Visible absorptions of potential diffuse ISM hydrocarbons: C${}_9$H${}_9$ and C${}_9$H${}_5$ radicals

Mathias Steglich, Surajit Maity, John P. Maier

The laboratory detection of previously unobserved resonance-stabilized C${}_9$H${}_5$ and C${}_9$H${}_9$ radicals in the supersonic expansion of a hydrocarbon discharge source is reported.…