Glow discharge ion source

The glow discharge ion source is simple yet versatile, providing information for emission and mass spectrometric methods.92 A glow discharge ion source combined with a mass spectrometer has supplanted the spark ion source over many decades as the predominant ionization technique of mass spectrometry for determining trace and ultratrace element concentrations in various types of 

The ionization mechanisms97 taking place in an argon glow discharge are  

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Demonstration of GDMS feasibility and research into glow-discharge processes has been carried out almost exclusively using the combination of a glow-discharge ion source with a quadrupole mass spectrometer (GDQMS). The combination is inexpensive, readily available and suitable for such purposes. In addition, the quadru-... 

The ion source is an essential component of all mass spectrometers where the ionization of a gaseous, liquid or solid sample takes place. In inorganic mass spectrometry, several ion sources, based on different evaporation and ionization processes, such as spark ion source, glow discharge ion source, laser ion source (non-resonant and resonant), secondary ion source, sputtered neutral ion source and inductively coupled plasma ion source, have been employed for a multitude of quite different application fields (see Chapter 9). 

Figure 2.23 Principle of glow discharge ion source with planar (disc) cathode.

Figure 2.24 Representation of a glow discharge ion source with pin-shaped cathode.

Table 2.1 Main characteristics of glow discharge ion source modifications.108...

Glow discharge ion source in Ar plasma Penning and e ionization plasma 3000-6000 ne 1015 cm-3 M+ low pressure double-focusing SFMS (reverse Nier-Johnson) traces, high-purity metals... 

A GD mass spectrometer from Thermo Fisher Scientific with a direct current (dc) glow discharge ion source based on the mass spectrometric arrangement of the Element (Element GD) has been available on the analytical market since 2005 for sensitive multi-element analysis of trace impurities in conducting samples. The experimental arrangement of the dc GD ion source (Grimm type) and... 

Figure 5.28 Direct current glow discharge ion source a) schematic, b) photograph of Element CD (Thermo Fisher Scientific, Bremen, German), Reproduced by permission of Thermo Fisher Scientific,...

Figure 6.7 Part of a mass spectrum for silicon determination at m/z = 28 in high purity GaAs measured by rf GDMS (Element, Thermo with rf glow discharge ion source constructed in our lab). The interfering polyatomic ions 12CuO+ and UN2+ are well separated at mass resolution m/Am of 3000. (J. S. Becker et ai, Int. J. Mass Spectrom. 164, 81 (1995). Reproduced by permission of Elsevier.)...

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