Abstract
The electronic structure and molecular orientation of dibenzo-18-crown-6 deposited on graphite were studied by ultraviolet photoelectron spectroscopy and metastable atom electron spectroscopy. We observed an alternate orientation of the molecule in the first monolayer and second layer. Moreover, the energy separations of the three top π-bands containing the highest occupied molecular orbital in the first layer were found to be clearly different from those in the multilayers, indicating that the conformation of the molecules in the first layer markedly changes even with a weak molecule-substrate interaction. © 2008 American Chemical Society.