GLOBAL VIBRATION-ROTATION ANALYSIS IN ACETYLENE: $^{12}$CH$^{13}$CH

Abstract

All known vibration-rotation absorption lines of $^{12}$CH$^{13}$CH accessing levels up to 6750 cm$^{-1}$ were gathered from the lite-rature. 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 $N_{r}$ = 5$v_{1}$+3$v_{2}$+5$v_{3}$+$v_{4}$+$v_{5}$, 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 were included in the model. The results will be presented and discussed.