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 h ave 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 deri ve the transition moment phi(z)(000-131) = 1.8 x 10(-4) D. The analysi s 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 anal ysis involving simultaneously three interacting states of the Triad {( 230), (131), (032)} has also been preformed which however did not resu lt in an improvement of the r.m.s. deviation of the fit. This work all ows 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 perturbin g levels involving v(2) greater than or equal to 3. (C) 1997 Academic Press.