D J Smith et al 2003 J. Phys. D: Appl. Phys. 36 1519 doi:10.1088/0022-3727/36/13/314
D J Smith1, G A Bonvallet and J E Lawler
Show affiliationsA study of the near-infrared (IR) emission from the arc of a metal-halide high intensity discharge (MH-HID) lamp with a sodium/scandium chemistry is reported. Radiometrically calibrated spectra from 0.7 to 2.5 μm were recorded as a function of position on the arc tube of a 250 W lamp. These spectra were analysed to determine the relative densities of Na and Sc atoms and the arc temperature as a function of radius. Information from these spectra, combined with absorption measurements in the companion paper (Bonvallet and Lawler 2003), were used to determine the absolute output power in the near-IR from the MH-HID lamp.
52.80.Mg Arcs; sparks; lightning; atmospheric electricity
82.33.Xj Plasma reactions (including flowing afterglow and electric discharges)
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
Issue 13 (7 July 2003)
Received 21 February 2002
Published 18 June 2003
D J Smith et al 2003 J. Phys. D: Appl. Phys. 36 1519
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