INFRARED-SPECTRUM OF OZONE IN THE 4600 AND 5300 CM(-1) REGIONS - HIGH-ORDER ACCIDENTAL RESONANCES THROUGH THE ANALYSIS OF NU(1)-NU(2)+3-NU(3)-NU(2), NU(1)+2-NU(2)+3-NU(3), AND 4-NU(1)+NU(3) BANDS(2)

The very weak bands nu(1) + 2 nu(2) + 3 nu(3) and 4 nu(1) + nu(3) of O -16(3) have been observed for the first time, using the Fourier transf orm spectrometer (FTS) of Reims and the usual experimental setup provi ding a large product p X l of approximately 38 Torr x 36 m. The upper levels of these A-type bands which are rather close in energy (they ap pear respectively at 5291.722 and 5307.790 cm(-1)) belong to two diffe rent sets of interacting polyads. To correctly reproduce the rotation- vibration energy levels and account for the observed perturbations, bo th bands are treated in a dyad approximation: the (123) state in the C oriolis resonance with the (330) state, and the (401) state in the Cor iolis resonance with the (024) state. The assignments of the rotation- vibration levels of the (123) state are confirmed by measurements of l ine positions of the hot band nu(1) + 2 nu(2) + 3 nu(3) - nu(2) which has also been observed for the first time. The fits are very satisfact ory: the r.m.s. deviation for 249 energy levels of the (123) state is 2.4 x 10(-3) cm(-1) and is 2.0 x 10(-3) cm(-1) for 266 levels of the ( 401) state. These r.m.s. are near experimental accuracy. Transition mo ments for the three observed bands are determined from measured line i ntensities. (C) 1997 Academic Press.