Radio Frequency Glow Discharge Mass Spectrometry

6 Radio Frequency Glow Discharge Mass Spectrometry 

Shick and co-workers [331] used this technique for the characterisation of bulk polymers such as PTFE-methyl vinyl ether and PTFE-hexafluoropropylene-polyvinylidene fluoride. 

This is a technique that combines thermal analysis and atomic force microscopy. This new technique is discussed in a series of papers published by ASTM in 1999 [332] and other workers [333-338]. 

Workers at TA Instruments UK, manufacturer of thermal micro-analysis equipment, have given details of the model TA 2990 system. They give examples of its application to thermal and morphological problems [339]. 

Microthermal analysis combines the visualisation power of AFM with the characterisation ability of thermal analysis [333]. The AFM head is fitted with an ultra-miniature thermal probe, which provides not only topographic and thermal contrast information, but also information similar to traditional thermal analysis on a sub-micrometre scale. 

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S. DeGendt, R.E. Van Grieken, S.K. Ohorodnik and W.W. Harrison, Parameter evaluation for the analysis of oxide-based samples with radio frequency glow discharge mass spectrometry, Anal. Chem., 67 (1995) 1026-1033. 

Figure 7 Radio frequency glow discharge mass spectrometry (rf GD-MS) source designs employed on a VG GloQuad instrument for the analysis of a, Pin-type samples. (From Ref. 28.) b, Flat samples. (From Ref. 29.)...

This chapter deals exclusively with the methods that have been developed for the direct solids analysis of nonconductive samples by glow discharge mass spectrometry. The basic approaches to operation and sample preparation for the three primary methodologies of compaction, secondary cathode, and radio frequency powering are described. Examples of source performance and practical applications of each are taken from the analytical literature. Whereas this chapter de-... 

Figure 24 Radio frequency glow discharge time-of-flight mass spectrometry (GD-TOF-MS) spectra of silica glass at (a) 4.0 msec after power onset (plateau) and (b) 7.0 msec after power onset (afterpeak). (From Ref. 58.)...

Saprykin A. I., Melchers F. G., Becker J. S. and Dietze H. J. (1995) Radio-frequency glow discharge ion source for high resolution mass spectrometry, Fresenius J Anal Chem 353 570-574. 

EMDPA project, New Elemental and Molecular Depth Profiling Analysis of Advanced Materials by Modulated Radio Frequency Glow Discharge Time of Fhght Mass Spectrometry , Vlth European Framework (2009) http // www.emdpa.eu... 

Duckworth, D.C. Marcus, R.K. Radio Frequency Powered Glow Discharge At-omization/Ionization Source for Solids Mass Spectrometry. Anal. Chem. 1989, 61, 1879-1886. 

Shick et af used radio frequency powered glow discharge atomization/ionization mass spectrometry (Rf GDMS) for the characterisation of bulk polymers. Fingerprint mass spectra were obtained for a series of polytetrafluoroethylene based polymers by looking at the differing base peaks and relative peak intensities. The technique exhibited excellent discharge stabilization and internal stability characteristics with a relative... 

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