Excitation and Recombination Data for Nd I–V with Applications to Kilonovae

This dataset contains electron-ion collion data for low-charge neodymium ions calculated using AUTOSTRUCTURE. The data are provided in standard ADAS formats (https://open.adas.ac.uk) for use in collisional-radiative and plasma modelling. The ADF04 files contain Maxwellian-averaged effective collision strengths, (Upsilon(T)), for electron-impact excitation of the neodymium ions. The underlying direct-excitation collision strengths were calculated using the distorted-wave method in AUTOSTRUCTURE and subsequently averaged over a Maxwellian electron-energy distribution. These files contain the direct excitation (DE) contribution only, without resonant enhancement. The ADF04 (DE+RE) files contain effective collision strengths, (\Upsilon(T)), including both direct excitation (DE) and resonant excitation (RE) contributions. The DE component is obtained from distorted-wave calculations, while the RE contribution accounts for excitation through dielectronic capture into intermediate autoionizing states followed by autoionization into an excited state of the target ion. The combined files therefore include the resonant enhancement of the Maxwellian-averaged excitation data. The ADF09 files contain dielectronic recombination (DR) data calculated using AUTOSTRUCTURE and processed into the standard ADAS adf09 format. The files provide temperature-dependent, state-resolved DR rate coefficients suitable for use in ADAS collisional-radiative modelling. The NdII.rm is the adf04 file from the DARC excitation calculation.