Detection of extragalactic CF+ toward PKS1830-211 -- Chemical
  differentiation in the absorbing gas
  We report the first extragalactic detection of CF+, the fluoromethylidynium
ion, in the z=0.89 absorber toward PKS1830-211. We estimate an abundance of
~3E-10 relative to H2 and that ~1% of fluorine is captured in CF+. The
absorption line profile of CF+ is found to be markedly different from that of
other species observed within the same tuning, and is notably anti-correlated
with CH3OH. On the other hand, the CF+ profile resembles that of [C I]. Our
results are consistent with expected fluorine chemistry and point to chemical
differentiation in the column of absorbing gas.
