Excitonic energy transfer process in Ne-Kr alloy studied by photon stimulated desorption of metastable atoms

摘要

Metastable atom desorption from a pure solid Ne and a solid Ne-Kr alloy has been systematically studied using a monochromatic synchrotron radiation. Refined time-of-flight spectrometer enabled us to investigate the desorption mechanism in more detail. Metastable Ne atoms desorbed through cavity ejection mechanism by the excitation of the first order surface, and the first and the second order bulk excitons are found to have almost the same kinetic energy, E_k = 0.18 ± 0.02 eV, while by 2p~53p type surface exciton, E_k = 0.21 ± 0.02 eV. By the excitation of Ne bulk exciton in Ne-Kr alloy, effective excitonic energy transfer process has been observed, which results in the decrease of the Ne~* desorption yield by the bulk excitation.