  Using x-ray photoelectron diffraction (XPD) and angle-resolved photoemission
spectroscopy, we study photoemission intensity changes related to changes in
the geometric and electronic structure in the kagome metal CsV$_3$Sb$_5$ upon
transition to an unconventional charge density wave (CDW) state. The XPD
patterns reveal the presence of a chiral atomic structure in the CDW phase.
Furthermore, using circularly polarized x-rays, we have found a pronounced
non-trivial circular dichroism in the angular distribution of the valence band
photoemission in the CDW phase, indicating a chirality of the electronic
structure. This observation is consistent with the proposed orbital loop
current order. In view of a negligible spontaneous Kerr signal in recent
magneto-optical studies, the results suggest an antiferromagnetic coupling of
the orbital magnetic moments along the $c$-axis. While the inherent structural
chirality may also induce circular dichroism, the observed asymmetry values
seem to be too large in the case of the weak structural distortions caused by
the CDW.
