![]() "Bremmer series, R-matrix propagation algorithm, and numerical modeling of diffraction gratings". Journal of Nonlinear Mathematical Physics. The user-friendly software Quantemol Electron Collisions (Quantemol-EC) and its predecessor Quantemol-N are based on UKRmol/UKRmol+ and employ MOLPRO package for electron configuration calculations. R-matrix method is used in UKRmol and UKRmol+ code suits. This approach was later adapted for electron, positron and photon scattering by molecules. ![]() Using that work as a basis, an R-matrix method was developed for electron, positron and photon scattering by atoms. ![]() This method was originally formulated for studying resonances in nuclear scattering by Wigner and Eisenbud. There is a method in computational quantum mechanics for studying scattering known as the R-matrix. The numerical modeling of diffraction gratings in optical science can be performed using the R-matrix propagation algorithm. In quasitriangular Hopf algebra, the R-matrix is a solution of the Yang–Baxter equation. The classical R-matrix arises in the definition of the classical Yang–Baxter equation. This is an equation which was first introduced in the field of statistical mechanics, taking its name from independent work of C. ![]() The term R-matrix is used in connection with the Yang–Baxter equation. The term R-matrix has several meanings, depending on the field of study.
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