Instrument Home GPS Home Caltech Home	Spectroscopic Studies of Atmospheric Reactions   Prof. Wennberg's lab contains (left part of bench) a high repetition rate Nd:YAG laser-pumped dye laser used to produce UV photons for laser induced fluorescence detection of the hydroxyl radical (OH).  On the right of the optical bench is a high resolution FTIR (0.1 cm-1 resolution) for quantifying concentrations of both analytes and impurities in the synthesis of the compounds under study (e.g. HNO4).   Flow cell for conducting studies of the photochemistry of compounds relevant to atmospheric chemistry. At the near end of the picture is the where OH radicals are detected.   Small amount of OH is produced via thermal dissociation of ambient H2O on a glowing NiChrome filament.   Top view of the OH Laser-Induced Fluorescence system. back to top | Instrument Home | GPS Home | Caltech Home