A new interpretation of the IR spectrum of H(D)Cl complexed with dimethyl ether from a supersonic jet-FTIR experiment

FTIR spectra of the upsilon(s) bands of HCl and DCl complexed by dimethylether in a supersonic jet expansion seeded with argon have been recorded using a new experimental set-up which significantly improves our previous data [Chem. Phys Lett. 268 (1997) 265]. The temperature effects introduced in the experiments coupled to jet-cooled conditions (< 50 K) facilitate the band assignments and enable some parameters relative to these complexes to be estimated with the theoretical support of density functional calculations. From this analysis a new interpretation of the band shaping mechanisms for the gas cell spectra of both DME:HCl and DME:DCl dimers, which emphasizes the role played by the transitions involving the low frequency intermolecular bending modes upsilon(delta), is proposed. (C) 1999 Published by Elsevier Science B.V. All rights reserved.