Access to the full text of the published version may require a subscription. Rights AbstractThe room temperature absorption spectrum of formaldehyde, H 2 CO, from 6547 to 6804 cm −1 (1527 to 1470 nm) is reported with a spectral resolution of 0.001 cm −1 . The spectrum was measured using cavity-enhanced absorption spectroscopy (CEAS) and absorption cross-sections were calculated after calibrating the system using known absorption lines of H 2 O and CO 2 . Several vibrational combination bands occur in this region and give rise to a congested spectrum with over 8000 lines observed. Pressure broadening coefficients in N 2 , O 2 , and H 2 CO are reported for an absorption line at 6780.871 cm −1 , and in N 2 for an absorption line at 6684.053 cm −1 .

A new closed gas-phase system with complex oscillatory behaviour is reported. Employing the pulsed cavity ring-down technique, the absorption of static naphthalene vapour buffered with a noble gas at room temperature was measured as a function of time at 650 nm after UV multi-photon laser photolysis at 308 nm. The absorption dynamics of the static (unstirred) system exhibits extraordinary periodic and complex oscillations with periods ranging from seconds to many minutes, persisting for up to 4 h. Depending on the buffer gas pressure, several types of dynamical responses can be generated.

No abstract