Absolute intensities and perpendicular temperatures of supersonic beams of polyatomic gases

Beijerinck, H.C.W.; Verster, N.F.

doi:10.1016/0378-4363(81)90112-1

Cited by 139 publications

(149 citation statements)

References 12 publications

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“…When attempting to block the calibrant ions over an m/z range of 622 Da to 2122 Da with a jet disrupter, we found that transmission efficiency through this channel of the ion funnel was somewhat m/z-dependent with higher m/z ions being "disrupted" more readily than their lower m/z counterparts. This behavior is similar to the gas dynamic focusing of heavier species in a supersonic jet [47]. A further increase in the potential applied to the jet disrupter plate resulted in decreased transmission and increased intensity variations of the analyte species.…”

Section: Fticr Instrumentationsupporting

confidence: 59%

An automated high performance capillary liquid chromatography-Fourier transform ion cyclotron resonance mass spectrometer for high-throughput proteomics

Belov

Anderson

Wingerd

et al. 2004

J. Am. Soc. Mass Spectrom.

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We describe a fully automated high performance liquid chromatography 9.4 tesla Fourier transform ion resonance cyclotron (FTICR) mass spectrometer system designed for proteomics research. A synergistic suite of ion introduction and manipulation technologies were developed and integrated as a high-performance front-end to a commercial Bruker Daltonics FTICR instrument. The developments incorporated included a dual-ESI-emitter ion source; a dualchannel electrodynamic ion funnel; tandem quadrupoles for collisional cooling and focusing, ion selection, and ion accumulation, and served to significantly improve the sensitivity, dynamic range, and mass measurement accuracy of the mass spectrometer. In addition, a novel technique for accumulating ions in the ICR cell was developed that improved both resolution and mass measurement accuracy. A new calibration methodology is also described where calibrant ions are introduced and controlled via a separate channel of the dual-channel ion funnel, allowing calibrant species to be introduced to sample spectra on a real-time basis, if needed. We also report on overall instrument automation developments that facilitate high-throughput and unattended operation. These included an automated version of the previously reported very high resolution, high pressure reversed phase gradient capillary liquid chromatography (LC) system as the separations component. A commercial autosampler was integrated to facilitate 24 h/day operation. Unattended operation of the instrument revealed exceptional overall performance: Reproducibility (1-5% deviation in uncorrected elution times), repeatability (Ͻ20% deviation in detected abundances for more abundant peptides from the same aliquot analyzed a few weeks apart), and robustness (high-throughput operation for 5 months without significant downtime). When combined with modulated-ionenergy gated trapping, the dynamic calibration of FTICR mass spectra provided decreased mass measurement errors for peptide identifications in conjunction with high resolution capillary LC separations over a dynamic range of peptide peak intensities for each spectrum of 10 3 , and Ͼ10 5 for peptide abundances in the overall separation. (J Am Soc Mass Spectrom 2004, 15, 212-232)

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Section: Fticr Instrumentationsupporting

confidence: 59%

An automated high performance capillary liquid chromatography-Fourier transform ion cyclotron resonance mass spectrometer for high-throughput proteomics

Belov

Anderson

Wingerd

et al. 2004

J. Am. Soc. Mass Spectrom.

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“…The electron density also decreases with the square of the axial coordinate. [5][6][7][8][9][10][11][12][13][14][15] In Fig. 4 the experimental values and the modeling results show the same decrease.…”

Section: ͑21͒mentioning

confidence: 89%

Plasma expansion in the preshock region

Burm

Goedheer

Schram

2001

Journal of Applied Physics

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The supersonic expansion of an underexpanding argon plasma from a high density arc source with small dimensions into a low-pressure vessel with large dimensions is studied by an extended one-dimensional nonlocal thermal equilibrium fluid model, called SPIRIT. In an expanding plasma the velocity increases and the pressure, the density, and the temperatures decrease severely. In this article the virtual source model is discussed first, which is a model describing the expanding plasma as originating from a virtual source. The virtual source model includes some viscosity and heat transport in simplified form, but most of the viscosity and heat transport contributions are neglected. The SPIRIT code includes the full energy and momentum balances. The inclusion of viscosity and heat sources may lead to deviations from an adiabatic and/or isentropic expansion. The SPIRIT code can analyze the deviations. When deviations are small, the isentropic expressions from gas dynamics can be used to model expanding plasma too. Model outcomes are compared with experimental data.

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“…l L does not limit contrast in the results presented below, but it does provide a fundamental limit on our ultimate spatial resolution. Transverse coherence refers to the degree of regularity of wave fronts perpendicular to the propagation direction [18] and in molecular beams is related to the less-wellstudied perpendicular velocity distribution [15,20]. To improve the limited transverse coherence of a free-jet source, we insert a spatial filter composed of two pinholes that set the transverse phase space acceptance at the level of the Heisenberg Uncertainty Principle.…”

Section: Speckle Patterns With Atomic and Molecular De Broglie Wavesmentioning

confidence: 99%

Speckle Patterns with Atomic and Molecular de Broglie Waves

et al. 2006

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Absolute intensities and perpendicular temperatures of supersonic beams of polyatomic gases

Cited by 139 publications

References 12 publications

An automated high performance capillary liquid chromatography-Fourier transform ion cyclotron resonance mass spectrometer for high-throughput proteomics

An automated high performance capillary liquid chromatography-Fourier transform ion cyclotron resonance mass spectrometer for high-throughput proteomics

Plasma expansion in the preshock region

Speckle Patterns with Atomic and Molecular de Broglie Waves

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