Long-lived charged states of single porphyrin-tape junctions under ambient conditions by Leary, E, Kastlunger, G, Limburg, B, Rincón-García, L, Hurtado-Gallego, J, González, MT, Bollinger, GR, Agrait, N, Higgins, SJ, Anderson, HL, Stadler, R, Nichols, RJ