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

Lawler, J. E.

doi:10.1088/0022-3727/37/11/004

Cited by 10 publications

(14 citation statements)

References 17 publications

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“…That is based on the observation that Q BS is only a weakly varying function of the energy [18]. We refer to [12,13,15,16,18,19] for more details of the derivations. We will follow the latter approach of elastic collisions, that will enable us to have an energy independent cross section based on the momentum transfer cross section.…”

Section: Absolute Continuum Methodsmentioning

confidence: 99%

“…However, at a wavelength of 580 nm the electron-ion interactions contribute with a fraction of about 24% to the continuum, so that in contrast to the study of Iordanova et al [16] the electron-ion interactions cannot be neglected. Using formule (11) and (12) we get the following expression for the electron density:…”

Section: Absolute Continuum Methodsmentioning

confidence: 99%

“…For this purpose the absolute continuum intensity (ACI) method was used. For an overview and the basic assumptions of this technique see [11][12][13][14][15][16]. The amount of continuous light radiating from a certain volume can be related to bremsstrahlung.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigating a coaxial linear microwave discharge

Hübner¹,

Wolthuis²,

Palomares³

et al. 2011

J. Phys. D: Appl. Phys.

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Section: Absolute Continuum Methodsmentioning

confidence: 99%

Section: Absolute Continuum Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Investigating a coaxial linear microwave discharge

Hübner¹,

Wolthuis²,

Palomares³

et al. 2011

J. Phys. D: Appl. Phys.

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“…On the other hand, despite relatively large electron densities, high intensity discharge (HID) lamps will have dominant ea collisions due to the high neutral particles densities [21]. This effect will be even more pronounced in the case of an Ar/Hg lamp because of the large ν Hg ea cross section [22,23]. Thermal arcs on the other side [4], are in Saha equilibrium and ei collisions are dominant.…”

Section: Jinst 7 C01016mentioning

confidence: 99%

Revision of the criterion to avoid electron heating during laser aided plasma diagnostics (LAPD)

et al. 2012

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A criterion is given for the laser fluency (in J/m 2 ) such that, when satisfied, disturbance of the plasma by the laser is avoided. This criterion accounts for laser heating of the electron gas intermediated by electron-ion (ei) and electron-atom (ea) interactions. The first heating mechanism is well known and was extensively dealt with in the past. The second is often overlooked but of importance for plasmas of low degree of ionization. It is especially important for cold atmospheric plasmas, plasmas that nowadays stand in the focus of attention. The new criterion, based on the concerted action of both ei and ea interactions is validated by Thomson scattering experiments performed on four different plasmas.

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“…The choice of electron-Hg atom bremsstrahlung coefficients is crucial for a realistic simulation of the near IR continuum since this bremsstrahlung process is dominant. This study employs electron-Hg atom bremsstrahlung coefficients computed by Lawler [8] using corrected phaseshift approximation [9][10][11]. The bremsstrahlung coefficients from the corrected phase-shift approximation are somewhat larger than coefficients from simpler approximations used in older work.…”

Section: Introductionmentioning

confidence: 99%

Infrared continuum radiation from metal halide high intensity discharge lamps

Herd¹,

Lawler²

2007

J. Phys. D: Appl. Phys.

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Infrared (IR) continuum radiation from the arc of a metal halide high intensity discharge lamp was measured and modelled. There are three contributions to the near IR continuum from free electrons: electron–Hg atom bremsstrahlung, electron–ion bremsstrahlung and electron–ion recombination radiation. Electron–Hg atom bremsstrahlung is the most important of these. The radiation transport model utilized empirical Hg density, arc temperature and electron density maps. The line width of the Hg 71S0 to 61P1 resonance broadened transition was used to determine the arc core Hg density. The arc temperature as a function of radius was determined using the radiance of the Hg 9860, 7311 and 7166 cm−1 lines. Relative densities of neutral Dy atoms and Dy ions as a function of radius were found using an Abel inversion of the relative line radiance of selected Dy I and Dy II lines. A Saha analysis was used to determine the electron density in the lamp. The continuum is 73% of the total near IR radiation in the 4000–12 800 cm−1 range.

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

Cited by 10 publications

References 17 publications

Investigating a coaxial linear microwave discharge

Investigating a coaxial linear microwave discharge

Revision of the criterion to avoid electron heating during laser aided plasma diagnostics (LAPD)

Infrared continuum radiation from metal halide high intensity discharge lamps

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