Fixed-molecule photoelectron angular distributions:K-shell cross sections of CO at fixed detection angles

Photoelectron angular distributions, doubly differential in target and detector orientation, are calculated for $K$-shell ionization of carbon and oxygen in CO at the $f$-wave shape resonance in the $\sigma (\lambda =0)$ channel (0.8-Ry kinetic energy). Dipole amplitudes are computed by the multiple-scattering formulation of inner-shell photoionization. Results are presented for several fixed-detector orientations and all possible target orientations for linearly, circularly, and naturally polarized light. Distributions are rich in structure because of the interplay of anisotropies in target and detector orientations, and serve to predict the complexity of measured distributions.