  We explore the optical dipole orientation of single photon emitters in
monolayer MoS2 as produced by a focused helium ion beam. The single photon
emitters can be understood as single sulfur vacancies. The corresponding
far-field luminescence spectra reveal several photoluminescence lines below the
dominating luminescence of the exciton in MoS2. These sub-bandgap emission
lines were predicted by ab initio theory, but they have never been resolved in
luminescence experiments because of their small amplitude. We reveal the lines
by their dependence as a function of the photon energy and momentum as measured
in the back focal plane of the optical circuitry. The agreement between theory
and experiment suggests that the defect states interact strongly within the
Brillouin zone.
