Symmetric Top Molecules Introduction

From the chemical viewpoint, an interesting development was the introduction in 1965 of the electrostatic hexapole lens [24] for producing beams of oriented symmetric top molecules, suitable for use as reagents in crossed beam reactions. 

For an introduction into the revised structure of the tables in the present volume 1129, see 2.1.2, "List of tabulated rotational parameters" above. The parameters of a given molecule are listed separately for each isotopologue and each vibrational state. Within this gross order, the internal-rotation interaction constants are placed underneath the rotational parameters in columns 2 and 3, usually before the hfs parameters and external-field parameters. The following quantities extracted from the internal rotation fine stracture of symmetric-top molecular spectra can be found tabulated (See also the "List of tabulated asymmetric top internal-rotation parameters" in the next subvolume) ... 

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