The rotational spectrum of acetone: Internal rotation and centrifugal distortion analysis

Abstract

In the rotational spectrum of acetone, 52 new quartets (up to 300 GHz, J≤30) have been measured. Because the barrier hindering internal rotation is low ( s = 21), a new computer program based on the Internal Axis Method has been developed. It has allowed us to satisfactorily fit the spectrum and to accurately determine the rotational constants, centrifugal distortion constants, and the three internal rotation parameters.