Advances in Photochemistry, Volume 18 by David H. Volman, George S. Hammond, Douglas C. Neckers

By David H. Volman, George S. Hammond, Douglas C. Neckers

A part of a continuous sequence which explores the frontiers of photochemical examine, this quantity includes reviews by means of specialists within the box who seriously learn current info.

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Additional resources for Advances in Photochemistry, Volume 18

Example text

The reaction is of combustion importance, as it contributes to the removal of N O in the RAPRENO, process, in which the cyclic trimer of cyanuric acid, (HOCN),, is added to combustion flue gases. Reaction (17) is believed to be responsible for the high levels of N z O observed in experimental RAPRENO, reactors [l55], and has been assumed to be the most likely pathway, with the formation of CO, being less favored owing to the 1-3 oxygen migration necessary following formation of the ON-NCO intermediate [1541.

The maximum mirror retardation per TIME-RESOLVED FTIR EMISSION STUDIES 25 scan, and hence spectral resolution, is limited severely by the very long data acquisition times necessary. Since there is a one-to-one correlation between zero crossings and data collection, the only temporal jitter is that introduced by the delay generator (- 100 ns). Even though fluctuations in the speed of the moving mirror do occur in the course of a scan of data collection, no uncertainties in the temporal resolution of the experiments are introduced because the zero crossings, laser pulse, and data acquisition are all tightly coupled in time.

HEARD mechanism considers the dissociation of acetylene in a trans-bent configuration; the departing H atom can impart a kick which acts either in the same direction or in the opposite direction to the initial acetylene rotation. The rotation of the C-C framework can be enhanced substantially or slowed to a point where the initial rotation changes direction and leaves the polyatomic fragment rotationally cool. Energy and angular momentum constraints sometimes prevent dissociation of the trans-bent acetylene (the state that is populated following absorption at 193 nm) in which the direction of the departing H atom would add significantly to the initial rotational energy.

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