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 Title: Rotational Spectrum Of So3 And Theoretical Evidence For The Formation Of Rotational Energy Level Clusters In Its Vibrational Ground State Author(s): Jensen, Per Contributor(s): Tennyson, Jonathan; Yurchenko, Sergei N.; Underwood, Daniel S Subject(s): Theory and Computation Abstract: The structure of the purely rotational spectrum of sulphur trioxide $SO_3$ is investigated using a new synthetic line list. The list combines line positions from an empirical model with line intensities determined, in the form of Einstein coefficients, from variationally computed ro-vibrational wavefunctions in conjunction with an \textit{ab initio} dipole moment surface. The empirical model providing the line positions involves an effective, Watsonian-type rotational Hamiltonian with literature parameter values resulting from least-squares fittings to observed transition frequencies. The formation of so-called rotational energy clusters at high rotational excitation are investigated. The SO$_3$ molecule is planar at equilibrium and exhibits a unique type of rotational-energy clustering associated with unusual stabilization axes perpendicular to the S--O bonds. This behaviour is characterized theoretically in the $J$ range from 100 through 250. The wavefunctions for these cluster states are analysed, and the results are compared to those of a classical analysis in terms of the rotational-energy-surface formalism. Issue Date: 2014-06-19 Publisher: International Symposium on Molecular Spectroscopy Citation Info: Jensen, P.; Tennyson, J.; Yurchenko, S.N.; Underwood, D.S. ROTATIONAL SPECTRUM OF SO3 AND THEORETICAL EVIDENCE FOR THE FORMATION OF ROTATIONAL ENERGY LEVEL CLUSTERS IN ITS VIBRATIONAL GROUND STATE. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.RC06 Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/50991 DOI: 10.15278/isms.2014.RC06 Rights Information: Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/ Date Available in IDEALS: 2014-09-172015-04-14
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