The effect of oxygen exposure on pentacene electronic structure A. Vollmer, O. D. Jurchescu, I. Arfaoui, I. Salzmann, T. T. M. Palstra, P. Rudolf, J. Niemax, J. Pflaum, J. P. Rabe and N. Koch Eur. Phys. J. E, 17 3 (2005) 339-343 Published online: 21 June 2005 DOI: 10.1140/epje/i2005-10012-0