THE ROTATIONAL SPECTRUM OF SINGLY AND DOUBLY $^{13}$C-SUBSTITUTED DIMETHYLETHER
Date
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Dimethylether (DME) is a nearly prolate asymmetric top with two internal rotors (methyl groups) which undergo periodic large amplitude motions and show a complicated torsional splitting of each rotational energy level. Due to its complex spectrum and its high abundance in hot cores such as Orion~KL or Sagittarius~B2 at temperatures exceeding 100~K, DME is very prominent in astronomical line surveys and contributes to spectral line confusion of such sources, \textit{Astrophys. J. Suppl. Ser.} \textbf{156}, 127-167 (2005)}. The interpretation of astronomical observations therefore depends on the knowledge of accurate rest frequencies and reliable intensities. Precise predictions for the ground state of DME's main isotopologue are now available up to 2.1~THz, \textit{Astronomy & Astrophysics} \textbf{504}, 635-640 (2009)}. %Several studies have been performed on various deuterated species of DME, for example by Blukis \textit{et al.} \textbf{38}, 2753-2760 (1963)}, Durig \textit{et al.} \textbf{62}, 159-174 (1976)}, and recently by Niide and Hayashi \textbf{220}, 65-79 (2003)}. In contrast, very little is known about
Description
Author Institution: I. Physikalisches Institut, Universitat zu Koln, 50937 Koln, Germany; Institut fur Anorganische Chemie, Universitat zu Koln, 50939 Koln, Germany