The determination of the neutral atom density in a high-pressure mercury discharge from the 253.7 nm self-reversed resonance line

Elloumi, Hatem; Aubès, M.; Simonet, F.; Damelincourt, J. J.

doi:10.1088/0022-3727/30/13/010

Cited by 9 publications

(11 citation statements)

References 12 publications

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“…This value has been verified experimentally for several Hg discharges with different operating pressures. 5,7 The optical thickness along a line of sight of plasma delimited between Ϫx 0 and x 0 , at the maximum intensity of the red wing may be expressed as…”

Section: B ⌬ R Methods For Ground State Measurementsmentioning

confidence: 99%

“…Both methods, developed in detail elsewhere, 5,6 are spatially resolved in the radial direction and exempted of any LTE assumption. So, the ⌬ R method allows the determination of the ground state density in highpressure mercury discharge from the broadening of the red wing of the Hg-253.7 nm self-reversed resonance line.…”

Section: Experimental Investigation Of Deviations From Local Thermodymentioning

confidence: 99%

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Experimental investigation of deviations from local thermodynamic equilibrium in high-pressure mercury discharges

Elloumi

Kindel²,

Schimke³

et al. 1999

Journal of Applied Physics

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The determination of the radial profile of the ground state density without assuming local thermodynamic equilibrium (LTE) conditions in around atmospheric pressure (0.01 MPa<p<0.3 MPa) discharges used as light sources is a worthy investigation subject. This work deals with the high-pressure mercury discharge which could be considered as a “test case.” Particularly useful for the diagnostics of these plasmas is the self-reversed resonance mercury line 253.7 nm. In this article, two independent experimental methods were used: emission spectroscopy, called the “ΔλR method,” and interference shift measurements “hook method.” Using the Hg-253.7 nm resonance line, both experimental methods indicate similar deviations from LTE in particular for the lower pressure discharges (p<0.04 MPa). In those cases, the experimental errors for both methods are significantly lower than the detected deviations. Furthermore, the measured deviations are in good agreement with predicted values from a two-temperature, two-dimensional fluid model developed elsewhere.

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Section: B ⌬ R Methods For Ground State Measurementsmentioning

confidence: 99%

Section: Experimental Investigation Of Deviations From Local Thermodymentioning

confidence: 99%

Experimental investigation of deviations from local thermodynamic equilibrium in high-pressure mercury discharges

Elloumi

Kindel²,

Schimke³

et al. 1999

Journal of Applied Physics

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show abstract

“…The range of M values between 0 and 1 includes all possible distributions of the relative source function on the optical scale for the manifold of high-pressure discharges. The general validity or the range of applicability of relation (30) between M and the inhomogeneity parameter α have to be proven. In [7], the accuracy of K, cf (28), at the reversal maxima has been tested in numerical experiments for a variety of temperature distributions as well as for certain deviations from LTE.…”

Section: Cowan-dieke-karabourniotis Approachmentioning

confidence: 99%

“…In [26,27] the axis temperature of high-pressure sodium lamps was related to the reversal maxima of the Na D lines by radiation transport calculations. With selfreversed lines, especially resonance lines, partial pressures were also determined as in [28][29][30][31][32]. The so-called λ method was mainly applied which relates the distance λ of the reversal maxima to the partial pressures of the emitting and broadening plasma components in a parametrized form.…”

Section: Introductionmentioning

confidence: 99%

Basic concepts of temperature determination from self-reversed spectral lines

Schneidenbach¹,

Franke²

2008

J. Phys. D: Appl. Phys.

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Complex high-pressure plasmas have become increasingly important in technical applications such as high-intensity discharge lamps. The knowledge of temperature distributions is of basic interest for the understanding of the physical mechanisms in these plasmas and for a selective manipulation of their properties. It is shown that self-reversed spectral lines provide a powerful diagnostic tool for temperature determination. The two most important approaches for the corresponding data analysis are reviewed and their limitations are discussed. On the basis of these approaches a new method is proposed which avoids the main limitations especially in the application to resonance lines. The temperature has been determined in a Hg/Ar and a Hg/Ar/TlI high-pressure discharge. Measured spectral radiances of the Hg 546.1 and 253.7 nm as well as Tl 377.6 nm lines are analysed and the potentials of the different methods are demonstrated.

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“…Even though Stormberg noted that his approach lacks a physical justification it is often used in HID modelling, e.g. [6][7][8][9], because it can successfully reproduce measured spectra. However, in order to achieve agreement with experimental spectra, quasi-static and Lorentz part of the van der Waals line profile have to be used with separate C 6 constants that may differ considerably [8].…”

Section: Introductionmentioning

confidence: 99%

Broadening constants of mercury lines as determined from experimental side-on spectra

Wendt¹,

Franke

2008

J. Phys. D: Appl. Phys.

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Using the line profiles of Al-Saqabi and Peach we determined van der Waals and Stark broadening constants of the neutral mercury lines at 546.1, 435.8, 404.7 and 365.0 nm when perturbed by mercury. The line profiles employed show a continuous transition from the impact to the quasi-static limit of the line broadening theory so that the derived van der Waals broadening constants are valid for both low and high mercury densities. The broadening constants were determined by χ2-minimization of absolutely calibrated spectra measured on a 150 W type high intensity discharge lamp filled with mercury and argon. Particle densities were calculated assuming local thermodynamic equilibrium. Using spectra from four side-on positions and treating the temperatures at corresponding radii as fit parameters, the resulting best fit axis temperatures and pressures lie within the uncertainties of axis temperatures determined by the Bartels method and within the uncertainties of pressures determined by Abel inversion of the optically thin mercury lines at 577.0 and 579.1 nm. Best fit axis temperatures and pressures have line-to-line differences of only 6% and 1%, respectively.

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The determination of the neutral atom density in a high-pressure mercury discharge from the 253.7 nm self-reversed resonance line

Cited by 9 publications

References 12 publications

Experimental investigation of deviations from local thermodynamic equilibrium in high-pressure mercury discharges

Experimental investigation of deviations from local thermodynamic equilibrium in high-pressure mercury discharges

Basic concepts of temperature determination from self-reversed spectral lines

Broadening constants of mercury lines as determined from experimental side-on spectra

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