Abstract
The ground state of the yttrium atom a2D3/2 belongs to the 4d5s 2 configuration. The excitation of the yttrium atom by electron impact is accompanied by a change in the state of one or both s-electrons and appreciably more rarely of the d-electron. States both with the multiplicity of the ground state (doublet terms) and with a multiplicity differing from the multiplicity of the ground state (quartet terms) are populated as a result of the excitation. The effective excitation cross sections of the yttrium atom have not been investigated up to the present due to the low saturated vapor pressure at the relatively high melting temperature (at 1800~ Pa).
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