dc.creator Groner, P. en_US dc.creator Unrath, M. en_US dc.creator Christen, D. en_US dc.date.accessioned 2010-07-12T13:57:31Z dc.date.available 2010-07-12T13:57:31Z dc.date.issued 2010 en_US dc.identifier 2010-RH-13 en_US dc.identifier.uri http://hdl.handle.net/1811/46126 dc.description Author Institution: Department of Chemistry, University of Missouri-Kansas City, Kansas City, MO 64110-2499; Institute of Physical and Theoretical Chemistry, University of Tubingen, D-72076 Tubingen, Germany en_US dc.description.abstract The first assignments of rotational transitions of acetone in the ${\nu}_{17}$ state, based on a study of the mm/sub-mm wave spectrum, were published two years ago. Over 700 frequencies of transitions from all four torsional substates ($AA$, $EE$, $AE$, and $EA$) have been assigned; over 600 have been fit to an effective rotational Hamiltonian for molecules with two internal rotors. However, the fit was not very good (standard deviation 0.48 MHz) and required a large number of ill-determined parameters, some of which were clearly outside the expected range. A search for transitions at lower frequencies by microwave-microwave double resonance has been moderately successful. So far, 12 double resonances involving 6 pump and 8 signal transitions have been found that connect 15 energy levels ($1 &lt; J &lt; 6$) in the $EE$ torsional substate. These frequencies were found within a range of up to seven times the predicted standard errors. The newly assigned transitions were used in least-squares fits together with all previously assigned transitions (or subsets thereof) in an effort to determine more sensible parameters and to achieve more stable fits. We are hoping to assign more transitions, specifically transitions in the $AA$ torsional substate. en_US dc.language.iso en en_US dc.publisher Ohio State University en_US dc.title FIRST MICROWAVE TRANSITIONS IN THE ROTATIONAL SPECTRUM OF ${\nu}_{17}$ OF ACETONE ASSIGNED BY MW-MW DOUBLE RESONANCE en_US dc.type Article en_US
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