The apparatus show in Figure 1 is designed to observe infra-red spectra of molecules in supersonic beams using the Stark effect to tune molecular transitions into resonance with the lasing transitions of a frequency-stabilised carbon dioxide laser. The bolometer provides a signal proportional to the flux of molecules excited by the laser radiation. Collimation of the molecular beam is ± 150 microns, and the laser stability and electric field homogeneity are sufficient that transit time broadening determines the observed line width (WO = 3.4mm, H.W.H.M. = 100 KHZ). With this apparatus the effects of coherent excitation of IR transitions may be observed.

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