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Issue 8, 2015
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A glow discharge time-of-flight mass spectrometry (GD-TOFMS) study of the ‘hydrogen effect’ using copper, iron and titanium cathodes

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Abstract

We report TOFMS investigations on the effects of hydrogen added to a dc GD argon plasma, in detail over the most likely concentration range occurring in analytical work (0–0.10% v/v), together with an overview to 0.8% v/v; typical GD-OES discharge conditions were used. Many previous studies on the effects of hydrogen in analytical GD-MS used much higher hydrogen concentrations. In this paper, we report for the first time the ‘hydrogen effect’ on relative ion signal intensities of matrices, plasma and added gas, for very low but analytically important hydrogen concentrations. We investigate the behavior of doubly charged argon ions (Ar++), dimer ions (Cu2+, Fe2+, Ti2+, Ar2+) and polyatomic ions (ArH+, CuH+, FeH+, TiH+), which can play important roles in plasma processes. We discuss the probable discharge mechanisms in order to gain a greater understanding of the fundamental processes involved in the ionization of the species observed in this study and their likely effects on analytical results. We propose a mechanism to explain the increase in the matrix signal which occurs if an argon/hydrogen mixture is used as the plasma gas.

Graphical abstract: A glow discharge time-of-flight mass spectrometry (GD-TOFMS) study of the ‘hydrogen effect’ using copper, iron and titanium cathodes

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Article information


Submitted
30 Mar 2015
Accepted
24 Jun 2015
First published
24 Jun 2015

J. Anal. At. Spectrom., 2015,30, 1774-1781
Article type
Paper

A glow discharge time-of-flight mass spectrometry (GD-TOFMS) study of the ‘hydrogen effect’ using copper, iron and titanium cathodes

S. Mushtaq, E. B. M. Steers, J. A. Whitby, P. Horvath, J. Michler and J. C. Pickering, J. Anal. At. Spectrom., 2015, 30, 1774
DOI: 10.1039/C5JA00112A

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