Medium effects of the lowest rydberg transitions of saturated amines

For the purpose of modelling medium effects on the lowest Rydberg transitions of amines, ab initio calculations on excited clusters of ammonia and helium were performed. As the excited state surface is strongly repulsive, shifts of the transitions to higher energies are reproduced. As charge is accumulated around the perturber atom, the spatial charge distribution is considerably altered. The diffuse character of the Rydberg orbitals is not principally changed after clustering.