Submillimeter ESR spectroscopy of van Vleck paramagnets in parallel fields
Malkin B. Z. , Tarasov V. F. , Shakurov G. S.
The hyperfine structure of the magnetic dipole transition between the ground and excited singlet states of a Ho3+ ion was resolved in the ESR spectrum of the van Vleck paramagnet KY3F10:Ho using parallel (static and alternating) magnetic fields. © 1995 American Institute ofPhys-