Branching ratio technique for vacuum UV radiance calibrations: Extensions and a comprehensive data set

Klose, Jules Z.; Wiese, Wolfgang L.

doi:10.1016/0022-4073(89)90001-0

Cited by 36 publications

(15 citation statements)

References 30 publications

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“…deuterium lamps, is poor especially close to the cut off wavelength of the magnesium fluoride window (120-160 nm). Another method for absolute calibration is to use the branching ratio technique [13]. The method utilizes a branching pair of spectral lines emitted in transitions from a common excited state in the plasma.…”

Section: Plasma Vuv-irradiance Measurementmentioning

confidence: 99%

VUV irradiance measurement of a 2.45 GHz microwave-driven hydrogen discharge

Komppula

Tarvainen

Kalvas

et al. 2015

J. Phys. D: Appl. Phys.

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Absolute values of VUV-emission of a 2.45 GHz microwave-driven hydrogen discharge are reported. The measurements were performed with a robust and straightforward method based on a photodiode and optical filters. It was found that the volumetric photon emission rate in the VUV-range (80-250 nm) is 10 16 -10 17 1/cm 3 s, which corresponds to approximately 8% dissipation of injected microwave power by VUV photon emission. The volumetric emission of characteristic emission bands was utilized to diagnostics of molecular plasma processes including volumetric rates of ionization, dissociation and excitation to high vibrational levels and metastable states. The estimated reaction rates imply that each injected molecule experiences several inelastic electron impact collisions. The upper limit for the total density of metastable neutrals (2S atoms and c 3 Π u molecules) was estimated to be approximately 0.5% of the neutral gas density.

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Section: Plasma Vuv-irradiance Measurementmentioning

confidence: 99%

VUV irradiance measurement of a 2.45 GHz microwave-driven hydrogen discharge

Komppula

Tarvainen

Kalvas

et al. 2015

J. Phys. D: Appl. Phys.

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“…This in turn suggests that the analysis could be well suited for application to common-upper-state pairs of lines of very different wavelengths whose branching ratios are increasingly used for calibration of laboratory spectrometers (cf. Klose & Wiese 1989). In such cases one line may be a resonance line, with lower level or term in the ground configuration, and the other line a subordinate line with its lower level being an excited level of much lower population.…”

Section: Sensitivity Constraints: Laboratory Applicationsmentioning

confidence: 99%

An intensity/linewidth analysis of opacity: first applications to a solar prominence and He II line profiles

Kastner¹,

Bhatia

1998

Monthly Notices of the Royal Astronomical Society

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An analysis is described which can derive optical thicknesses and associated quantities from measured intensities and linewidths using convenient expressions for photon escape probabilities and for opacity‐broadened line halfwidths. An associated analysis of the effect of observational errors is provided. The analysis treats intensities and linewidths independently so that internal consistency of results can provide a measure of observational accuracy, which is shown here to be a stringent requirement. As examples, first applications are made to Si II lines in a solar prominence and to some high‐resolution observations of the solar He II 303.78‐Å resonance line.

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“…The electron density is approximately equal for the two series, while the electron temperature reaches 100 eV for the 50 kA series, and 200 eV for the 80 kA series. For the experiments, we use a V W spectrometer (Fonck et QE 1982, Brzozowski et ~l 1991) which has been absolutely calibrated using the branching ratio technique (Klose and Wiese 1989). One of the branching ratios that has been used is the OSt 3 p 2 P -+ 2szS to 0" 3 p 2 P -+ 3s zS line ratio.…”

Section: Application To Extrap-ti Wp Datamentioning

confidence: 99%

An elegant method to estimate helium-like ion densities from visible and VUV plasma spectroscopy

Zastrow¹,

Brzozowski²,

Hörling³

et al. 1993

Plasma Phys. Control. Fusion

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A method is presented to estimate the densities of He-like carbon and oxygen ions from the observation of the Li-like 3p + 3s transitions inthe visible and the 3p + 2s transitions in the vacuum ulbaviolet The method is based on a zerodimensional model for plasmas with short particle confinement times. General coefficients for this study are derived and evaluated numerically. The method is applied to Extrap-T1 reversed field pinch dat

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Branching ratio technique for vacuum UV radiance calibrations: Extensions and a comprehensive data set

Cited by 36 publications

References 30 publications

VUV irradiance measurement of a 2.45 GHz microwave-driven hydrogen discharge

VUV irradiance measurement of a 2.45 GHz microwave-driven hydrogen discharge

An intensity/linewidth analysis of opacity: first applications to a solar prominence and He II line profiles

An elegant method to estimate helium-like ion densities from visible and VUV plasma spectroscopy

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