Formation and IR spectrum of monobridged SiH isolated in solid argon.

The infrared (IR) spectrum of monobridged SiH (denoted as mbr-SiH) isolated in solid Ar was recorded, and a set of lines (in the major matrix site) observed at 858.3 cm, 971.5 cm, 999.2 cm, 1572.7 cm, 2017.7 cm, 2150.4 cm, and 2158.4 cm were characterized. The species was produced by the electron bombardment of an Ar matrix sample containing a small proportion of SiH during matrix deposition. Upon photolysis of the matrix samples using 365 nm and 160 nm light, the content of mbr-SiH increased. The band positions, relative intensity ratios, and D-isotopic shift ratios of the observed IR features are generally in good agreement with those predicted by the B3LYP/aug-cc-pVTZ method. In addition, the photochemistry of the observed products was discussed.