Infrared–infrared double-resonance spectroscopy of formaldoxime and other molecules used in optically pumped gas lasers: asymmetry and line-shape effects

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Abstract
A microcomputer-controlled Stark spectrometer suitable for sub-Doppler infrared–infrared double-resonance experiments is described. The spectrometer may be used with acousto-optically modulated conventional low-pressure CO2 lasers or with the high-pressure waveguide versions, the latter providing a significant extension of the technique. A method of spectrum simulation has also been developed in which the effects of modulation on the second-derivative line shapes has been incorporated. Three examples of the use of these methods are given, the study of the effects of cell geometry on the line shapes and linewidths of double-resonance signals of fully deuterated formic acid (DCOOD), the analysis of the shapes of an asymmetric and an M-resolved spectrum that are observed using formaldoxime, and the identification of the pump transitions of optically pumped submillimeter laser lines in CH3F, CD3F, and CH3OH.