The rotationally resolved A (2)Pi (u) <-- X (2)<Pi>(g) electronic origin band spectrum of tetraacetylene cation (HC8H+) and its deuterated derivative (DC8D+) has been recorded in the gas phase, applying both frequency modulation spectroscopy in a liquid nitrogen cooled hollow cathode discharge and cavity ringdown spectroscopy in a supersonic planar plasma. The combined analysis of the rotational structure yields accurate molecular constants for the ground and electronically excited states as well as information on the molecular geometry. (C) 2000 Elsevier Science B.V. All rights reserved.
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Allan M., 1976, Chemical Physics Letters, V41, P228, DOI 10.1016/0009-2614(76)80798-1