Ultralong coherence times in the purely electronic zero-phonon line emission of single molecules June 28, 2012June 16, 2015 akiraz papers-2004 A. Kiraz, M. Ehrl, C. Bräuchle, and A. Zumbusch* Appl. Phys. Lett. 85, 920-922 (2004) DOI: 10.1063/1.1779351 (PDF)