Nonlinear plasma spectroscopy of the hydrogen balmer-? line

Weber, E. W.; Frankenberger, R.; Schilling, Moritz

doi:10.1007/bf00688545

Cited by 28 publications

(10 citation statements)

References 17 publications

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“…Thus, one can estimate the plasma density as р10 13 cm Ϫ3 . 30,31 The absence of significant broadening of H ␣ and H ␤ spectral lines is direct proof of the absence of electric fields larger than 10 3 V/cm at a distance several tens of m from the front surface of the ferroelectric. This coincides well with the model of plasma formation which predicts screening of the electric fields of polarization surface charges by the charged plasma particles.…”

Section: Plasma Electron Densitymentioning

confidence: 93%

Spectroscopy of a ferroelectric plasma cathode

Dunaevsky

Chirko

Krasik

et al. 2001

Journal of Applied Physics

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Results of spectroscopic investigations of the plasma formed on the surface of a ferroelectric cathode upon the application of a driving pulse are presented. The ferroelectric plasma cathode was made of a solid solution of Sr, Ba, Ti, Nb, Pb, and O. Its front side was covered by Cu grounded strip electrodes. A driving pulse with an amplitude ≲18 kV and pulse duration of ∼400 ns was applied to the rear Cu disk electrode. A Jobin-Yvon 750M spectrometer was used for visible light dispersion. Spectral line profiles were obtained by a fast framing camera. It was shown that light is emitted from the excited ions and neutral atoms of Cu, Pb, Sr, Ba, Ti, and H within the first 50 ns after the beginning of the driving pulse. By analyzing the Doppler broadening of the observed spectral line profiles it was found that the ion and neutral atom temperature is ⩽0.8 eV. Analysis of the Stark broadening of the Hα and Hβ spectral lines showed the absence of a high (>1 kV/cm) electric field which could be developed at the surface of the ferroelectric due to the appearance of noncompensated surface polarization charges. The same Stark analysis also showed that the plasma density does not exceed 1013 cm−3. By comparing the relative intensities of the Hα and Hβ spectral lines obtained with the results of collision radiative modeling, the plasma electron temperature was found to be ∼3 eV.

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Section: Plasma Electron Densitymentioning

confidence: 93%

Spectroscopy of a ferroelectric plasma cathode

Dunaevsky

Chirko

Krasik

et al. 2001

Journal of Applied Physics

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“…The absorption coefficient for the probe beam (α 0 probe ) represents the density of atomic hydrogen at the n = 2 state [3]. In addition, since the widths of the peak components in the saturation spectrum are basically determined by the natural and the Stark broadenings, it would be possible to evaluate the electron density and the electron temperature of the plasma from the profiles of the peak components [11][12][13]. For example, in the case of the high-density mode discharge, the peaks were broadened due to Stark broadening and were overlapped each other as shown in figure 3 (but the peaks (1), ( 2), (6), and (7) were observable).…”

Section: Assignment Of Peaksmentioning

confidence: 99%

“…However, when we develop a system of saturation spectroscopy with the intention of applying it to plasma diagnostics, it is necessary to investigate its spectral characteristics as functions of plasma parameters. The shift and the broadening of fine-structure components of the hydrogen Balmer-α line were investigated by Weber and coworkers in unmagnified hollow cathode arc discharges approximately thirty years ago [11][12][13], where they used saturation-polarization spectroscopy to obtain a Doppler-free resolution. In this work, we examined characteristics of simple saturation spectroscopy in a magnetized linear plasma source.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of saturation spectroscopy at the Balmer-α line of atomic hydrogen in a linear magnetized plasma source

et al. 2012

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We adopted saturation spectroscopy for observing a Doppler-free spectrum of the Balmer-α line of atomic hydrogen in a linear magnetized plasma source. The spectrum was composed of a broadband offset and many peaks which were assigned as fine-structure components of the Balmer-α line with Zeeman splitting. We examined the amplitudes of the offset and line components as functions of the pump laser power and the discharge gas pressure. The saturation parameter or the amplitude of the saturation spectrum was discussed by referring to the theory of saturation spectroscopy. In addition, the physical origin of the broadband offset component was speculated on the basis of the pressure dependence of the saturation spectrum.

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“…This assumption is valid when the total line broadening is much wider than the separation between the fine structure components. At lower electron densities this problem is not easy to deal with because the fine structure splitting and the intensity of components might change with the electric plasma micro field [21][22][23]50]. Some preliminary calculations of Stark profiles on hydrogen lines with fine structure effect were done for the H α line in [51].…”

Section: Doppler-stark Coupling and Fine Structurementioning

confidence: 99%

“…The method has been successfully applied for many years under conditions of intermediate electron densities (10 20 ) when Doppler broadening might be the biggest broadening mechanism, the most suitable way to measure the Stark broadening is by means of Doppler free spectroscopy [21][22][23][24]. This very precise method is used to study the Stark effect under extremely low densities.…”

Section: Introductionmentioning

confidence: 99%

Hβ Stark broadening in cold plasmas with low electron densities calibrated with Thomson scattering

Palomares

Hübner

Carbone

et al. 2012

Spectrochimica Acta Part B: Atomic Spectroscopy

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In the present work Stark broadening measurements have been carried out on low electron density (n e b 5·10 19 m −3) and (relatively) low gas temperature (T g b 1100 K) argon-hydrogen plasma, under low-intermediate pressure conditions (3 mbar-40 mbar). A line fitting procedure is used to separate the effects of the different broadening mechanisms (e.g. Doppler and instrumental broadening) from the Stark broadening. A Stark broadening theory is extrapolated to lower electron density values, below its theoretical validity regime. Thomson scattering measurements are used to calibrate and validate the procedure. The results show an agreement within 20%, what validates the use of this Stark broadening method under such low density conditions. It is also found that Stark broadened profiles cannot be assumed to be purely Lorentzian. Such an assumption would lead to an underestimation of the electron density. This implies that independent information on the gas temperature is needed to find the correct values of n e .

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Nonlinear plasma spectroscopy of the hydrogen balmer-? line

Cited by 28 publications

References 17 publications

Spectroscopy of a ferroelectric plasma cathode

Spectroscopy of a ferroelectric plasma cathode

Characteristics of saturation spectroscopy at the Balmer-α line of atomic hydrogen in a linear magnetized plasma source

Hβ Stark broadening in cold plasmas with low electron densities calibrated with Thomson scattering

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