Trends in glow discharge spectroscopy

Jakubowski, Norbert; Dorka, Roland; Steers, Edward B. M.; Tempez, A.

doi:10.1039/b705238n

Cited by 74 publications

(34 citation statements)

References 95 publications

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“…However, the generator power is usually coupled capacitive to the plasma, so that the plasma power decreases with increasing thickness, thus sputtering rates, sensitivities and signal intensity decrease at the same time. 19 In recent years, some efforts have been made to improve the ionization efficiency and detection sensitivity in GD-MS by utilization of power pulse 20 or adding external magnetic field. 16 The benefits of the external magnetic field classified as magnetron, have been successfully exploited in a variety of spectroscopies.…”

Section: Introductionmentioning

confidence: 99%

Signal Enhancement with Stacked Magnets for High-Resolution Radio Frequency Glow Discharge Mass Spectrometry

et al. 2017

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ABSTRACT:A method for signal enhancement utilizing stacked magnets was introduced into high-resolution radio frequency glow discharge-mass spectrometry (rf-GD-MS) for significantly improved analysis of inorganic materials. Compared to the block magnet, the stacked magnets method was able to achieve 50−59% signal enhancement for typical elements in Y2O3, BSO, and BTN samples. The results indicated that signal was enhanced as the increase of discharge pressure from 1.3 to 8.0 mPa, the increase of rf-power from 10 to 50 W with a frequency of 13.56 MHz, the decrease of sample thickness, and the increase of number of stacked magnets. The possible mechanism for the signal enhancement was further probed using the software "Mechanical APDL (ANSYS) 14.0". It was found that the distinct oscillated magnetic field distribution from the stacked magnets was responsible for signal enhancement, which could extend the movement trajectories of electrons and increase the collisions between the electrons and neutral particles to increase the ionization efficiency. Two NIST samples were used for the validation of the method, and the results suggested that relative errors were within 13% and detection limit for six transverse stacked magnets could reach as low as 0.0082 μg g −1 . Additionally, the stability of the method was also studied. RSD within 15% of the elements in three nonconducting samples could be obtained during the sputtering process. Together, the results showed that the signal enhancement method with stacked magnets could offer great promises in providing a sensitive, stable, and facile solution for analyzing the nonconducting materials.

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Section: Introductionmentioning

confidence: 99%

Signal Enhancement with Stacked Magnets for High-Resolution Radio Frequency Glow Discharge Mass Spectrometry

et al. 2017

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“…A pulsed glow discharge (GD), which is used in the trace elemental analysis of bulk solid samples [11] has the potential to overcome some of the shortcomings of other techniques. By using a pulsed GD, it is possible to achieve a high instantaneous pulse power, avoiding over heating of the cathode [12][13][14] and generating different temporal regimes [15,16].…”

Section: Introductionmentioning

confidence: 99%

Tunable fragmentation of organic molecules in laser ablation glow discharge time-of-flight mass spectrometry

Lotito¹,

Günther²

2011

Anal Bioanal Chem

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A DC-pulsed glow discharge (GD) has distinct temporal regimes which are characterized by "softer" or "harder" ionization of analytes introduced into the discharge. It is thus possible to obtain both molecular weight and structural fragment information from the same spectra. In order to extend the capabilities of this technique a laser ablation (LA) sampling system was coupled to a DC-pulsed GD and to a time-of-flight (TOF) mass spectrometer (MS) for characterizing organic samples such as oleic acid, reserpine, two different peptides, and a polymer. Both hard and soft ionization regimes were studied. These LAGD-TOFMS results were compared to matrix-assisted laser desorption ionization (MALDI) spectra using the same compounds (i.e., analytes, concentration, and matrix). It was found that LAGD offers tunable ionization and provides a reduced matrix dependence. However, the sensitivity achieved by the prototype LAGD-TOFMS was significantly lower when compared with commercially available MALDI-TOFMS instrumentation. Since LAGD-TOFMS is rather new, some technical details to increase its sensitivity are discussed.

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“…Further development of radiofrequency sources as well as the use of ''fast flow'' high powered sources is being currently investigated to improve the analytical capabilities of GD-MS and the sample throughput. 119 The use of a fast flowing glow discharge ion source allows high current, power, and sputtering rate, increasing the intensity of the analytes and their ratio to the water-derived ions. 108,120 Moreover, the analytical potential of modulated radiofrequency GD-TOFMS provides a unique ''multi-dimensional'' analysis tool, allowing simultaneous elemental and molecular quantification, with low sensitivity (<ppm) and high depth resolution (below 5 nm) in conductive and non-conductive thin layers, for most of the elements of the periodic table.…”

mentioning

confidence: 99%

Critical revision of GD-MS, LA-ICP-MS and SIMS as inorganic mass spectrometric techniques for direct solid analysis

Pisonero

Fernández

Günther

2009

J. Anal. At. Spectrom.

157

115

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Trends in glow discharge spectroscopy

Cited by 74 publications

References 95 publications

Signal Enhancement with Stacked Magnets for High-Resolution Radio Frequency Glow Discharge Mass Spectrometry

Signal Enhancement with Stacked Magnets for High-Resolution Radio Frequency Glow Discharge Mass Spectrometry

Tunable fragmentation of organic molecules in laser ablation glow discharge time-of-flight mass spectrometry

Critical revision of GD-MS, LA-ICP-MS and SIMS as inorganic mass spectrometric techniques for direct solid analysis

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