A cooled multipass cell for the absorption study of atmospheric compounds

A 5 m multipass cell has been designed for absorption measurements concerned with atmospheric compounds. It can operate in a temperature range down to 215 K and the optics have been chosen for studies in the ultraviolet spectral region. Measurements have been made with path lengths up to 160 m between 195 and 310 nm at ambient temperature, at 240 and 220 K.