Negative ENDOR study of an x-ray irradiated crystal of N-acetylglycine

Abstract

The negative ENDOR technique was used to study an x‐ray irradiated crystal of N‐acetylglycine at room temperature. Within the 8–25 MHz frequency range, signals from at least 13 different types of protons were detected. This is in sharp contrast to the case of a conventional ENDOR technique, which detected a signal from only one type, in addition to a broad signal which was difficult to interpret. It was shown that the proton from the ruptured C–H bond is trapped in the immediate vicinity of the damaged molecule. It was also shown that the wavefunction of the paramagnetic electron extends significantly over the neighboring molecules.