Dispersing quality system element

To locate the specific radiations of an element to be quantified (the different analytical lines) an optical bench of very high quality is required. These apparatuses can be divided into spectrographs and spectrometers (Figure 14.8 and see also Figure 9.12). As above pointed out, the source illuminates a slit which becomes a luminous object, which will be analysed by a dispersive system containing a grating (planar, concave or echelle). 

In general, stability means the quality of a substance or a system to remain at the same state. In practice, one needs to specify if state refers to the isotopes of elements, the chemical composition, the state of matter, or something else. When talking about the stability of colloidal suspensions or suspension stability, one usually addresses the size distribution of the particles, the homogeneity of the disperse system, and/or the stmcture of the suspension. Hence, the meaning of suspension stability is somewhat ambiguous. Moreover, a suspension can be... 

The actual shape of a band is the result of several instrumental characteristics including the overall quality of the optics and detector systems, as well as the width and positions of the entrance and exit slits. Every dispersive spectrometer consists of a dispersive element (e.g., diffraction grating) in combination with an entrance and an exit slit. The image of the entrance slit and exit slit determines the spectrometer bandpass, which is sometimes referred to as the slit function. Actually, the slit function is the result of the... 

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