ESR Investigation of a Stable Trapped Hydrogen Atom in X-ray-Irradiated beta-Tricalcium Phosphate at Room Temperature

摘要

The hydrogen atom(H atom)with a single 1s electron is a relatively stable paramagnetic species in a wide variety of substances when the temperature is sufficiently low.Under these conditions,its paramagnetism is very similar to that of a free atom.However,the wave function of the H atom is somewhat modified from the atomic 1s wave function by a crystalline field,that is,by its environment.In general,it is difficult to trap the H atom at room temperature because,in addition to being the smallest of all the elements,it is highly active.Electron spin resonance(ESR)investigations of a H atom have continuously attracted attention for a long time.The research of the trapped H atom was carried out by means of ESR spectroscopy from the latter half of the 1950s.Up to now,there are only a few examples of the H atom observable at ambient temperature.