S. Jorgensen et al., Time-resolved two-photon photoemission spectroscopy of image potential states: A phenomenological approach, J CHEM PHYS, 115(9), 2001, pp. 4314-4321
The dynamics of the image potential states n = 3 and n = 4 at the Cu(100) s
urface are studied. We solve the Liouville-von Neumann equation for an open
system and treat the dissipation within the Lindblad formalism. We compute
the two-photon photoemission spectrum (2PPE) using first order perturbatio
n theory and study the populations of the image potential states and the tw
o-photon photoemission spectrum as functions of the lifetimes and dephasing
s of the image potential states. The computed two-photon photoemission spec
trum is compared with the measured spectrum obtained by Hofer et al. [Appl.
Phys. B 68, 383 (1999); Science 277, 1480 (1997)]. (C) 2001 American Insti
tute of Physics.