Xenon resonance lamp

Fig. 3. Comparison of emission of a xenon resonance lamp with getter (-) and...

Fig. 41. Xenon resonance lamp in a photolysis system. From ref. 139.

See high-pressure, medium-pressure, and low-pressure mercury lamp (arc), and antimony-xenon, mercury-xenon, quartz-iodine, tungsten-halogen, resonance, and xenon lamp. 

In this review of the high pressure sodium lamp, emphasis is placed on evidence concerning the interaction of resonantly excited sodium atoms with sodium, mercury or xenon atoms, which modifies the spectral radiance of lamps to improve the color or efficacy. The influence of mercury and xenon buffer gases on tne thermal and electrical conductivities and hence on lamp efficacy are also indicated. 

Coherent forward scattering (CFS) atomic spectrometry is a multielement method. The instrumentation required is simple and consists of the same components as a Zeeman AAS system. As the spectra contain only some resonance lines, a spectrometer with just a low spectral resolution is required. The detection limits depend considerably on the primary source and on the atom reservoir used. When using a xenon lamp as the primary source, multielement determinations can be performed but the power of detection will be low as the spectral radiances are low as compared with those of a hollow cathode lamp. By using high-intensity laser sources the intensities of the signals and accordingly the power of detection can be considerably improved. Indeed, both Ip(k) and Iy(k) are proportional to Io(k). When furnaces are used as the atomizers typical detection limits in the case of a xenon arc are Cd 4, Pb 0.9, T11.5, Fe 2.5 and Zn 50 ng [309]. They are considerably higher than in furnace AAS. 

In atomic fluorescence spectrometry (AFS), the analyte is introduced into an atomizer (flame, plasma, glow discharge, furnace) and excited by monochromatic radiation emitted by a primary source. The latter can be a continuous source (xenon lamp) or a line source (hollow cathode lamp, electrodeless discharge lamp, or tuned laser). Subsequently, the fluorescence radiation, which may be of the same wavelength (resonance fluorescence) or of longer wavelength (nonresonance fluorescence), is measured. 

Resonance Imaging (ESRI) technique. The shape of eoneentration profiles of the nitroxides accumulated in the equilibrium state upon filtered Xenon lamp-equipped Weather-Ometer exposure was interpreted in terms of the oxygen diffusion limited oxidation and radiation penetration in oxidation-stressed polymer surfaces. The data indicate differences in the character of the heterogeneous process in dependence on the polymer matrix and on the used stabilizer system based on secondary HAS and 0-alkylhydroxylamine HAS and/or HAS combination with UV absorbers. Imaging of nitroxides is a precise tool for marking heterogeneous oxidation of polyolefins. 

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