Secondary discharge in fast flow Grimm-type microsecond pulsed glow discharge source for mass spectrometry

Computer simulations of argon–hydrogen Grimm-type glow discharges

“…We don't think that this will have a large impact on the plasma chemistry; however, it means that our calculation results might not be applicable to conditions where the gas flow is essential. 4,5 Indeed, such fast-flow glow discharge cells can generate a secondary plasma, as was recently demonstrated by Voronov and Hoffmann, 31 and this might further complicate the situation.…”

Thermal mechanism for formation of electrical prepeak and pressure waves in a microsecond direct current pulsed glow discharge with a Grimm-type source: a modeling investigation

“…Extrapolation of the cross-section to lower energies is not straightforward because the cross-sections change rapidly at low energies. To solve this problem the Ar-neutral model was employed to simulate the distribution of Ar inside a fast-flow GD source 35 but in the absence of a plasma. The pressure inside the chamber was measured near the cathode surface as a function of the gas flow.…”

New μs-pulsed DC glow discharge assembly on a fast flow high power source for time resolved analysis in high resolution mass spectrometry

“…16 A similar result was predicted from theoretical modelling on a fast flow Grimm-type GD source. 1,17 While secondary discharge ionisation in the space between the anode and the skimmer cone could not be completely eliminated, much higher pressure (1 mbar rather than 10 À5 mbar) would have to be reached to render it of any significant relevance to the tailing of ion signals.…”

“…Although the commercially available GDMS instruments are operating with continuous direct current glow discharge sources (dc-GD), it has been demonstrated earlier that significant improvement of analytical characteristics can be achieved with a GD source operated in mspulsed mode for both mass spectrometry and optical spectrometry methods. [1][2][3][4][5][6][7][8][9][10] The advantages of the ms-pulsed glow discharge source over a conventional continuous source, such as higher signal intensities, temporal profile resolution, additional sputtering control and high sample utilisation efficiency are reviewed by Harrison et al 4 ''If the average power over the measurement period is identical for pulsed and continuous wave glow discharges, there might appear to be no obvious gain by this method''. 4 However the pulsed glow discharge (PGD) operation permits the application of a higher voltage to produce higher plasma particle energies therefore increasing signal output.…”