Atomic single beam spectrophotometer

Atomic absorption spectrophotometers (Figure 10.37) are designed using either the single-beam or double-beam optics described earlier for molecular absorption spectrophotometers (see Figures 10.25 and 10.26). There are, however, several important differences that are considered in this section. 

FIGURE 9.14 An illustration of the light path for a single-beam atomic absorption spectrophotometer with a... 

The schematic diagram of a single-beam atomic spectrophotometer in illustrated in Figure 26.1. A = Anode (Tungsten),... 

Figure 26.1 Schematic Diagram of a Single-Beam Atomic Absorption Spectrophotometer.

The optical scheme of an atomic absorption spectrophotometer is illustrated in Fig. 14.4, which shows a basic single beam instrument. 

Figure 14.4—The diverse components of a single beam atomic absorption spectrophotometer. Model IL 157, built in the 1980s. 1, source 2, burner 3, monochromator 4, detector (design according to Thermo Jarrell Ash Corp.).

Most commercially available atomic absorption spectrophotometers have damping built in. Single beam instruments can usefully employ damping time constants up to about 20 seconds. Double beam instruments, with their greater freedom from drift, can benefit from damping time constants as high as two minutes. 

Simultaneous multicomponent determinations, 361 Sine waves, 33, 34, 508,956 mathematical description, 135 superposition. 137 Single-beam computerized spectrophotometers, 358 grating instruments, 357 instruments, 240, 241, 351 for atomic spectroscopy, 240 efl ect of mismatched cells, 343 for molecular absorption measurements, 351 advantages, 358 Singlet state, 216, 400-402,411 excited, 216,400,401,405 Size distributions, measuring, 951. 955, 961... 

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