Li Ka emission spectrum of LiF under electron beam irradiation
Résumé
It is possible to obtain the Li Ka spectrum of LiF on an electron microprobe, with minimal damages, provided a low acceleration energy (1 kV) and a small current density (1 pA/µm 2 ) are used. The presented spectrum agrees with the one obtained with synchrotron radiation many years ago and expected free of damages. The spectrum displays two main peaks: the first one at c.a. 47 eV coming from the electron transition from the occupied valence states toward the Li 1s core level; the second one at c.a. 62 eV giving evidence of the radiative recombination of the lithium core exciton. These features, as well as the background due to cathodoluminescence, change drastically after one minute of electron irradiation, due to fluorine leaving the sample and the subsequent oxidation of the remaining lithium atoms in the residual atmosphere of the microprobe.
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