Abstract
We report the first simultaneously performed transmission optical absorption and neutral lithium desorption yield experiments. Electron-stimulated desorption (ESD) of lithium atoms from lithium fluoride crystals was investigated with quadrupole mass spectroscopy. Correlations have been established between the desorption kinetics of lithium atoms and transmission optical absorption data (200–600 nm) obtained in situ as a function of irradiation time and temperature. The investigated temperature regime covered temperatures as low as room temperature up to 660 K. For temperatures lower than 640 K the data can be consistently explained by the assumption that lithium islands form on the surface of the crystals during bombardment and disintegrate after bombardment. The formation of lithium agglomerates is characterized by the occurrence of a very broad absorption band (maximum at 500 nm or higher). At higher temperatures the shape of the absorption spectrum changes in a way which can no longer be explained by simply assuming lithium islands on the surface.
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