Measurements of electron capture and ionization of O2 molecules in collisions with H + and O ions have been made over an energy range 10–100 keV. Cross sections for dissociative and nondissociative interactions have been separately determined using coincidence techniques. Nondissociative channels leading to O2 product formation are shown to be dominant for both the H and the O projectiles in th...

Finding insights into how viruses hijack metabolic processes and biomarkers for viral diseases often require hypotheses about target compounds and/or labelling techniques. Here we present a method based on laser ablation electrospray ionization mass spectrometry to rapidly identify potential protein and metabolite biomarkers of oncovirus infection in B lymphocytes.

This study presents results on the detection of CH, in low-pressure methane-oxygen flames using resonance-enhanced multiphoton ionization (REMPI) techniques. Experiments in a discharge-flow reactor were performed for optimization purposes. Excitation wavelengths near 286 and 333 nm were examined: the former is not recommended for flame applications, although it may be preferable under flow reac...

We investigate molecular beam methods for gold nanoparticles. They are based on electrospray, matrix assisted laser desorption and thermal laser desorption in combination with mass spectroscopy and multi-photon ionization. These techniques are analyzed with respect to their potential for coherent matter wave experiments. 2006 Elsevier B.V. All rights reserved.

High-field reliability issues connected with hot electron and impact ionization are typically the reliability bottleneck of power FETs for microwave and millimeter-wave applications. This work deals with some aspects of this problem, from characterization and accelerated stressing techniques to the physical degradation mechanisms, using power AlGaAs/GaAs HFETs as a test vehicle.

A time-of-flight mass spectrometer (TOF-MS) developed in our laboratory at Isfahan University of Technology is described here. The TOF-MS instrument uses laser as the ionization source which provides an opportunity to investigate the ions formed in laser ablation or desorption. The TOF-MS has an ionization chamber containing an accelerator and an ion lens to focus the ions into a one meter line...

Ambient ionization (AI) techniques have been widely used in chemistry, medicine, material science, environmental science, forensic science. AI takes advantage of direct desorption/ionization of chemicals in raw samples under ambient environmental conditions with minimal or no sample preparation. However, its quantitative accuracy is restricted by matrix effects during the ionization process. To...

6 [1] Electron capture and ionization cross sections for protons and nitrogen ions incident 7 on N2 are measured in the energy range 10–100 keV using time of flight (TOF) 8 coincidence counting techniques. In the case of proton impact the formation of N2 + ions 9 dominates for both electron capture and ionization channels at all energies, whereas 10 for N ions, the N2 + formation dominates for ...

The single ionization of inner-shell bound electrons by lepton impact is a fundamental atomic process of particular interest. Recently, essential progress has been achieved in fragmentation experiments due to developments in many-particle imaging techniques, so-called reaction microscopes [1]. The measurements of the multiply differential cross sections become now feasible. We have deduced the ...