Peer Reviewed: Pulsed Glow Discharge: Temporal Resolution in Analytical Spectroscopy

Harrison, W. W.; Yang, Chenglong; Oxley, Eric

doi:10.1021/ac012502g

Cited by 38 publications

(51 citation statements)

References 19 publications

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“…As can be observed, the calculated RSDs depend on the content of the element in the NIST 1262b and also on the operating mode (non-pulsed or pulsed RF). For instance, in pulsed RF mode the elements with low content in the sample show higher RSD (see 11 …”

Section: Stability Reproducibility and Sensitivitymentioning

confidence: 99%

A comparison of non-pulsed radiofrequency and pulsed radiofrequency glow discharge orthogonal time-of-flight mass spectrometry for analytical purposes

Lobo

Pisonero

Bordel

et al. 2009

J. Anal. At. Spectrom.

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The analytical potential of a radiofrequency glow discharge orthogonal time-of-flight mass spectrometer (RFGD-TOFMS) has been evaluated in both pulsed and non-pulsed modes. A certified reference steel was selected for this study. The operating conditions of the GD plasma (pressure and applied power) were optimized in terms of sensitivity. Additionally, duty cycle and pulse width parameters were investigated in the pulsed RF mode. In this case, high analyte ion signals and improved signal to background ratios were measured after the end of the pulse, in the so-called afterglow domain. The analyte ion signals were normalized to sputtering rates to compare different operating conditions. It was found that the sensitivity in the pulsed mode was improved in comparison to the non-pulsed mode; however, the factor of enhancement is element dependent. Moreover, improved analytical performance was obtained in terms of ion separation capabilities as well as in terms of accuracy and precision in the evaluation of the isotopic ratios, using the pulsed RFGD-TOFMS. Additionally, depth profile analyses of a Zn/Ni coating on steel were performed and the non-pulsed and pulsed RFGD-TOFMS analytical performances were compared.

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Section: Stability Reproducibility and Sensitivitymentioning

confidence: 99%

A comparison of non-pulsed radiofrequency and pulsed radiofrequency glow discharge orthogonal time-of-flight mass spectrometry for analytical purposes

Lobo

Pisonero

Bordel

et al. 2009

J. Anal. At. Spectrom.

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show abstract

“…Short microsecond pulses with high instantaneous powers increase the sputtering, excitation and the ionization. Time gated operation allows the separate measurement of the pre-peak or the after-peak with special analytical properties [107][108][109].…”

Section: Voltage Current and Power Measurement For Pulsed Dischargesmentioning

confidence: 99%

Electrical measurements at radio frequency glow discharges for spectroscopy

Wilken

Hoffmann

Wetzig

2007

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…However, pulsed operation of the glow discharge provides the ability to separate these processes in temporal sequence: A prepeak dominated by electron ionization, an afterpeak dominated by Penning ionization, and a plateau resembling the continuous glow discharge [8,9]. The temporal alternation of energy transfer processes results in a time-dependent P() that varies over a wide energy range.…”

mentioning

confidence: 99%

Millisecond pulsed radio frequency glow discharge time of flight mass spectrometry: Temporal and spatial variations in molecular energetics

Millay

Turner

et al. 2004

J. Am. Soc. Mass Spectrom.

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The internal energy distributions, P(epsilon), of a millisecond pulsed radio frequency glow discharge plasma were investigated using tungsten hexcarbonyl W(CO)(6) as a "thermometer molecule". Vapor of the probe molecule, W(CO)(6), was introduced into the plasma and subjected to various ionization and excitation processes therein. The resultant molecular and fragment ions were monitored using a Time-of-Flight mass spectrometer. Ion abundance data were utilized in combination with the known energetics of W(CO)(6) to construct the P(epsilon) plots. The P(epsilon) of W(CO)(6) exhibited strong temporal dependence over the pulse cycle: Distinct internal energy distributions were found at the discharge breakdown period (prepeak), the steady state period (plateau), and the post-pulse period (afterpeak). Spatial variation in P(epsilon) was also observed, especially during the plateau regime. The observations suggest that this pulsed glow discharge affords excellent energy tunability that can be used to perform selective ionization and fragmentation for molecular, structural, and elemental information. Parametric studies were performed to evaluate the effects of discharge pressure and operating power on P(epsilon). These studies also provided insight into the correlation of the observed P(epsilon)s with the fundamental ionization and excitation mechanisms in the plasma. The temporal and spatial variations in P(epsilon) were hence attributed to changes in the dominant energy transfer processes at specific times in specific regions of the plasma. These data will be useful in future efforts to optimize the analytical performance of this source for chemical speciation.

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Peer Reviewed: Pulsed Glow Discharge: Temporal Resolution in Analytical Spectroscopy

Cited by 38 publications

References 19 publications

A comparison of non-pulsed radiofrequency and pulsed radiofrequency glow discharge orthogonal time-of-flight mass spectrometry for analytical purposes

A comparison of non-pulsed radiofrequency and pulsed radiofrequency glow discharge orthogonal time-of-flight mass spectrometry for analytical purposes

Electrical measurements at radio frequency glow discharges for spectroscopy

Millisecond pulsed radio frequency glow discharge time of flight mass spectrometry: Temporal and spatial variations in molecular energetics

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