The N-vacancy center in diamond was extensively studied and several novel properties identified. As a consequence the center had interesting applications. However, the center was not completely understood. Here, a new electronic model was proposed which accounted for the fine structure of the excited state and for many of the associated properties of the center. In addition the remaining difficulties were considered and the studies required to resolve the outstanding issues were indicated.

Issues Concerning the Nitrogen-Vacancy Center in Diamond. N.B.Manson, R.L.McMurtrie: Journal of Luminescence, 2007, 127[1], 98-103