The convergent close-coupling method is applied to the calculation of fully differential cross sections for ionization of atomic hydrogen by 15.6 eV electrons. We find that even at this low energy the method is able to yield predictive results with small uncertainty. As a consequence, we suspect that the experimental normalization at this energy is approximately a factor of two too high. PACS n...

Small electrostatic fields of values not strong enough to activate electron impact ionization, attachment, and detachment processes can be established in the upper atmosphere by underlying thunderstorms. This paper investigates their effects on the ionospheric densities by using a simplified ion chemistry model. The modeling results indicate that under the steady state condition, the nighttime ...

GaAs PHEMTs are broadly used in RF power applications for wireless systems. A major concern with these devices is their gradual degradation as a result of prolonged biasing at high voltages. Previous research has identified the drain side of the device as the region that sustains most of the damage [1], but other mechanisms involving charge modulation under the gate [2] have also been reported....

Abstract. Application of the convergent close-coupling (CCC) method to electronimpact ionization of the ground state of atomic hydrogen is considered at incident energies of 15.6, 17.6, 20, 25, 27.2, 30, 54.4, 150 and 250 eV. Total through to fully differential cross sections are presented. Following the analysis of Stelbovics [submitted to Phys. Rev. Lett. (http://xxx.lanl.gov/abs/physics/9905...

The photodissociation dynamics of propyne and allene are investigated in two molecular beam/ photodissociation instruments, one using electron impact ionization and the other using tunable vacuum ultraviolet ~VUV! light to photoionize the photoproducts. The primary dissociation channels for both reactants are C3H31H and C3H21H2. Measurement of the photoionization efficiency curves on the VUV in...

Electrical conductivity of a highly boron doped chemical vapor deposited diamond thin film has been studied at different temperatures under high electric field conditions. Current-voltage characteristics have been measured using pulsed technique to reduce thermal effects. Experimental results evidence deep impurity impact ionization avalanche in p-type diamond up to room temperature.

With the rapid feature size reduction of modern semiconductor devices accurate description of hot-carrier phenomena is becoming very important. Frequently used carrier transport models are the traditional drift-diffusion model and energytransport models which also consider the average carrier energy as an independent solution variable. Recent results show, however, that the average energy is in...

We study elastic scattering and impact ionization by returning electrons induced in a strong laser field based on the recently developed quantitative rescattering theory. The high-energy angle-resolved photoelectron spectra of molecules in strong fields are attributed to elastic scattering of the returning electrons with the parent ion. We demonstrate that the high-energy photoelectron spectra ...

The electron impact ionization cross section of H2 is calculated using a distortedwave approximation. The calculated cross section is compared to the experimental results of Peart and Dolder. The simplicity of the system allows an assessment of the accuracy of the distorted-wave approximation without complications from inaccuracies in the target state, initial continuum state, or final continuu...

Tien-Yow Kuo and Keh-Ning Huang Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung, Taiwan 202, Republic of China Department of Physics, National Taiwan University, Taipei, Taiwan 106, Republic of China Institute of Atomic and Molecular Sciences, Academia Sinica, P. O. Box 23-166, Taipei, Taiwan 106, Republic of China ~Received 5 February 2001; published 17 August 2...