Electron-impact state-to-state resolved cross sections and rate coefficients for theX(v) →A(v′) excitation in BeH molecules

Electron-impact cross sections are calculated for the v → v ' transitions occurring between the vibrational levels of the two X 2 Σ + and A 2 Π electronic states of the BeH molecule. The calculations are performed with the R -matrix method for a purely vertical electronic transition for energies from threshold to 15 eV, and by using a modified version of the Mott and Masssey approximation to extend the calculations to high energies and to vibrational excitations. Rate coefficients are also calculated for the same transitions. The calculated v – v ' selective cross sections and rate coefficients both satisfy distinct scaling relationships, which can be represented in a simple analytic form.