Site-selective dephasing of photo-excited triplet spins in CaO

Abstract

Electron spin dephasing in the photo-excited 3B1 state of the F22+ centre in CaO is studied from optically detected spin echoes after laser-selective optical pumping. The results show site-selective homogeneous broadening of the zero-field triplet spin transitions. Local concentration variations of nearby F+ centres are held responsible for inhomogeneities in the F22+-centre optical absorption and triplet-spin dynamics.