A fast and compact compilep/interpreter for SPITBOL (a variant of SNOBOL4) has been written in a machine-independent macro assembly language and implemented initially on the ICL 1900 range of computers. The interpreter uses a novel form of indirect polish code which assists portability. Compile-time pre-evaluation of constant expressions has proved to be a worthwhile optimization. A description is given in some detail of the simple but rapid scheme, requiring no marker bits, employed for garbage collection.
Electron spin resonance spectra have been observed from paramagnetic species present in yirradiated n-hexadecene-1 between -196°C and O"C, and in n-hexadecane between -196°C and 14°C. The rate of production of trapped radicals in n-hexadecene-1 at -196°C is approximately 3.5 radicals/100 eV absorbed energy. Possible interpretations of the spectra are discussed in relation to the radiation chemistry of the system.The main purpose of this investigation was t o identify some of the intermediates formed when n-hexadecene-1 is irradiated with y-rays and t o establish their role in the radiation chemistry of the compound.1 In order to assist the identification of these intermediates, n-hexadecane was similarly irradiated. The conditions under which reliable estimates of concentration of trapped radicals can be made from electron spin resonance data were examined so that the signscance of these intermediates in the radiolysis could be more clearly established.
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