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4 Opto-Electronics Review

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Radial inhomogeneity in a shape of spectral line emitted from hollow cathode discharge

100%

Parvanova N.

2003

tom Vol. 11, No. 4

345-347

The Lorentzian width of the spectral line Hel 504.7 nm emitted in the negative glow of a hollow cathode discharge (HCD) was found to increase depending on the distance from the emitting volume to the cathode axis. This effect manifests itself at low buffer gas pressures pHe E[epsolon](0.0-0.28) Torr. The later is typical for the experiments on SFS, radiative width and other constants. Thus, the observed radial inhomogeneity concerns the accuracy of these measurements. It is checked by determination of radiative width of the Hel 504.7 nm line emitted by two regions along the radius of HCD.

Photoelectron emission and its instrumental effect on optogalvanic measurements in a hollow cathode discharge

88%

Zhechev D. , Bundaleska N. , Costello J. T. , Todorov D.

2005

tom Vol. 13, No. 3

193-196

The photoelectron emission (PE) from the cathode surface of a hollow cathode discharge (HCD) with a sub-breakdown bias applied, and hence no discharge present, was measured within the framework of an optogalvanic (OG) experimental arrangement. The work function dependence on the applied sub-breakdown voltage was investigated. The PE component in a real OG measurement was found to manifest itself as an instrumental effect together with nonresonant ionization which we call here space ionization (SP). The convolution of these components was determined experimentally as an instrumental function. A deconvolution procedure to determine the actual OG signal was developed.

Anomalous optogalvanic signal : spectrometric applications

88%

Zhechev D. , Parvanova N.

2003

tom Vol. 11, No. 1

31-34

Along with the conventional optogalvanic (OG) signal an anomalous ligh-induced response has been detected in hollow cathode discharge. This response manifests itself both in the amplitude and time-resolved OG reactions. The anomalous OG signal is found to be less dependent on the absorbing optical transition and yet, more informative on the parameters of the plasma medium, that is the OG detector. This circumstance is proposed for usage in four applications based on the behaviour of the anomalous OG signal. The latter is taken as a spectral marker, as an amplified quasi-amplitude signal as well as a sensitive tool in monitoring procedure.

Excitation space anisotropy, coherence and coherent conductivity in hollow cathode discharge

75%

Zhechev D. , Parvanova N.

2003

tom Vol. 11, No. 1

51-54

Based on the excitation space anisotropy a partial polarisation of the spontaneous emission is found in hollow cathode discharge. This polarisation is ascribed to existing spontaneous coherence, i. e., self-alignment of the excited states. The aligning factors are the beam-like fast electrons from the cathode dark space. An expression for observed signal of the spontaneous emission magnetic depolarisation is obtained. Withim the frames of the ordinary opto-galvanic effect a separate coherent conductivity is analysed. a poor coherent conductivity due the self-aligned states is detected.