Abstract: We have considered the ESR cavity as a photo-chemical reactor under various flow and temperature conditions.Our model system under investigation is the kinetic studies of alkyl nitrites in alcohol media.Various di-hydroxyalkyl and alkoxy-alkyl nitroxide free radial were formed and characterized by their ESR spectra.Of particular interests are the unequivocal detection of enantiomeric di-hydroxylethyl nitroxide radicals and other alkyl-alkoxyl nitroxide radicals. The determination of their conformations has been in terms of vibronic interactions and we find,from the standard valence theory,bond lengths and bond angles,the strong evidence for the intramolecular hydrogen bond formation in these nitroxide radicals,which may be of greater greater importance in other areas of science,such as biochemistry,biology and medicine.

Key words: Organic radical, Photochemical reaction, ESR, Asymmetric radical