# FURTHER STUDIES OF THE PERCHLORIC ACID ROTATIONAL SPECTRUM

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 Title: FURTHER STUDIES OF THE PERCHLORIC ACID ROTATIONAL SPECTRUM Creators: Cohen, E. A.; Oh, J. J.; Drouin, Brian J. Issue Date: 2001 Publisher: Ohio State University Abstract: $HClO_{4}$ is a nearly spherical rotor with a moderately low 3-fold barrier to internal rotation, $(s \approx 5.15)$. The a molecular axis is nearly coincident with the internal rotation axis of the OH and $ClO_{3}$ groups. Only A torsional states are allowed. The rotational energies are dominated by the K dependent solutions of the Mathieu equation and have little resemblance to those of a normal asymmetric rotor. For the $HClO_{4}$ ground torsional state, more than 700 features between 52 and 645 GHz with $J \leq 61$ and $K \leq 47$ of the two major isotopic species have been assigned and fitted. Because of the unusual distribution of energy levels, these include many perturbation enhanced transitions involving large changes in the K quantum number. Low lying excited torsional state spectra also have been assigned. Details of the fitting will be shown. The molecular parameters, which include rotational, centrifugal distortion, quadrupole coupling, torsion-rotation interaction constants and the barrier to internal rotation, will be presented. Structural implications will be discussed. [FIGURE] Description: $^{a}$Present address: Department of Chemistry, SookMyung Women's University, Seoul, Korea Author Institution: California Institute of Technology; Jet Propulsion Laboratory, California Institute of Technology URI: http://hdl.handle.net/1811/20255 Other Identifiers: 2001-TG-07