Photo-atomic effect: Temperature dependence of the photodesorption of Na and Na2 from polymer surfaces J. H. Xu, F. Mango, G. Alzetta and R. A. Bernheim Eur. Phys. J. D, 10 2 (2000) 243-246 Published online: 15 May 2000 DOI: 10.1007/s100530050545