Time dependent optogalvanic reaction and stability to disturbance of an optogalvanic circuit with hollow cathode discharge

Zhechev, D.; Atanassova, S.

doi:10.1016/s0030-4018(98)00442-8

Cited by 15 publications

(10 citation statements)

References 10 publications

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“…5(a)-5(d). Similar types of phenomena have been observed by Jung et al [19,20] and Zhechev and Atanassova [21] in hollow cathode geometry with different kinds of buffer gas atoms. Figure 5(a) shows an OG signal just near the I-V point of inflection in the negative resistance region (R d < 0).…”

Section: Resultssupporting

confidence: 85%

Laser-induced optogalvanic signal oscillations in miniature neon glow discharge plasma

Saini

2013

Appl. Opt.

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Laser-induced optogalvanic (OG) signal oscillations detected in miniature neon glow discharge plasma are investigated using a discharge equivalent-circuit model. The damped oscillations in OG signal are generated when a pulsed dye laser is tuned to a specific neon transition (1s5→2p2) at 588.2 nm under the discharge conditions where dynamic resistance changes its sign. Penning ionization via quasi-resonant energy transfer collisions between neon gas atoms in metastable state and sputtered electrode atoms in ground state is discussed to explain the negative differential resistance properties of discharge plasma that are attributed to oscillations in the OG signal. The experimentally observed results are simulated by analyzing the behavior of an equivalent discharge-OG circuit. Good agreement between theoretically calculated and experimental results is observed. It is found that discharge plasma is more sensitive and less stable in close vicinity to dynamic resistance sign inversion, which can be useful for weak-optical-transition OG detection.

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Section: Resultssupporting

confidence: 85%

Laser-induced optogalvanic signal oscillations in miniature neon glow discharge plasma

Saini

2013

Appl. Opt.

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“…This signal is identical in shape to that observed on the transition 1s 5 − 2p 8 (NeI 633.4 nm) in the same Ne/Cd lamp with an i -value of 1.6 mA (to be published). Earlier TROGSs of similar shape and independence on the excitation wavelength of the OPO (λ) were observed near I-V inflection points [9]. In the vicinity of this point the TROGS was found to be degraded by poorer stability of the HCD.…”

Section: Aligned ↔ Oriented Ensemble Of Atomsmentioning

confidence: 82%

“…Thus the TROGS in figure 3d should not be analyzed in terms of coherence only. There are various hypotheses regarding the channels forming a TROGS [8][9][10][11][12]. In order to analyze a TROGS it is imperative to consider the measured ΔU OG (t) response as a convolution of the proper plasma OG reaction and that of the monitoring circuit [9].…”

Section: Aligned ↔ Oriented Ensemble Of Atomsmentioning

confidence: 99%

“…Since the diameters of the cathode cavities are almost identical the operating buffer s pressure is also identical. A reasonable proposal for the mechanism might be Penning ionization with rates that are specific for any pair of HCDs [9].…”

Section: Aligned ↔ Oriented Ensemble Of Atomsmentioning

confidence: 99%

“…The measurement of the ensemble of Ne atoms that are aligned ↔ oriented successively (case ii above) is performed by introducing pulsed light alignment/orientation. The light-induced galvanic response is known as an optogalvanic signal or more specifically the time-resolved optogalvanic signal (TROGS) [8,9] in this case. TROGSs from aligned/oriented atoms were studied by using an optical parametric oscillator system, model: Continuum Surelite T M OPO which provided a pulse of duration 4 ns at a repetition rate of 10 Hz.…”

Section: Experimental Partmentioning

confidence: 99%

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On the Conductance of the Gas Discharge Plasma at Space Anisotropic Excitation

Zhechev

Steflekova

Costello

et al. 2015

Contrib. Plasma Phys.

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The galvanic manifestation of two transformations of degenerate magnetic states of the neon atom, namely self-alignment → non-alignment and alignment ↔ orientation is studied by monitoring the voltage across the discharge in a range of hollow cathode discharge (HCD) lamps. The application of a magnetic field to the discharge disorders the self-alignment. Alignment and orientation are optically induced and their effect on the discharge conductance is compared by measuring the optogalvanic signals. The degenerate states investigated are found to contribute to the gas discharge conductance in a manner which depends on their degree of coherence. Various hollow cathode discharge media are studied including Ne/As, Ne/Cu, Ne/Ni, Ne/Cd, Ne/Li and Ne/Ca in the corresponding trademarked HCD spectral lamps.

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