Quantification of nitric acid using photolysis induced fluorescence for use in chemical kinetic studies

Characterization of two photon excited fragment spectroscopy (TPEFS) for HNO3detection in gas-phase kinetic experiments

“…The apparent, negative offset is a manifestation of non-linearity at low laser energy where the first transition is not yet saturated. Our energy dependence contrasts that reported by Winiberg et al 17 who observed a quadratic dependence on laser fluence. This difference is likely related to their use of much lower laser fluences (factor B15) and (potentially) a less focused laser beam.…”

“…Indeed, this additional channel, in which the co-product would be OH in its electronic ground state, is energetically feasible and has been proposed previously. 36 Recent work by Winiberg et al 17 also showed that NO(A) was observed from the two photon photolysis of HNO 3 at 248 nm.…”

“…They used these findings to develop a new method (laser-photolysis fragmentfluorescence, LPFF) for the measurement of HNO 3 in the atmosphere. 15,16 Recently, Winiberg et al 17 reported results from the multi-photon photolysis of HNO 3 at 193 and 248 nm and reported dispersed OH and NO fluorescence spectra. They demonstrated that OH emission from a 2-photon excitation of HNO 3 was not only observed upon excitation at 193 nm but also at 248 nm.…”