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Electronic transitions of the title molecules were measured between 250 and710 nm using a mass-resolved 1+1' resonant two-photon ionization technique at aresolution of 0.1 nm. Calculations at the B3LYP/aug-cc-pVQZ level of theorysupport the analyses. Because of their spectral properties, SiC$_2$, linearSi$_2$C$_2$, Si$_3$C, and SiC$_6$H$_4$ are interesting target species forastronomical searches in the visible spectral region. Of special relevance isthe Si--C$_2$--Si chain, which features a prominent band at 516.4 nm of astrong transition ($f=0.25$). This band and one from SiC$_6$H$_4$ at 445.3 nmwere also investigated at higher resolution (0.002 nm).

Electronic transitions of jet-cooled SiC2, Si2Cn (n=1-3), Si3Cn (n=1,2), and SiC6H4 between 250 and 710 nm