By David H. Volman, George S. Hammond, Douglas C. Neckers
A part of a continuous sequence which explores the frontiers of photochemical learn, this quantity includes reviews through specialists within the box who severely examine latest information.
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Extra info for Advances in Photochemistry, Volume 18
A delay of 7 p s and a pressure of 1 mTorr ensured collision-free conditions, and the CCH radical was found to be rotationally colder (225 K) than the parent acetylene (300 K). One mechanism for rotational cooling comes about from the loss of angular momentum due to the departing H atom from an initially rotating acetylene. Although the H atom is light compared to the C-C framework, its departure can account for the cooling if the molecule remains linear. A second 36 G . HANCOCK AND D. E. 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.
It is ' 30 G . HANCOCK AND D. E. HEARD doubtful, even with a larger mirror travel, that higher resolutions could be obtained with such a simple S S instrument because of the problem of keeping the mirror absolutely stationary during data acquisition over the entire scan. Rotational resolution of hydride molecules was readily demonstrated with this instrument, but individual rotational lines of CO and CO, could not be distinguished. The majority of studies observed IR emission from atomradical reactions in a discharge-flow system at a pressure of several Torr [38, 40, 82, 83).
Plot of the relative vibrational populations of CO produced in the 0 + CHF reaction on a logarithmic scale obtained from the fit shown in Figure 16 (a), with the error bars showing one standard deviation obtained from the fitting routine. (---)results of Lin and co-workers  with both sets of experimental data equated at v = 1. 2: 1 as discussed in the text, with the prior populations summed to the same total CO population as in the experimental data. Reproduced with permission from Ref. 40.
Advances in Photochemistry, Volume 18 by David H. Volman, George S. Hammond, Douglas C. Neckers