Abstract
We evaluate the shake up process in the K-photoionisation of atomic
carbon, i.e. the 2s --> 2p and 3, and 2p --> 3p shake up excitations,
within the photon energy range 25 to 45 Ry. As in the atomic boron case,
the 2s --> 3s excitation is still relatively strong and due to
configuration interaction effects dominates the 2p subshell excitation
to 3p. The conjugate shake up 2s --> 2p is 3% near 45 Ry, decreasing
slowly as expected. This infers that the shake off process would lead
mostly to terms related to the configurations 1s2s2p(2) with a
percentage of about 20%.
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