, all optical mechanisms of alignment transmission from higher or from lower states to the 1s/sub 4/ state are excluded. Apparently this signal arises from alignment of metastable state 1s/sub 5/. In our opinion the collisions are the most probable mechanism of alignment transmission.
Under conditions of interaction between a high-intensity traveling laser wave and the 3s2–2p4 neon transition, a narrow component due to saturation of high-order absorption was recorded in a difference magnetooptic resonance. This component was due to field-induced coherence between magnetic sublevels with the quantum numbers ±2 of the 2p4 level (hexadecapole moment) and was used to determine the relaxation constant Γ4n. The collisional broadening ∂Γ4n/∂p determined as a result of a mathematical analysis of the magnetic spectrograms was 3 ± 0.3 MHz/Torr. The collisional broadening of the alignment relaxation constant of the 2p4 level measured under the same conditions was 4 ± 0.2 MHz/Torr.
The degenerate Zeeman sublevels were found to contribute to the ionization in a gas discharge in accordance with their coherent state. The voltage across the discharge was monitored while the same ensemble of excited atoms was alternately self-aligned ↔ nonaligned or oriented ↔ aligned. In the latter case, the coherence was optically induced; the corresponding opto-galvanic signals, i.e. amplitude- and time-resolved ones, were compared. Each state of the ensemble of degenerate Zeeman sublevels, i.e. (self-) aligned, oriented or disordered was characterized by its own rate of ionization. Various hollow cathode discharge (HCD) media were studied, namely, Ne/As, Ne/Cu, Ne/Ni, Ne/Cd, Ne/Li and Ne/Si in the corresponding commercial HCD spectral lamps.