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The electronic energy loss of molecular clusters as a function of impact parameter is far less understood than  atomic energy losses. For instance, there are no analytical expressions for the energy loss as a function of  impact parameter for cluster ions. In this work, we describe two procedures to evaluate the combined energy  loss of molecules  Ab initio calculations within the semiclassical approximation and the coupled channels  method using atomic orbitals; and simplified models for the electronic cluster energy loss as a function of the  impact parameter, namely the molecular perturbative convolution approximation MPCA, an extension of the  corresponding atomic model PCA and the molecular unitary convolution approximation  MUCA, a molecular  extension of the previous unitary convolution approximation UCA . In this work, an improved ansatz for  MPCA is proposed, extending its validity for very compact clusters. For the simplified models, the physical  inputs are the oscillators strengths of the target atoms and the target electron density. The results from these  models applied to an atomic hydrogen target yield remarkable agreement with their corresponding ab initio  counterparts for different angles between cluster axis and velocity direction at specific energies of 150 and 300  keV

Impact-parameter dependence of the energy loss of fast molecular clusters in hydrogen