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The time-resolved fluxes of negative polysilicon hydride ions from a power-modulated rf silane plasma have been measured by quadrupole mass spectrometry and modeled using a simple polymerization scheme. Experiments were performed with plasma parameters sui ...
Periodic operation was applied to the CO2 methanation reaction at 383 K on 2% Ru/TiO2. A continuous feed recycle reactor combined with a diffuse reflectance infrared cell and a mass spectrometer allowed to follow simultaneously the gas phase CO2 and CH4 as ...
Negative ions have been clearly identified in silane rf plasmas used for the deposition of amorphous silicon. Mass spectra were measured for monosilicon up to pentasilicon negative ion radical groups in power-modulated plasmas by means of a mass spectromet ...
Stable negative ions containing up to sixteen silicon atoms have been measured by mass spectrometry in RF power-modulated silane plasmas for amorphous silicon deposition. These hydrogenated silicon cluster ions reach much higher masses than the positive io ...
The observation of a wedge-shaped semiconductor specimen by transmission electron microscopy (WTEM) is an interesting alternative to conventional TEM. Information on chemical composition, layer thickness down to atomic resolution, spatial extension of the ...
In this paper we present the first results obtained with a plasma ion mass spectrometer in the boundary of the TEXTOR tokamak. Measurements were made several days after TEXTOR was boronised. Comparisons are made with results obtained in DITE under similar ...
Matrix-assisted laser desorption ionization mass spectroscopy (LDI MS), a novel method for analysis of large molecules, has been used for characterization of synthetic peptides and their by-products. The potential of LDI MS is demonstrated by analyzing cru ...
Ion cyclotron modes excited in a low density, cylindrical plasma cavity using an external inductive antenna are investigated theoretically and experimentally. These modes, which have a long parallel wavelength, exhibit a strong electrostatic character and ...
Reversed-phase HPLC can not be relied on as the only chromatog. step for the purifn. and anal. of synthetic peptides larger than 30 to 40 residues; therefore their purity should be documented by more than one anal. technique. Narrow-bore ion-exclusion chro ...
Methods and spectrometers for carrying out ion-cyclotron-resonance spectrometry are described in which a pulse sequence is employed which is described by P1-t1-P2-Tm-P3-t2, (P1, P2, and P3 are radio-frequency pulses, with P1 and P2 having the same frequenc ...