The v(1) band system of H-CC-CN (cyanoacetylene)

The v(1) band system of cyanoacetylene (H-CC-CN) has been observed with an effective resolution of 0.006 cm(-1) v(1) = 3327.37085(3) cm(-1), B-1 = 0.15149762(2) cm(-1), D-1 = 1.8065(3) x 10(-8) cm(-1). Several hot bands from the states v(5) = 1, v(6) = 1, v(7) = 1, 2 (l = 0 and 2), 3 (l = 1 and 3), and 4 (l = 0 and 2), v(6) = v(7) = 1 (l = 0 and 2), and v(6) = 1 and v(7) = 2 (l = 3) have also been observed and analyzed. Many bands show strong local perturbations due to interactions with states which are combinations of the modes 4, 5, 6, and 7. These perturbing states are also described quantitatively, and rovibrational constants are given. (C) 1996 Academic Press, Inc.