REMPI SPECTRA OF I2 - THE [2-PI-3 2]C5D 1G RYDBERG STATE AND INTERACTIONS WITH ION-PAIR STATES/

Rotational contours of the (2+1) REMPI spectra of iodine due to resona nce excitation to the [2PI3/2]c5d; 1 g Rydberg state have been recorde d at room temperature. Rotational parameters, B(v)BAR were estimated f rom the band-head structure and used to derive the band origin by spec tral simulations. T(e) = 59683.9 +/- 1.5 cm-1 and omega(e) = 248.5 +/- 0.6 cm-1 were obtained from vibrational analyses. Several anomalies o bserved in the vibrational and band-head structures are discussed and interpreted as being due to the homogeneous interaction between the Ry dberg state and the beta(1g) ion pair state.