Theory of inner-shell photoionization of fixed-in-space molecules

A theory is presented for the calculation of molecular inner-shell photoionization near thresholds and electron--molecular-ion elastic scattering. The interaction of the incoming/outgoing electron with each atom of the formation (except for the ionized atom) is accounted for by suitable boundary conditions imposed on the electron wave function at nuclei of these atoms in the system. The theory is applied to calculations of the form of the photoelectron angular distribution for $1s$ photoionization of the C atom in the CO diatomic molecule, as well as for the photoelectron angular distribution due to photodetachment from a quasimolecular negative ion consisting of a ${\mathrm{C}}^{\ensuremath{-}}$ ion located near a neutral O atom.

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