Deuterium arc lamps

Deuterium arc background correction. This system uses two lamps, a high-intensity deuterium arc lamp producing an emission continuum over a wide wavelength range and the hollow cathode lamp of the element to be determined. 

Instrumentation. A Varian Model 63 atomic absorption spectrophotometer, equipped with a graphite atomizer head was used to analyze all samples. Instrument parameters appear in Table I. A tin, hollow cathode lamp was used to generate the desired wavelength. A deuterium arc lamp was used to correct for non-atomic absorption signals. 

A deuterium arc lamp has two electrodes, bathed in an atmosphere of deuterium, between which a metallic screen pierced with a hole of 1 mm in diameter is placed. The discharge current creates an intense arc at the level of this hole, which is close to the anode. Under electron bombardment, deuterium molecules dissociate, emitting a continuum of photons over the range of 160 to 400 nm (Fig. 11.9). 

Dead time, 7 Dead volume, 13 DEAE cellulose, 88 Deconvolution (spectrum), 215 Deflection equation, 297 Degrees of freedom, 168 Derivative spectrometry 215 Deshielding, 139 Deuterium arc lamp, 199 Diffuse peak, 324 Diffuse reflection, 180 Diffusion coefficient, 5, 102 Diffusion current, 362 Diode array, 200 Distribution isotherm, 9 Double beam, 169 DTGS, 175... 

Figure 20-3 Intensity of a tungsten filament at 3 200 K and a deuterium arc lamp.

Figure 4.2. Intensity distribution over the spectral range used in AAS for (a) the xenon short-arc lamp used for HR-CS AAS (XBO 301, 300 W, GLE, Berlin, Germany), compared to (b) a conventional xenon arc lamp (L 2479, 300 W, Hamamatsu, Japan) and (c) a deuterium arc lamp (MDO 620, 30 W, Heraeus, Germany).

Apparatus Use a suitable spectrophotometer (Perkin-El-mer Model 6000, or equivalent), a graphite furnace containing a L vov platform (Perkin-Elmer Model HGA-500, or equivalent), and an autosampler (Perkin-Elmer Model AS-40, or equivalent). Use a lead hollow-cathode lamp (lamp current of 10 mA), a slit width of 0.7 mm (set low), the wavelength set at 283.3 nm, and a deuterium arc lamp for background correction. 

Background correction is carried out with a continuum source, e.g. a hydrogen hollow-cathode lamp or a deuterium-arc lamp. 

To measure the background irradiance of the ICP in the 180-440 nm region, a precalibrated deuterium arc lamp was used. The... 

Figure 5.15 Emission spectrum of a commercial deuterium arc lamp. [Courtesy of Agilent Technologies (www.agilent.com).]...

Figure 77 Emission spectra of (A) xenon-mercury arc lamp, (B) deuterium arc lamp, and (C) deuterium hollow cathode lamp. (Adapted from M. S. Epstein and T. C. Rains, Anal. Chem., 1976, 48, 528)...

The spectrometer can be equipped for quasi-simultaneous measurement of the line and background absorption [159]. Radiation from a second, continuous source, such as a deuterium arc lamp, is rapidly switched with the radiation of the primary source and fed through the ab.sorption volume, by a semitransparent mirror. The radiant flux of the continuous source is not decreased significantly by atomic absorption, owing to the low spectral resolution of the monochromator however, it will be weakened by broad-band absorption of molecules, or stray radiation. By this means, nonelement-specific background absorption can... 

In absorption spectroscopy, the sample is illuminated by a light with wavelengths in the ultra-violet/visible range by a source such as a tungsten filament, a deuterium arc lamp or light-emitting diodes. A diffraction... 

The deuterium arc lamp presents a good continuity and intensity in the ultraviolet region, and a low noise level, but a poor continuity, in the visible range (Fig. 3.6). The intensity of the emitted light of these lamps decreases constantly in time and generally it becomes half of the initial one in circa 1,000 h. 

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