화학공학소재연구정보센터
Chemical Physics Letters, Vol.500, No.4-6, 291-294, 2010
Desorption of H atoms from graphite (0001) using XUV free electron laser pulses
The desorption of neutral H atoms from graphite with femtosecond XUV pulses is reported. The velocity distribution of the atoms peaks at extremely low kinetic energies. A DFT-based electron scattering calculation traces this distribution to desorption out of specific adsorption sites on graphite, and identifies the highest vibrational state in the adsorbate potential as a major source for the slow atoms. It is evident that multiple electron scattering processes are required for this desorption. A direct electronic excitation of a repulsive hydrogen-carbon bond seems not to be important. (C) 2010 Elsevier B.V. All rights reserved.