Radiative recombination in rubidium

The rate coefficients for radiative recombination of Rb into individual ground and excited nl states (n<or=20, l<or=10), summed over l<n(n<or=10) and over all states, have been computed for the electron temperature range 500<or=T<or=6000K. Using the principle of detailed balance, photoionisation cross sections of Rb calculated in the framework of a single-electron model have been used. The evolution with n and l for given T, with T for given n and various l and with T of the total radiative recombination is analysed. The significant non-hydrogenic features for recombination are outlined. Comparisons are made with the results of the hydrogenic and kramers' models and with other results available for alkali atoms.