Measurement of particle density, porosity, and size distributions by sedimentation/steric field-flow fractionation: application to chromatographic supports So far it has been assumed that the effect of the sample ions on the conductivity of the water plug and the column buffer is negligible. This is...
Approximate formulae are obtained for the cross-sections for excitation of ions of any complexity to highly excited levels by electron impact. These formulae are expressed in a simple way in terms of cross sections of the same form as hydrogenic cross sections. Results are given for the cases...
Approximate formulae from momentum-transfer theory for the mobility and diffusion coefficients of ions in gas mixtures are tested. Most of the test data are simulations obtained from moment solutions of the Boltzmann equation. The mobility formula works well, but requires some simple iteration; a ...
High-quality atomic data concerning the interaction of photons with highly ionized ions of iron are an essential requirement in the modelling of X-ray emis... D Donnelly,KL Bell,FP Keenan - 《Monthly Notices of the Royal Astronomical Society》 被引量: 18发表: 2010年 加载更多0...
N-oxide. Subsequently, the MS2 spectrum provided a series of characteristic fragment ions for the benefit Scientific Reports | 5:11638 | DOI: 10.1038/srep11638 3 www.nature.com/scientificreports/ Figure 3. The proposed fragmentation pathways of 14-hydroxy-2-isobutyrylhetisine N-oxide (a), ...
1, which was selected as the cutoff value to find the most important variables42, was used to extract novel potential biomarker ions with the PLS-DA model. The PLS-DA analyses were applied using SIMCA-P 12.0 software (Umertrics, Umea, Sweden). 1. Strong, K., Mathers, C. & Bonita, ...
A simple interactive BASIC program for calculating ‘precise’ (single isotopic), average and nominal masses of a molecular ion and all fragment ions is described.R. HillNational HeartH. FalesNational HeartC. McNeilNational HeartR. Macfarlane...
This method is applied to calculate the excitation functions for one and two-proton transfer reactions induced in 209 Bi by heavy ions, below and near the barrier. The curves obtained are compared to the excitation functions measured for the production of residual 210 Po and 211 At. The ...
Electron-impact double-ionization processes of light positive ions from He- to Ne-like isoelectronic sequences, as well as of the heavy ions Ar(q = 1-7) and Kr (q = 1-4) are considered for incident-electron energies E < 50 Iwhere Iis the threshold energy for double-electron ionization...
A simple interactive BASIC program for calculating ‘precise’ (single isotopic), average and nominal masses of a molecular ion and all fragment ions is described.R. HillNational HeartH. FalesNational HeartC. McNeilNational HeartR. MacfarlaneNational HeartBiomedical Mass Spectrometry...