Abstract

A new absorption cell interfaced with a Bomem DA3.002 Fourier transform spectrometer has recently been put into operation. It is 5 m long and is capable of paths of up to 200 m at temperatures as low as 20 K. Compared to its 3.5m long predecessor,¹,² it gives longer paths, and, more importantly, has a larger optical aperture (f/25 vs. f/55). The result is improved sensitivity and the capability of higher spectral resolution. The enhanced throughput enables much better performance in the difficult "far" infrared region below the cutoff (≈ 1800 cm^-1) of the InSb detector.

© 1995 Optical Society of America