Calculations and Measurements of the Dynamic Stark Effect in Hydrogen

Rutgers, W.R.; Kalfsbeek, H. W.

doi:10.1515/zna-1975-6-705

Cited by 17 publications

(5 citation statements)

References 6 publications

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“…As a consequence, depressions or 'dips' will appear on the spectrum. These complex phenomena are described by several authors [51][52][53][54][55][56][57][58][59]. The addition of these effects, typical in non-ideal plasma, results in multiple modifications in the H α profile, as observed in our measurements.…”

Section: Non-ideality Of the Edm Plasmasupporting

confidence: 74%

Time- and spatially-resolved characterization of electrical discharge machining plasma

Descoeudres

Hollenstein

Wälder³

et al. 2008

Plasma Sources Sci. Technol.

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Plasma created during electrical discharge machining (EDM) is investigated with fast imaging and with time-and spatially-resolved optical emission spectroscopy. After the breakdown, the plasma develops very fast (< 50ns) and then remains stable. The plasma excites a broad volume around the electrode gap. Typical spectra show a strong H α and continuum radiation, with many lines emitted by impurities coming from electrodes materials. The plasma contamination from the electrodes is mostly concentrated in their vicinity. The electron density reaches 2·10 18 cm -3 at the beginning of the discharge. This extreme density causes merging of lines, strong Stark broadening and shift of the H α line. The density decreases afterwards rapidly with time. The electron temperature remains roughly constant around 0.7eV. The low temperature, the high density measured and other spectroscopic evidences prove that the EDM plasma is non-ideal (Γ ≅ 0.45).

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Section: Non-ideality Of the Edm Plasmasupporting

confidence: 74%

Time- and spatially-resolved characterization of electrical discharge machining plasma

Descoeudres

Hollenstein

Wälder³

et al. 2008

Plasma Sources Sci. Technol.

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“…Finally, if resonant interactions between the Stark separation and the oscillations of the dynamic field occur, depressions or 'dips' appear on the spectrum. These complex phenomena are described by several authors [39][40][41][42][43][44][45][46][47]. The addition of these effects, typical in non-ideal plasmas, results in multiple modifications in the H α profile, as seen in figure 12.…”

Section: Non-ideality Of the Plasmamentioning

confidence: 96%

Optical emission spectroscopy of electrical discharge machining plasma

Descoeudres¹,

Hollenstein²,

Demellayer³

et al. 2004

J. Phys. D: Appl. Phys.

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Plasma created during electrical discharge machining is systematically investigated using optical emission spectroscopy. Typical spectra show a strong Hα and continuum radiation, with many lines emitted by impurities coming from electrode and workpiece materials. The dielectric molecules are cracked by the discharge. Changing polarity affects the electrode wear and workpiece erosion rates, which can be qualitatively seen on the spectra. Time-resolved spectroscopy shows that the plasma density reaches 2 × 1018 cm−3 at the beginning of the discharge. This extreme density causes the merging of lines, strong Stark broadening and shift of the Hα line. Afterwards, the density decreases rapidly with time. The electron temperature remains roughly constant around 0.7 eV. The low temperature and the high density measured prove that the EDM plasma is non-ideal (Γ ≃ 0.45). Absence of the Hβ line, asymmetric shape of the Hα line and complex structures around Hα are other spectroscopic evidences of the plasma non-ideality.

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“…Finally, if resonant interactions between the Stark separation and the oscillations of the dynamic field occur, depressions or "dips" appear on the spectrum. The addition of these effects, typical in non-ideal plasma, results in multiple modifications in the H ␣ profile [23]. The complexity of the emission spectrum reflects the complexity of the plasma itself: it is a cold and dense plasma, highly collisional, with strong electric field, turbulence and resonance phenomena.…”

Section: Non-ideality Of the Plasmamentioning

confidence: 99%