| 摘要 |
1476299 Atomic fluorescence spectroscopy NATIONAL RESEARCH DEVELOPMENT CORP 3 Oct 1974 [26 Oct 1973] 49969/73 Heading G1A In a non-dispersive atomic fluorescence spectroscopy apparatus the sample to be analyzed is placed in a notch 2 of a carbon filament atom reservoir 1 which is heated so that its temperature increases at a steady rate. The filaments electrodes 4 and 5 are supplied from the mains via a variable transformer 20 and a further transformer 21. As the filament heats up different atoms vapourize selectively at different temperatures. The resulting "cloud" is irradiated via cassegrain mirror systems 8 and 9 by two electrodeless discharge lamps 6 and 7 supplied from a micro-wave generator 24. The wavelength of the radiation from the two lamps is such that each excites fluorescence in at least one of the various atomic constituents being investigated. The resulting fluorescence is viewed via a further cassegrain mirror system 10 by a photo-multiplier 11. An oscilloscope 12 provides signal amplificated and read-out. Thus by observing the oscilloscope for "peaks" the presence of particular elements can be determined by the timing of their appearance. |
