Interference effects in the charge-induced spectrum of H2 at 4.2K

The fundamental vibrational infrared-absorption spectrum of solid H 2 at 4.2 K has been measured while the sample was irradiated with a 15-MeV proton beam. The Stark-shifted molecular transitions resulting from molecules that are the nearest neighbours of localized electrons have been observed and are contrasted with the same transition previously observed in solid D 2 . The differences are interpreted as evidence of an interference between the dipole of the localized electron and the charge-induced molecular dipole, a result of a coincidence in the frequencies of the molecular and electronic transitions.