We have calculated the total cross section for proton-impact ionization of atomic hydrogen for the intermediate energy range 25–100 keV. We evaluate error bars of 5% on our theoretical values. The present results disagree with the experiment of Shah and Gilbody @J. Phys. B 14, 2361 ~1981!# and Shah et al. @J. Phys. B 20, 2481 ~1987!#, differing by 20% at the peak of the ionization cross section...

The degradation of thin tunnel gate oxide under constant Fowler–Nordheim (FN) current stress was studied using flash EEPROM structures. The degradation is a strong function of the amount of injected charge density (Qinj), oxide thickness, and the direction of stress. Positive charge trapping is usually dominant at low Qinj followed by negative charge trapping at high Qinj, causing a turnaround ...

When transparent solids are irradiated with laser intensities above a certain threshold, strong absorption of laser energy occurs. The increasing absorptivity is caused by the formation of a free electron gas in the conduction band of the dielectric. The temporal evolution of the free-electron density in a dielectric during ultrashort pulse laser irradiation plays a fundamental role for numerou...

In this article, we use Monte Carlo methods to study the interaction of high power laser pulses with electrons in the conduction band of semiconductors. The laser field is represented by a sinusoidal electric field which tends to cause an oscillatory motion in the electrons. The scattering of electrons from the lattice force the electrons to lose phase coherence with the field. The approach is ...

We have calculated cross sections for electron impact ionization (EII) of P-like Fe11+ forming Si-like Fe12+. We have used the flexible atomic code (FAC) and a distorted-wave (DW) approximation. Particular attention has been paid to the ionization through the 3l → nl′ and 2l → nl′ excitation autoionization (EA) channels. We compare our results to previously published FAC DW results and recent e...

Enhanced performances of 111-V field effects transistors are generally expected at cryogenic temperatures thanks to the better confinement and the velocity of carriers. An overview of our recent work on ultrashort gate-length HEMTs on GaAs and InP substrates at low temperature is presented in this paper. The compared behavior of the devices and the relative enhancement or degradation of their l...

Recent multi-photon ionization (MPI) experiments on uracil revealed a fragment ion at m/z 84 that was proposed as a potential marker for ring opening in the electronically excited neutral molecule. The present MPI measurements on deuterated uracil identify the fragment as C3H4N2O (uracil less CO), a plausible dissociative ionization product from the theoretically predicted open-ring isomer. Equ...

Submitted for the MAR08 Meeting of The American Physical Society Suppressing the fragmentation of fragile molecules in helium nanodroplets by co-embedding with water: Possible role of the electric dipole moment1 YANFEI REN, VITALY KRESIN, University of Southern California — When fragile molecules are embedded in liquid helium nanodroplets, electron-impact ionization usually leads to fragmentati...

We have carried out an experimental study exploring both impact ionization and electron transport in InAlAs/n+-InP HFET’s. Our devices show no signature of impact ionization in the gate current, which remains below 17 p ” m under typical bias conditions for L, = 0.8 pm devices (60 t i e s lower than for InAlASnnGaAs HEMT’s). The lack of impact ionization results in a drain-source breakdown volt...

Galileo was the first artificial satellite to orbit Jupiter. During its late orbital mission the spacecraft made two passages through the giant planet’s gossamer ring system. The impact-ionization dust detector on board successfully recorded dust impacts during both ring passages and provided the first in-situ measurements from a dusty planetary ring. During the first passage – on 5 November 20...