Abstract

CO₂ lasers modulated with single sideband acoustooptic modulators¹ have been used for Stark tuned sub-Doppler infrared-infrared double resonance spectroscopy of the 10-μm bands of formaldoxime, CH₂NOH. Fourier transform and diode laser spectra of these bands have also been obtained. The observed double resonance signals show a wide range of behavior ranging from symmetric rotor type patterns to those showing the effects of molecular asymmetry. An investigation of the resolution limitations on the saturation signals imposed by the Stark cell optical system has been made. The data have been interpreted with the aid of a spectrum simulation program in which the effects of the modulation on the second derivative line shapes have been incorporated.² A de tailed comparison of intensity and line shape behavior has been made and an interesting variation of the dipole moment change has been found.

© 1986 Optical Society of America