The use of silicon nanoparticles for laser desorption/ionization (LDI) is a new appealing matrix-less approach for the selective and sensitive mass spectrometry of small molecules in MALDI instruments. Chemically modified silicon nanoparticles (30nm) were previously found to require very low laser fluence in order to induce efficient LDI, which raised the question of internal energy deposition ...

The Independent Event Model (IEVM) is used to analyze collision processes for systems with three and four electrons, in situations where up to three active electrons are involved and dynamical correlation effects play a major role. The model is applied to single electron loss and loss-ionization processes. All the possible ionization mechanisms for both collision partners in each exit channel a...

A.) Neutral Acylglycerols and Free Fatty Acids by ESI/MS/MS ....................................... 7 A.1.) Structural characterization of triacylglycerols as lithiated adducts by electrospray ionization mass spectrometry using low-energy collisionally activated dissociation on a triple stage quadrupole instrument. ...................................................................................

We applied the two-color resonant two-photon ionization and mass-analyzed threshold ionization techniques to record the vibronic and cation spectra of 2,4-difluorophenol. As supported by our theoretical calculations, only the cis form of 2,4-difluorophenol involves in the two-photon photoexcitation and pulsed field ionization processes. The band origin of the S1 ← S0 electronic transition of ci...

Applying Gibb’s geometrical methods to the thermodynamics of H-plasmas we explore the landscape of the free energy as a function of the degrees of ionization and dissociation. Several approximations for the free energy are discussed. We show that in the region of partial ionization/dissociation the quantum Debye-Hückel approximation (QDHA) yields a rather good but still simple representation wh...

The current manuscript presents 3-[5'-(methylthio)-2,2'-bithiophen-5-ylthio]propanenitrile (MT3P), as a novel matrix molecule, which facilitates the selective ionization of alkaloids in matrix-assisted laser desorption/ionization mass spectrometry. Exhibiting strong ionizing properties at low levels of laser energy, MT3P was evaluated on 55 compounds belonging to various chemical families. The ...

A two dimensional semiclassical approximation is used to examine the σ polarization spectrum of a hydrogen like atom in a strong magnetic field. Resonances above the zero field ionization limit are found and their energy separations are computed over the region from the ionization limit to 40 ħωc above, where ωc is the cyclotron frequency, for magnetic fields of 10, 17, 25, 32, 40 and 47 kG. At...

The practice of using the direct ionization radiation (electrons, protons, antiprotons, pions, ions, etc) or of the indirect ionization radiation (photons, neutrons, etc) in economy and social life has led to the introduction of the absorbed dose magnitude (ICRU 1953) defined as the energy absorbed per mass unit of the irradiated substance. This is a fundamental magnitude valid for any type of ...

We present new measurements of the perturber induced shift of the CH3I ionization energy at low perturber number densities and analyze these data within the local Wigner-Seitz model previously used at high density. We compare the local Wigner-Seitz model with the scattering approach developed by Fermi, and modified by Alekseev and Sobel’man, and show that the local Wigner-Seitz model extends sm...

Please cite this article in press as: Novikov YN e fect. Microelectron Reliab (2009), doi:10.1016/j The charge transport mechanism in amorphous alumina, Al2O3, is investigated both theoretically and experimentally. We found that the experimental current–field–temperature dependencies can hardly be understood based on the commonly used Frenkel effect or the thermally-assisted tunneling model. In...