First observation of the nu(2)=3 state of ozone: The (131) state through analysis of cold and hot bands - Study of nu(2) behavior

The vibration-rotation energy levels of the (131) state of ozone have been obtained, covering the whole range of J up to 33 and K-a up to 9, from the analysis of the hot band, observed for the first time nu(1) + 3 nu(2) + nu(3) - nu(2) in the 3400 cm(-1) region. The assignments have been confirmed by the analysis of the cold band nu(1) + 3 nu(2) + nu(3) recorded in the 4100 cm(-1) region. This enabled us also to derive the transition moment phi(z)(000-131) = 1.8 x 10(-4) D. 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 x 10(-3) cm(-1), near the experimental accuracy. Note that the analysis involving simultaneously three interacting states of the Triad {(230), (131), (032)} has also been preformed 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 of A(1 nu(2)l), B(1 nu(2)l) + C(1 nu(2)1) and Delta(K)(1 upsilon(2)1) with respect to upsilon(2). This result is of first importance to derive band centers of perturbing levels involving v(2) greater than or equal to 3. (C) 1997 Academic Press.