He metastable concentration measurements in a glow discharge

Suh, M. H.; Hong, Xichun; Miller, Terry A.

doi:10.1016/s0301-0104(97)00364-9

Cited by 14 publications

(12 citation statements)

References 11 publications

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“…The 2 3 S atom densities on the plasma axis are estimated to be 8.0, 5.3, and 3.0 × 10 18 m −3 for Figs. 6(a)−(c), respectively, and the order of the densities is comparable to that obtained for discharge plasmas produced under similar experimental conditions [23][24][25]. The validity of the obtained τ 10 was qualitatively confirmed by observing the increase in τ 10 with the discharge current [31].…”

Section: A Radiative Transfer In the Cross Section Of A Cylindrical Psupporting

confidence: 78%

“…To clarify the roles that the metastable atoms play in these plasmas and to control the related engineering processes, it is necessary to evaluate their densities. As a diagnostic method for the 2 3 S atom density, self-absorption spectroscopy was adopted for a long time [22][23][24][25]. In this method, emission emanating from a plasma is reflected back into the plasma and the consequent absorption is observed.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of the helium 2³S metastable atom density by observation of the change in the 2³S–2³P emission line shape due to radiation reabsorption

Shikama¹,

Ogane²,

Iida³

et al. 2015

J. Phys. D: Appl. Phys.

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In helium discharge plasmas, the relative emission intensities of the fine-structure transitions belonging to the HeI 2 3 S−2 3 P transition can be affected by radiation reabsorption. Since the magnitude of the reabsorption depends on the density and temperature of the 2 3 S metastable atoms, their density can be determined by measuring the 2 3 S−2 3 P emission line shape using a high wavelength-resolution spectrometer. In this study, the applicable conditions of the method in terms of the opacity and line broadening are revealed, and possible causes of errors in the measurement, i.e., spatial distributions of the density and temperature and the effects of external magnetic and electric fields, are investigated. The effect of reabsorption under an external magnetic field is experimentally confirmed using a glow discharge plasma installed in a superconducting magnet.

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Section: A Radiative Transfer In the Cross Section Of A Cylindrical Psupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Measurement of the helium 2³S metastable atom density by observation of the change in the 2³S–2³P emission line shape due to radiation reabsorption

Shikama¹,

Ogane²,

Iida³

et al. 2015

J. Phys. D: Appl. Phys.

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“…All its known transitions [14] lie in the near UV range, which is not currently accessible to our experimental facility. Since NO behaves like a positively charged particle, the observed Doppler shifts cannot be due to momentum transferred in the electron-molecule collisions, as already reported for H 2 [5,6] and He [7,8]. Two hypotheses: electron-NO + recombination and momentum transfer in positive ion-molecule collisions, may be examined with more details.…”

Section: Introductionmentioning

confidence: 54%

“…Polarity-dependent lineshifts from neutrals in glow discharges have already been seldomly reported. They are restricted to Doppler shifts in the light molecules H 2 [5,6] or He [7,8] induced by momentum transferred from colliding electrons. Consequently the neutral behave like anions.…”

Section: Introductionmentioning

confidence: 99%

Cation-like Doppler shifts from a neutral molecule in an electrical discharge

Herbin

Farrenq

Guelachvili

et al. 2005

Chemical Physics Letters

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Velocity-modulation Fourier transform emission spectra from a N 2 O/He discharge plasma recorded between 1 and 5.5 µm are described. Surprisingly, they show Doppler-shifted lines for the E 2 Σ + -D 2 Σ + , C 2 Π-A 2 Σ + , and D 2 Σ + -A 2 Σ + Rydberg-Rydberg rovibronic transitions of the nitric oxide neutral molecule. These polarity-dependent Doppler-shifts are those of positively charged particles. Vibration-rotation lines of NO and transitions from other neutral molecules like N 2 are also present in the spectra with comparable intensities and remain unshifted. Experimental investigations and possible explanations are discussed.

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“…In order to quantify self-absorption, it is necessary to determine the self-absorbed radiation generated by the source and then compare this with the original radiation generation. Miller et al, 20 Giapis et al, 42 Suh et al, 43 and Alkemade 44 made use of some different techniques where the light emitted by a low-pressure argon plasma was re-directed towards the discharge by using a mirror. In some cases the reflected signal was modulated.…”

Section: Self-absorption Methods For Metastable Population Measurementmentioning

confidence: 99%

Population Measurement of the 3p⁵4s Configuration Levels in an Argon Microwave Plasma at Atmospheric Pressure

Santiago

Calzada

2007

Appl Spectrosc

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Metastable atoms, due to their intrinsic properties, are very useful to characterize plasma and to control the scientific and technological applications carried out with it. This paper describes the implementation of a method to determine the densities of the argon 3p(5)4s metastable and resonant levels in a microwave plasma at atmospheric pressure. Because the method is based on the self-absorption of the radiation emitted by the plasma, no external radiation source is needed. Using this method, the populations of the four levels of the 3p(5)4s argon configuration were found to be in the range 10(10)-10(12) cm(-3), in agreement with the values found in the literature.

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He metastable concentration measurements in a glow discharge

Cited by 14 publications

References 11 publications

Measurement of the helium 2³S metastable atom density by observation of the change in the 2³S–2³P emission line shape due to radiation reabsorption

Measurement of the helium 2³S metastable atom density by observation of the change in the 2³S–2³P emission line shape due to radiation reabsorption

Cation-like Doppler shifts from a neutral molecule in an electrical discharge

Population Measurement of the 3p⁵4s Configuration Levels in an Argon Microwave Plasma at Atmospheric Pressure

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He metastable concentration measurements in a glow discharge

Cited by 14 publications

References 11 publications

Measurement of the helium 23S metastable atom density by observation of the change in the 23S–23P emission line shape due to radiation reabsorption

Measurement of the helium 23S metastable atom density by observation of the change in the 23S–23P emission line shape due to radiation reabsorption

Cation-like Doppler shifts from a neutral molecule in an electrical discharge

Population Measurement of the 3p54s Configuration Levels in an Argon Microwave Plasma at Atmospheric Pressure

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Measurement of the helium 2³S metastable atom density by observation of the change in the 2³S–2³P emission line shape due to radiation reabsorption

Measurement of the helium 2³S metastable atom density by observation of the change in the 2³S–2³P emission line shape due to radiation reabsorption

Population Measurement of the 3p⁵4s Configuration Levels in an Argon Microwave Plasma at Atmospheric Pressure