EMMANUEL I. OBI AND GARY E. DOUBERLY, Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA.
The weakly bound complexes X-O3 (X=OH, C2H4) have been isolated in helium nanodroplets and probed with infrared laser spectroscopy. Measurements are carried out in the high frequency OH/CH stretch region (2900-3600 cm-1) and in the OOO symmetric and antisymmetric stretch region near 1050 cm-1. Many of the observed bands exhibit rotational fine structure, allowing for structural assignments via Stark spectroscopy. Rotationally resolved vibrational bands of the OH-O3 complex indicate a rather weak interaction, as the orbital angular momentum of the unpaired electron is unquenched and remains strongly coupled to the OH bond axis.