By David H. Volman, George S. Hammond, Douglas C. Neckers
A part of a continual sequence which explores the frontiers of photochemical learn, this quantity includes reviews through specialists within the box who severely study current info.
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Additional resources for Advances in Photochemistry, Volume 18
The pulse repetition rate of the photolysis laser is determined by the velocity of the moving mirror, and the interferogram is composed of data points which have all been collected at the same delay time (= t l - t z )after the laser pulse. Reproduced with permission from Ref. 48. from 1 to 160 ,us after the excimer pulse. Cooled interference filters are used to eliminate some of the blackbody radiation falling onto the detector. After the raw spectrum is obtained, the background blackbody emission, measured by taking a spectrum while no precursor molecules are flowing, is subtracted.
The fluence dependence of the excitation of CF,HCl would be markedly different from that for production of CF,, and this rules it out as a source of the CO, emission. With the time dependence of the emission spectrum thus established by the SS FTIR instrument, kinetic measurements were then carried out using a series of narrow band interference filters, whose transmitted wavenumber ranges 50 G . HANCOCK A N D D. E. HEARD encompass the spectral features shown in Figure 19. The temporal behavior was identical to that observed at a given wavenumber from FTIR measurements (see Figure 22) but was achieved in a far shorter acquisition time.
If a large number of coadditions is required for adequate SNR, the time required for a complete experiment can become prohibitive. However, this method does allow time-resolved data to be taken at sensible laser repetition rates and stable scanning speeds, and with transients that decay only after many zero crossings. The data points for a given delay time are spread throughout the series of interferograms, and clearly a sorting of the data is required to generate complete interferograms which correspond to a common time after photolysis.
Advances in Photochemistry, Volume 18 by David H. Volman, George S. Hammond, Douglas C. Neckers