Potentials for Weakly Bound States in I2 from Diffuse Spectra and Predissociation Data

摘要

Potential curves are derived for the 2431 1 Pi sub u and 2341 1 sub g 3 Pi states of I2 using existing data from several sources. Compared with previous estimates, the new potentials are thought to be valid over a wider range of internuclear distance, spanning the shallow bound wells at large R (>4A) and the repulsive regions where they cross the well-known B(O(+) sub u 3 Pi) state at small R (<3.3A). Seven of the ten Hund's case (c) molecular states which correlate with ground-state I atoms are now known experimentally, including three which cross the B state. The role of these states in the collisional quenching of B and in the geminate recombination of I atoms is considered. Keywords: Diffuse spectra predissocation; Internuclear collisional quenching; Reprints; Iodine.