On the mechanisms of formation of excited yttrium atoms under ion bombardment of yttrium and yttrium-aluminum garnet

摘要

A comparison of the emission spectra of excited yttrium atoms ejected from the surface of the metal yttrium and yttrium-aluminum garnet (YAG) by Ar+ ions with energy 20 keV to the emission spectra of excited yttrium atoms ejected from the surface of metal yttrium by Xe+ ions with energy 40 keV has been made. A sharp increase of population states of yttrium atoms with low energy excitation (z(2)D degrees, z(4)F degrees) ejected both from metallic yttrium and YAG under Ar+ bombardment was established when compared with the metallic yttrium bombarded Xe+ ions. The spatial distribution of radiation of excited yttrium atoms ejected from yttrium and YAG by Ar+ ions was measured. It showed that the yttrium atoms in the excited states z(2)G degrees and z(4)F degrees have low kinetic energy (order eV), whereas the yttrium atoms in other states have kinetic energy of order 100-300 eV and also more than 4 key. It was proposed that, in addition to formation by a collision mechanism, there are low excited yttrium atoms due the break-up of yttrium oxide molecules in unstable electron states of excited yttrium and oxygen atoms. (C) 2016 Elsevier Ltd. All rights reserved.