Explicit chemical speciation by microsecond pulsed glow discharge time-of-flight mass spectrometry: concurrent acquisition of structural, molecular and elemental information

Majidi, Vahid; Moser, M. Theresa; Lewis, C.L.; Hang, Wei; King, Fred L.

doi:10.1039/a905477d

Cited by 80 publications

(72 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, glow discharge time-of-flight mass spectrometer (GD TOFMS) has the ability to collect both atomic and molecular ions, providing additional information about the chemical species. [3] Further, radio frequency (rf) glow discharge ion sources allow non-conducting samples to be analysed. [4] The pulsed rf source gives a signal enhancement in the afterglow regime (which appears after termination of the discharge power), which is mainly attributed to positive ions creation through Penning ionisation processes.…”

Section: Introductionmentioning

confidence: 99%

¹⁸O/¹⁶O isotopic separation in anodic tantala films by glow discharge time‐of‐flight mass spectrometry

Tempez

Canulescu

Молчан

et al. 2009

Surface & Interface Analysis

View full text Add to dashboard Cite

Glow discharge mass spectrometry has been widely used for trace and ultra-trace element analysis of high-purity alloys. A novel pulsed radio frequency glow discharge time-of-flight mass spectrometer (rf GD TOFMS) has been developed that retains the pulsed radio frequency analytical ion source to provide ion signal enhancement due to processes involving Penning ionisation. A time-resolved detection mode has been implemented to sample the afterglow regime of the pulse profile, corresponding to the highest ion signal intensities. Here, the performance of rf GD TOFMS in isotope differentiation is discussed. Anodic tantala films, comprising 18 O-rich layers of controlled thicknesses and locations, were formed by appropriate combination of anodising of tantalum in electrolytes enriched with 18 O isotopes and of natural O isotopic abundance. Transmission electron microscopy (TEM) and radio frequency glow discharge optical emission spectrometry (rf GD OES) analyses were performed to examine the morphology and elemental distributions of the specimens, while the content of 18

show abstract

Section: Introductionmentioning

confidence: 99%

¹⁸O/¹⁶O isotopic separation in anodic tantala films by glow discharge time‐of‐flight mass spectrometry

Tempez

Canulescu

Молчан

et al. 2009

Surface & Interface Analysis

View full text Add to dashboard Cite

show abstract

“…Majidi and co-workers extended this methodology to the microsecond pulse regime for speciation studies, which is normally not feasible by GD techniques (19). Samples were introduced directly in the vapor state-p-xylene, toluene, and tungsten hexacarbonyl in this example-and multiple sampling was carried out during and after the pulse.…”

Section: O Ot Th He Er R a An Na Al Ly Yt Ti Ic Ca Al L C Co On Ns Simentioning

confidence: 99%

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

Harrison¹,

Yang²,

Oxley³

2001

Anal. Chem.

View full text Add to dashboard Cite

Atom density decreases as the black fades to orange. (a) dc mode. The device consists of a negative cathode and a grounded anode immersed in a low-pressure rare gas, usually argon. A potential (V) breaks down the discharge fill gas, yielding Ar + that is attracted to the cathode-which, in this case, is the sample. The ions collisionally sputter neutral atoms from the surface into the adjacent GD plasma. As these sputtered atoms diffuse through the GD plasma, collisions with electrons, ions, and metastable atoms excite and ionize the sample atoms. (b) Pulsed mode operates on the same principles described for dc mode, but in short, repetitive dc pulses.

show abstract

“…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]. These regimes, prepeak, plateau, and afterglow, provide different information about the composition of a sample [17].…”

Section: Introductionmentioning

confidence: 99%

“…A pulsed GD coupled to a gas chromatography system was also reported by Fliegel et al [19], where elemental and molecular information from gaseous analytes such as toluene in methanol as solvent was demonstrated. In addition, Majidi et al [16] showed the possibility of performing the chemical speciation of volatile compounds using a μs-pulsed GD-TOF system. The analysis of solid samples has been reported by Tarik et al [20] where organic compounds including benzoic acid, vanillic acid, Teflon, and caffeine have been introduced into the GD-TOFMS by laser ablation.…”

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

View full text Add to dashboard Cite

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.

show abstract

Explicit chemical speciation by microsecond pulsed glow discharge time-of-flight mass spectrometry: concurrent acquisition of structural, molecular and elemental information

Cited by 80 publications

References 18 publications

¹⁸O/¹⁶O isotopic separation in anodic tantala films by glow discharge time‐of‐flight mass spectrometry

¹⁸O/¹⁶O isotopic separation in anodic tantala films by glow discharge time‐of‐flight mass spectrometry

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

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

Contact Info

Product

Resources

About

Explicit chemical speciation by microsecond pulsed glow discharge time-of-flight mass spectrometry: concurrent acquisition of structural, molecular and elemental information

Cited by 80 publications

References 18 publications

18O/16O isotopic separation in anodic tantala films by glow discharge time‐of‐flight mass spectrometry

18O/16O isotopic separation in anodic tantala films by glow discharge time‐of‐flight mass spectrometry

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

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

Contact Info

Product

Resources

About

¹⁸O/¹⁶O isotopic separation in anodic tantala films by glow discharge time‐of‐flight mass spectrometry

¹⁸O/¹⁶O isotopic separation in anodic tantala films by glow discharge time‐of‐flight mass spectrometry