Method and apparatus for atomic absorptions - or atom fluorescence - spectral analysis

摘要

1,221,172. Atomic resonance NATIONAL RESEARCH DEVELOPMENT CORP. 14 Jan., 1970 [16 Jan., 1969], No. 2590/69. Heading G6P. In an atomic absorption or fluorescence spectroscope, electromagnetic radiation is directed on to free atoms under investigation, in the vapour phase. The vapour is formed by the heating of a graphite body, on which a sample has been deposited, inside a borosilicate glass chamber having an inert atmosphere. The carbon body comprises a graphite rod heated electrically by means of tungsten leads sealed into the chamber. In an alternative form, where an enclosing dome causes unwanted reflections, the dome may be removed and the graphite rod is shielded from the ambient atmosphere by a curtain of inert gas. A gas inlet is provided by a tube extending almost up to the rod level, through which an inert gas is projected round the rod.