The Millimeter- and Submillimeter-Wave Spectrum ofGauche-Ethyl Alcohol

✍ Scribed by J.C. Pearson; K.V.L.N. Sastry; Eric Herbst; Frank C. De Lucia

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 701 KB
• Volume: 175
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1996.0030

✦ Synopsis

We report an investigation of the rotational-torsional spectrum of the gauche rotational isomers of ethyl alcohol in the 51-505 GHz frequency region. Over a thousand transitions between rotational levels in the gauche substates of the ground OH torsional state have been measured and assigned. These transitions involve rotational quantum numbers J and K a up to 30 and 15, respectively, and are of two types: a-type transitions between levels in either the gauche/ or the gauche0 substate, and c-type transitions between rotational levels in the different substates. The majority of these transitions have been fit satisfactorily using a two-state Hamiltonian based on the fixed framework axis method (FFAM). The rotation, distortion, and interaction constants have been determined along with the energy difference between the two gauche substates. The derived constants can be used to predict many more transitions accurately for astronomical purposes. The J and K a region where the two-state analysis can be used has been determined. The basis for a threestate analysis including the trans substate is presented and the applicability of the FFAM approach is discussed.