Das kinetische Verhalten von Benzylradikalen und die Oszillatorenstärke ihres Emissionsspektrums in einer Niederdruckentladung

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Abstract
Benzyl radicals are formed from toluene in a low pressure discharge. The discharge is operated with rectangular pulses (pulse width 5 -200 μsec, repetition rate 200 cps, amplitude 50 -700 mA). The disappearance of the radicals is measured by means of their absorption band at 3053 A. Under the conditions of the discharge the „lifetime“ of the radicals is about 10-3 sec. The results show, that they disappear due to recombination in the gasphase via two-body-collisions. The recombination coefficient decreases with increasing temperature. - The corrected lifetime of the emission of the benzyl radicals (elimination of concentration quenching) is 10-4 sec at 25°C. The oscillator strength, which is calculated from this value, is compared with theoretical calculations. The measured lifetime of the emission of several radicals, whose chemicals constitution is not yet known, lies between 10-5 and 10-4 sec.

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