Knowledge Bank

The analysis of infrared microwave sideband laser spectra of the $v2$ band of $D2CO$ at $1700cm-1$, for which a preliminary report was given at this meeting last year, has been completed with the determination of improved molecular constants for the $v2-1$ state. Approximately 150 transitions have been fit to a set of constants that can predict transitions for and to an absolute accuracy of approximately 10 MHz. The transitions for show evidence for a resonance. An infrared radio-frequeney double resonance effect has been observed by pumping an R-bend transition in the $\nu 2$ band of $H2CO$ with the Infeared microwave sideband laser system operating at fixed resonant frequency and recording the infrared transmission as a function of radio frequency. Double resonance effects were observed when the RF frequency coincided with the splittings of the connected asymmetry doublets.