Some of the ways in which analyticity has been used in the past and might be used in the future to aid in performing calculations of atomic scattering amplitudes are summarized. Included are extrapolation methods, contour distortion techniques and the determination of resonance positions. '~Invited
The use of the R-matrix method in atomic calculations
โ Scribed by W.D. Robb
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 323 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0010-4655
No coin nor oath required. For personal study only.
โฆ Synopsis
A brief account is given of the applicability of the R-matrix method to the calculation of e -atom scattering cross sections, atomic polarizabilities and van der Waals coefficients, photoionization cross sections. nonlinear. optical harmonic coefficients. Born ionization cross sections and free --free transition processes. The current state of the computer codes is discussed.
๐ SIMILAR VOLUMES
In this short note we describe some of the problems we have encountered on implementing the R-matrix codes of Berrington et al. on the CRAY-I. In particular we consider the calculation of R-matrix angular integrals which as currently implemented are not vectorizable. Since this section of the code i