  We use the $R$-matrix with time-dependence method to study detachment from
F$^-$ in circularly-polarized laser fields of infrared wavelength. By
decomposing the photoelectron momentum distribution into separate contributions
from detached $2p_1$ and $2p_{-1}$ electrons, we demonstrate that the
detachment yield is distributed asymmetrically with respect to these initial
orbitals. We observe the well-known preference for strong-field detachment of
electrons that are initially counter-rotating relative to the field, and
calculate the variation in this preference as a function of photoelectron
energy. The wavelengths used in this work provide natural grounds for
comparison between our calculations and the predictions of analytical
approaches tailored for the strong-field regime. In particular, we compare the
ratio of counter-rotating electrons to corotating electrons as a function of
photoelectron energy. We carry out this comparison at two wavelengths, and
observe good qualitative agreement between the analytical predictions and our
numerical results.
