Infrared spectrum of the I--D-2 anion complex

摘要

The infrared spectrum of the I--D-2 anion complex is measured in the D-2 stretch region by monitoring production of I- photofragments. The rotationally resolved spectrum consists of two overlapping Sigma-Sigma subbands, redshifted by approximate to58 cm-1 from the free D-2 fundamental vibrational band. These subbands are associated with absorptions by I--D-2 complexes containing ortho and para forms of D-2. The measured rotational constants are consistent with a 3.79 Angstrom separation between I- and the D-2 center of mass, contracting by 0.08 A when the D-2 subunit is vibrationally excited. Spectroscopic data are used to generate effective radial potential energy curves describing the interaction of ortho and para D-2 with I- from which the dissociation energies of I--D-2(ortho) and I--D-2(para) are estimated as D-0=236 and 297 cm(-1), respectively. (C) 2004 American Institute of Physics.