The optical spectroscopic study of the Ar afterglow reaction of SiI
4 has led to the observation of two visible emission systems of SiI. A new red-degraded emission in the 430-480 nm region was assigned to the
A2Σ+-X2II1/2 system by comparison with absorption spectrum. The
a (
4Σ
-1/2)-
X2II3/2 system was detected in the 490-560 nm region. The intensity was so strong that several new bands could be identified in longer wavelengths. The excitation source of SiI emission was concluded to be metastable Ara
+ions.
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