Vibration-rotation energy pattern in acetylene:: 13CH12CH up to 6750 cm-1

All known vibration-rotation absorption lines of (CHCH)-C-13-C-12 accessing levels up to 6750 cm(-1) were gathered from the literature. They were fitted simultaneously to J-dependent Hamiltonian matrices exploiting the well known vibrational polyad or cluster block diagonalization, in terms of the pseudo-quantum-numbers N-s=v(1)+v(2)+v(3) and N-r=5v(1)+3v(2)+5v(3)+v(4)+v(5), and accounting also for l parity and e/f symmetry properties. The anharmonic interaction coupling terms known to occur from a pure vibrational fit in this acetylene isotopologue [Robert , J. Chem. Phys. 123, 174302 (2005)] were included in the model. A total of 12 703 transitions accessing 158 different (v(1)v(2)v(3)v(4)v(5),l(4)l(5)) vibrational states was fitted with a dimensionless standard deviation of 0.99, leading to the determination of 216 vibration-rotation parameters. The experimental data included very weak vibration-rotation transitions accessing 18 previously unreported states, some of them forming Q branches with very irregular patterns.