First Observation of thev2= 3 State of Ozone: The (131) State Through Analysis of Cold and Hot Bands

Abstract

The vibration–rotation energy levels of the (131) state of ozone have been obtained, covering the whole range ofJup to 33 andKaup to 9, from the analysis of the hot band, observed for the first time ν1+ 3ν2+ ν3− ν2in the 3400 cm−1region. The assignments have been confirmed by the analysis of the cold band ν1+ 3ν2+ ν3recorded in the 4100 cm−1region. This enabled us also to derive the transition moment ϕz000–131= 1.8 × 10−4D. The analysis has been performed using single state Watson's Hamiltonian where the 164 levels are fitted with 10 parameters with a r.m.s. deviation of 1.9 × 10−3cm−1, near the experimental accuracy. Note that the analysis involving simultaneously three interacting states of the Triad {(230), (131), (032)} has also been performed which however did not result in an improvement of the r.m.s. deviation of the fit. This work allows us to observe a quasilinear variation ofA(1v21),B(1v21) +C(1v21) and ΔK(1v21) with respect tov2. This result is of first importance to derive band centers of perturbing levels involvingv2≥ 3.