Knowledge Bank

Trimethylene oxide and trimethylene sulfide have been studied to reassess the precision and accuracy available from microwave relative intensity measurements in view of recent theoretical and instrumental developments in this area. These molecules are excellent test cases since they possess a number of suitable excited vibrational states of known energy with rotational transitions covering a wide range of microwave frequencies. Data obtained from an investigation of rotational transition relative intensities in these and other compounds will be presented and, where possible, compared to previously reported far-infrared results.