Sabina Beninati

Study of vibrational interactions in DCO+ by millimeter-wave spectroscopy and determination of the equilibrium structure of the formyl ion

Rotational transitions of DCO+ in vibrationally excited states were measured in the region 360–440 GHz. The states investigated are: 0 2 0 (with l=0,2), 0 3 0 (with l=1,3), 0 4 0 (with l=0,2,4), 0 11 1, and 1 00 0. This study allowed us to carefully analyze the vibrational interaction affecting the first C–D stretching state 1 00 0, which was confirmed to be due to the 0 11 1 state. Taking account of the perturbation effect on the rotational constants of the involved states allowed to derive an accurate equilibrium structure of HCO+, which resulted to be rCH=1.092 04 A and rCO=1.105 58 A.

Adsorption of Paracetamol and Acetylsalicylic Acid onto Commercial Activated Carbons

The adsorption of paracetamol (PAR) and acetylsalicylic acid (ASA) onto high-surface-area, commercial activated carbons was investigated at 26°C via adsorption isotherms at different pH values, including pH 1.5 to simulate conditions existing in the stomach. A wide-ranging characterization of the carbons, including analysis of their morphology and surface chemistry, was undertaken, with the actual surface areas of the carbons available for PAR and ASA adsorption being estimated by taking the molecular sizes of the drugs into account. This provided an understanding of the differences in the drug adsorption behaviour of the carbons.