By C. H. Bamford
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Extra resources for Comprehensive Chemical Kinetics: Practice of Kinetics
General Electric Co. AH6,lOOO W Point sources. An advantageous alternative to the high-pressure lamp for quantitative work is the high-pressure point-source lamp'28,'29, having a longer lifetime and a bztter stability (Fig. 36). These involve a high-powered discharge in xenon, mercury or a mercury-xenon mixture at 20 atm. or more. The bulb-like design obviates the need for water cooling. Either a third electrode, to which a high voltage pulse is applied, or a special power supply for the two electrode model, is used to start the lamp.
From ref. 9. Other lamps Resonance lamps of the alkali metals, zinc and cadmium have been constructed. Laidler13' shows how Hg, Zn and Cd lamps may be put to very good use to place limits on bond energies and to determine the mechanisms of some photo-sensitised reactions. However, none of these lamps has been used extensively and have limited (or no) photochemical use. Intermittent radiation It might be useful at this point to consider a very important photochemical technique, that involving intermittent radiation.
104-111 50 EXPERIMENTAL METHODS FOR SLOW REACTIONS The rate of formation of some intermediate in steady illumination (RSJ is given by equation D‘ where A is a proportionality constant, I , is the light absorbed and 0 < IZ < 1. Since r is the ratio of dark to light periods, the fraction of the time that the light is on is l / ( r + l ) . e. At fast sector speeds, when the flash period is short compared to the life-time of the intermediates, the effective light intensity is I J ( r + 1) and Rfastis given by equation ( F ’ ) : When n = 112 and r = 3 , B = 1/4 and C = 1/2.