We present distorted-wave cross sections for excitation of the A 'TI, a k, a' '2+, D 'A and d 3A states of CO by electrons in the 20 to 50 eV energy range. In these studies both the initial and final distorted waves are obtained in the static-exchange field of the ground electronic state. Differential and integral cross sections are presented and compared with available experimental data and wi...

Background: Understanding of the incident electron energy and angular distributions from clinical electron accelerators (linacs) is important for dosimetry and treatment planning. The most important goals of this study were to evaluate the energy fluence and angular distributions of electron beams from a Neptun 10PC linac using the Monte Carlo (MC) code. Materials and Methods: The lina...

The statistics of energy levels for a disordered conductor are considered in the critical energy window near the mobility edge. It is shown that, if critical wave functions are multifractal, the one-dimensional gas of levels on the energy axis is compressible, in the sense that the variance of the level number in an interval is 〈(δN)2〉 ∼ χ〈N〉 for 〈N〉 ≫ 1. The compressibility, χ = η/2d, is given...

We investigate the gap formation probability of the effective one dimensional gas model recently proposed for the energy level statistics for disordered solids at the mobility edge. It is found that in order to get the correct form for the gap probability of this model, the thermodynamic limit must be taken very carefully. † [email protected] †† [email protected] To appear in the In...

As we’ve discussed, to get the right density of states we should replace m by me . In addition, the energy that appears in the square root in the density of states really came from changing variables from momentum to energy. At the bottom of the conduction band, the electrons presumably have very little momentum. That is, the first state to be filled corresponds to an electron wave which is a s...

The origin of high background electron concentration (n) in InxGa1−xN alloys has been investigated. A shallow donor was identified as having an energy level (ED1) that decreases with x (ED1 = 16 meV at x = 0 and ED1 = 0 eV at x ∼ 0.5) and that crossover the conduction band at x ∼ 0.5. This shallow donor is believed to be the most probable cause of high n in InGaN. This understanding is consiste...

W. Jaskólski Instytut Fizyki, Uniwersytet Miko laja Kopernika, Grudzia̧dzka 5, 87-100 Toruń, Poland Abstract We have found that purely metallic carbon nanotubes consisting of a nanometer-size metallic island connected to another two metallic nanotubes by topological defects, may present discrete energy levels, thus behaving as metallic quantum dots. When there is a symmetry gap around the Fermi ...

We investigate the gap formation probability of the effective one dimensional gas model recently proposed for the energy level statistics for disordered solids at the mobility edge. It is found that in order to get the correct form for the gap probability of this model, the thermodynamic limit must be taken very carefully. † [email protected] †† [email protected] To appear in the In...