The rotationally resolved spectrum of the B2Π−X2Πelectronic origin
band transition of 13C6​H is presented. The spectrum is recorded using
cavity ring-down spectroscopy in combination with supersonic plasma jets by
discharging a 13C2​H2​/He/Ar gas mixture. A detailed analysis of more
than a hundred fully-resolved transitions allows for an accurate determination
of the spectroscopic parameters for both the ground and electronically excited
state of 13C6​H.Comment: 4 pages, 1 figure, 2 table