Glow-discharge sampling

The increased interest in glow-discharge techniques, initially in the academic world and later among instrument manufacturers, can be ascribed largely to their performance in solid sample analysis. 

One major strength of GD is the separation or sampling step (sputter atomization) from the subsequent analytical steps of excitation or ionization. The GD process can be 

Devices for treatment prior to introduction into atomic spectrometers 

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In essence, glow-discharge sampling is more closely related to the techniques described in Chapter 9 than to electrothermal devices however, it is discussed here both to facilitate comparisons and to balance the contents of the two chapters. 

Fig. 8.8. Analytical techniques most frequently coupled to glow-discharge sampling. / incident radiation, / attenuated radiation. (Reproduced with permission of the American Chemical Society.)...

Sample state and preparation for glow-discharge sampling... 

Glow-discharge sampling as coupled to spectrometric detection... 

Glow-discharge sampling provides a number of advantages that can be summarized as follows ... 

On the other hand, glow-discharge sampling is subject to the following shortcomings ... 

Applications of glow-discharge sampling in combination with spectrometries... 

In some sputtered samples, double-exponential spin-lattice relaxation rates have been observed (Lowry et al., 1981b). In these samples it has been suggested that faster rates occur at dihydride (SiHj) bonding sites and slower rates at monohydride sites. This two-component behavior for T, has not been reported in glow-discharge samples even when the infrared absorption measurements indicate dihydride bonding sites (Reimer et al., 1981c Carlos and Taylor, 1980). 

In CVD or glow-discharge samples that have been annealed to remove some of the hydrogen, the line at g = 2.0055 is observed before optical excitation (As 10 -lO " spins cm" ). In these samples Friederich and Kaplan (1980a,b) find an optically induced decrease in this resonance for... 

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