Measurements of broadening of argon lines and oscillator strengths of resonance lines

Vallée, Olivier; Ranson, P.; Chapelle, J.

doi:10.1016/0022-4073(77)90063-2

Cited by 31 publications

(16 citation statements)

References 16 publications

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“…The method is somewhat uncertain, however, because the reported collisional broadening parameters, C c have rather large discrepancies. Vallee et al reported C c = 1.51 × 10 −37 m 4 K −0.3 at T = 3900 K [38]. In our previous work [32], the measured value was C c = 2.54 × 10 −37 m 4 K −0.3 at T = 340 K. In this work, the reported gas temperature by laser diode absorption was comparable to the OH rotational temperature if the value of Vallee et al was used.…”

Section: Ar(1s 5 ) Absorptionmentioning

confidence: 99%

Instability control in microwave-frequency microplasma

Miura

Hopwood

2012

Eur. Phys. J. D

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Abstract. Atmospheric argon microplasmas driven by 1.0 GHz power were studied by microwave circuit analyses and spatially-resolved optical diagnostics. These studies illuminate the mechanisms responsible for microplasma stability. A split-ring resonator (SRR) microplasma source is demonstrated to reflect excess microwave power, preventing the ionization overheating instability while limiting electron density to approximately 1 × 10 14 cm −3 and OH rotational temperature to 760 K at 0.76 W. Providing the SRR microplasma with an electrical path to ground, however, allows the microplasma to transition from the SRR mode to the so-called transmission line mode (T-line). This transition is due to matching of the microplasma and transmission line impedances. The higher power T-line mode supports a more intense microplasma with electron density of 1 × 10 15 cm −3 and OH rotational temperature of 1480 K with 15 W absorbed power. While the SRR mode is optimized for ignition and sustaining a stable nonequilibrium plasma, and T-line mode is better suited for driving a hot, high density microplasma. The estimated microwave discharge voltages were 15 V and 35 V in SRR mode and T-line mode, respectively, and the voltages are rather independent of input power. Microplasma stability is due to a combination of impedance mismatching and direct control of power, both inherent to microwave circuitry.

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Section: Ar(1s 5 ) Absorptionmentioning

confidence: 99%

Instability control in microwave-frequency microplasma

Miura

Hopwood

2012

Eur. Phys. J. D

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“…However, if conventional RPA correction (Eq.1) is included, the difference is also large, though of an opposite sign. And only 1 # Reference Year f 1s4 f 1s2 1 Lewis [13] 1967 0.063±0.003 0.278±0.020 2 Lawrence [14] 1968 0.059±0.003 0.228±0.021 3 Geiger [15] 1970 0.047±0.009 0.186±0.037 4 de Jongh and Eck [16] 1971 0.22±0.02 5 Irwin et al [17] 1973 0.083±0.027 0.35±0.13 6 McConkey and Donaldson [18] 1973 0.096±0.002 7 Copley and Camm [19] 1974 0.076±0.008 0.283±0.024 8 Vallee et al [20] 1977 0.051±0.007 0.210±0.030 9 Westerveld et al [21] 1979 0.063±0.005 0.240±0.020 10 Hahn and Schwentner [22] 1980 0.077±0.004 0.361±0.060 11 Chornay et al [23] 1984 0.065±0.005 12 Li et al [24] 1988 0.058 IV is denoted by letters in accordance with the NIST convention: for example, the accuracy of class "C" is about 10%. Still in the case of the p −1 3/2 4s-p −1 3/2 4p transition the disagreement is quite large and independent of RPA corrections which might indicate that the problem is in the experiment.…”

Section: Argon Transitions Between Excited Statesmentioning

confidence: 99%

Theoretical energies and transition probabilities of argon

Savukov¹

2003

J. Phys. B: At. Mol. Opt. Phys.

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“…[28 -31]. Several alternative experimental methods that have avoided the line-saturation problem have been employed to determine discrete optical oscillator strengths of argon, such as self-absorption [16,23,27], lifetime [12,14,17,24], pressure-broadening profile [13,19,20], and electron-impact-based methods [1,15,18,21,22,25,26]. It should be mentioned that these techniques are somewhat complex and are often severely restricted in their range of application except for the electron-impact-based methods.…”

Section: Introductionmentioning

confidence: 99%

Electron-impact study in valence and autoionization resonance regions of argon

Zhong

Feng

et al. 1995

Phys. Rev. A

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The recently built electron-energy-loss spectrometer (EELS) (typical FWHM 60 meV) was employed to measure the EELS spectra of argon in the discrete and autoionization resonance regions at a 2.5-keV impact energy and a mean scattering angle of O'. Relative differential optical oscillator strength spectra were established by multiplying the EELS spectra by the known Bethe-Born conversion factor of the spectrometer, and were normalized at a single point in the smooth continuum using the absolute values reported by Chan et al. [Phys. Rev. A 46, 149 (1992)]. The absolute oscillator strengths corresponding to these energy regions are reported and compared with previously published experimental and theoretical values. The values of parameters q, p, E", and I for autoionization resonances involving states 3s3p np 'P, (n =4, 5, and 6) have been determined.

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Measurements of broadening of argon lines and oscillator strengths of resonance lines

Cited by 31 publications

References 16 publications

Instability control in microwave-frequency microplasma

Instability control in microwave-frequency microplasma

Theoretical energies and transition probabilities of argon

Electron-impact study in valence and autoionization resonance regions of argon

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