  The Si III] 1892A intercombination line shows an anomalously high intensity
in spectra of the radiation-rich Weigelt blobs in the vicinity of Eta Carinae.
The line disappears during the 100 days long spectral events occurring every
5.5 years. The aim is to investigate whether resonance-enhanced two-photon
ionization (RETPI) is a plausible excitation mechanism for the Si III] 1892A
line. The possible intensity enhancement of the 1892A line is investigated as
regards quasi-resonant intermediate energy levels of Si II. The RETPI mechanism
is effective on SiII in the radiation-rich Weigelt blobs where the two
excitation steps are provided by the two intense hydrogen lines Ly alpha and Ly
gamma
