By J. Sneddon
This sequence describes chosen advances within the sector of atomic spectroscopy. it's promarily meant for the reader who has a historical past in atmoic spectroscopy; compatible to the beginner and specialist. even supposing a time-honored and permitted approach for steel and non-metal research in a number of advanced samples, Advances in Atomic Spectroscopy covers quite a lot of fabrics. every one bankruptcy will thoroughly conceal a space of atomic spectroscopy the place fast improvement has occurred.
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Additional info for Advances in atomic spectroscopy. / Volume 2
Energy level diagrams for longitudinal and transverse Zeeman are shown in Figure 18. When the magnetic field is off ("field off") for either configuration, absorption of laser light by analyte atoms is possible, and hence both fluorescence and background signals are measured. With the magnetic field on ("field on"), using longitudinal excitation (Figure 18a), the atomic energy levels are split into two sigma components whose wavelengths are displaced away from the analyte wavelength, and hence no absorption (and fluorescence) by the analyte is possible.
In the presence of the magnetic field, only background is measured. Subtraction of the "field on" measurement from the "field off" measurement gives a backgroundcorrected signal. In the case of transverse excitation with the magnetic field on, the atomic energy levels are split into three linearly polarized components, two sigma and one pi (Figure 18b). The pi component is at the same wavelength as the atomic transition, and it is necessary to prevent absorption of the pi component in order to do background correction.
Second, this technique can be employed with any atom cell because it involves modification of the detection system. Third, this multichannel method can be used with any laser repetition rate. The principal disadvantage of this technique is that the background correction measurement was made 3-4 nm away from the analytical wavelength. This technique will not be able to accurately correct for background signals whose size varies between the analytical and background wavelengths (structured background).