ICLAS of 12C2H2 between 10140 and 10 600 cm-1

The absorption spectrum of (C2H2)-C-12 has been recorded by intracavity laser absorption spectroscopy (ICLAS) in the spectral region 10 140-10600 cm(-1), where three absorption bands were previously observed by Fourier transform spectroscopy. Thirteen bands starting, from the vibrational ground state could be detected and rotationally analyzed. All corresponding excited vibrational levels could be assigned using the polyad model (M. I. El Idrissi, J. Lievin, A. Campargue, and M. Herman, J. Chem, Phys. 110, 2074-2086 (1999)). The assignment procedure is detailed and relative intensity features are discussed. (C) 2002 Elsevier Science (USA).