On dense hydrogen and noble gases plasma spectra

Vitel, Y.; Bezzari, M. El; Gavrilova, T. V.; Skowronek, M.; D’yachkov, L. G.; Kurilenkov, Yu. K.

doi:10.1016/s0921-4526(96)00364-x

Cited by 7 publications

(7 citation statements)

References 8 publications

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“…First of all, the extreme density lowers the ionization energy threshold and thus 'erases' the upper energy levels of atoms. This results in the absence of the H β and H γ lines, for example, along with an increase in continuum radiation [20,25]. These effects can only occur in non-ideal plasmas and can clearly be observed on our spectra, as mentioned earlier.…”

Section: Non-ideality Of the Plasmasupporting

confidence: 72%

“…We hardly distinguish on figure 7(c) the H α line, two oxygen lines and two copper lines. Such extreme densities destroy the upper energy levels of the atoms, and the free-bound radiation becomes more important than line radiation [24,25]. As discussed in section 3.3, this is spectroscopic evidence that the plasma created during the earliest time of an EDM discharge is a non-ideal plasma.…”

Section: Time-integrated Emission Spectramentioning

confidence: 93%

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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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Section: Non-ideality Of the Plasmasupporting

confidence: 72%

Section: Time-integrated Emission Spectramentioning

confidence: 93%

Optical emission spectroscopy of electrical discharge machining plasma

Descoeudres¹,

Hollenstein²,

Demellayer³

et al. 2004

J. Phys. D: Appl. Phys.

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show abstract

“…This results in absence of the H ␤ and H ␥ lines, for example, along with an increase in continuum radiation [11,15]. These effects can only occur in non-ideal plasma and can clearly be observed on our spectra as said previously.…”

Section: Non-ideality Of the Plasmasupporting

confidence: 64%

“…5(c) the H ␣ line, two oxygen lines and two copper lines. Such extreme densities destroy the upper energy levels of the atoms, and the free-bound radiation becomes more important than line radiation [15]. As discussed in Section 3.3, this is spectroscopic evidence that the plasma created during the earliest time of an EDM discharge is a non-ideal plasma.…”

Section: Time-integrated Emission Spectramentioning

confidence: 94%

Optical emission spectroscopy of electrical discharge machining plasma

Descoeudres¹,

Hollenstein²,

Demellayer³

et al. 2004

Journal of Materials Processing Technology

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“…Specially, the present results can play useful role to improve our understanding about the evolution of stellar environments. We believe that our present results will encourage further studies in the experiments with the non‐ideal helium plasmas produced in flashlamps [44], helium atmospheric pressure plasma jet [45], penning plasma discharge [46], and so forth.…”

Section: Discussionmentioning

confidence: 83%

Stability of the helium atom embedded in classical nonideal plasmas

Das

Ghoshal

2021

Int J of Quantum Chemistry

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Properties of the ground state of the helium atom embedded in classical nonideal plasmas have been investigated within the framework of variational method. The background plasma is described by a pseudopotential which has been deduced from the sequential solution of Bogolyubov's hierarchy equations. An extensive trial wave function is employed in Rayleigh-Ritz variational principle to compute various quantities associated with the ground state of helium atom quite accurately. A detailed study is made on the changes in those quantities introduced by the varying nonideality of the plasma in a wide range. In particular, special emphasis is made to study the stability of the atom in the plasma by computing the critical values of screening parameter and nonideal parameter accurately. To the best of our knowledge, such a study on the stability of helium atom in classical nonideal plasmas is reported for the first time in the literature.

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On dense hydrogen and noble gases plasma spectra

Cited by 7 publications

References 8 publications

Optical emission spectroscopy of electrical discharge machining plasma

Optical emission spectroscopy of electrical discharge machining plasma

Optical emission spectroscopy of electrical discharge machining plasma

Stability of the helium atom embedded in classical nonideal plasmas

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