Continuum radiation from the mercury arc

Zollweg, R. J.; Liebermann, R. W.; Burnham, R. D.

doi:10.1016/0022-4073(77)90133-9

Cited by 13 publications

(6 citation statements)

References 15 publications

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“…Expressions ( 9) and ( 10) are in agreement with Zollweg et al [31]. Rutscher [7,10] reports for the bremsstrahlung crosssection,…”

Section: Electron-atom Collisionssupporting

confidence: 88%

Continuum radiation in a high pressure argon–mercury lamp

Burm¹

2004

Plasma Sources Sci. Technol.

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In typical high pressure high intensity discharge lamps about 60% of the deposited power is released in non-useful channels, non-radiative heat transfer from the hot arc core, ultraviolet radiation and infrared radiation, of which the last is the dominant one.To reduce the amount of infrared radiation emitted in high pressure argon-mercury lamps the sources of continuum radiation are identified, quantified and compared with results from emission spectroscopy. Objective data, especially for mercury, are lacking, which makes experimental verification necessary.Three possible continuum radiation sources were examined: electron-atom free-free bremsstrahlung, electron-ion free-free bremsstrahlung and electron-atom free-bound recombination radiation. The radiance caused by each of these processes can be calculated from test lamp fillings and the temperature profile in the lamp using a computer program. From comparing experimental results with computer calculations, the electron-mercury atom bremsstrahlung process has been determined as dominating the infrared radiation.

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“…Expressions ( 9) and ( 10) are in agreement with Zollweg et al [31]. Rutscher [7,10] reports for the bremsstrahlung crosssection,…”

Section: Electron-atom Collisionssupporting

confidence: 88%

Continuum radiation in a high pressure argon–mercury lamp

Burm¹

2004

Plasma Sources Sci. Technol.

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“…The 9859 cm −1 (1014 nm) line also has some advantages for temperature measurements. Zollweg et al (1977) used the optically thin Hg 492 and 577 nm lines for temperature measurements. These authors commented on the uncertainties of the transition probabilities of the 492 and 577 nm lines and the effect of the uncertainties on their study of continuum radiation from Hg HID lamps.…”

Section: Diagnostic Methods and Spectral Linesmentioning

confidence: 99%

“…A preliminary account of our research was presented by Koerber et al (2004) at the 10th International Symposium on the Science and Technology of Light Sources. Zollweg et al (1977) reported a significant experimental study of continuum radiation from high pressure Hg lamps. They concluded that their experimental results were in good agreement with calculations based on Geltman's (1973) approach in the IR at wavelengths >1000 nm, but were several times larger than the calculations in the visible.…”

Section: Introductionmentioning

confidence: 99%

Infrared continuum radiation from high and ultra-high pressure mercury lamps

Lawler¹,

Koerber²,

Weichmann³

2005

J. Phys. D: Appl. Phys.

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Infrared (IR) continuum radiation from the arc of high and ultra-high pressure (UHP) mercury lamps was measured and modelled. Three major contributions to the IR continuum are electron–atom bremsstrahlung, which is dominant, electron–ion bremsstrahlung and electron–ion recombination radiation. The line width of the resonance broadened Hg 71S0 to 61P1 transition at 1014 nm was used to determine the arc core Hg density, and the radiance of this line was used to determine the arc temperature as a function of radius. The temperature map for the UHP lamp was checked using the Bartels method on the 546 nm line of Hg. Model results based on recently published electron–atom bremsstrahlung coefficients were found to be in good agreement with measurements across the near IR.

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“…This review will not be summarized here, except to say that Johnston concludes that 'for most applications of astrophysical interest ' Dalgarno and Lane's (1966) approximation based on the momentum transfer cross section 'appears eminently suited'. Zollweg et al (1977) reported the most comprehensive experimental study of continuum radiation from HID lamps to date. They concluded that their experimental results were in good agreement with calculations based on Geltman's (1973) approach in the IR at wavelengths greater than 1000 nm, but were several times larger than the calculations in the visible at 500 nm.…”

Section: Introductionmentioning

confidence: 99%

Bremsstrahlung radiation from electron–atom collisions in high pressure mercury lamps

Lawler¹

2004

J. Phys. D: Appl. Phys.

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Bremsstrahlung coefficients for electron-mercury-atom collisions were computed using the corrected phase-shift approximation. These corrected bremsstrahlung coefficients are a weighted average of coefficients from the phase-shift and momentum transfer approximations. Phase-shifts determined from solutions of the Dirac-Fock scattering equations including both static and dynamic polarization potentials and exchange effects were used. The corrected coefficients approach the same limit at longer wavelengths as coefficients from the simpler momentum transfer approximation, but are generally larger.

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Continuum radiation from the mercury arc

Cited by 13 publications

References 15 publications

Continuum radiation in a high pressure argon–mercury lamp

Continuum radiation in a high pressure argon–mercury lamp

Infrared continuum radiation from high and ultra-high pressure mercury lamps

Bremsstrahlung radiation from electron–atom collisions in high pressure mercury lamps

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