The emission spectrum of OH (A
2Σ
+-X
2Π) and SiH (A
2Δ-X
2Π) have been studied behind reflected shock waves. A piston-driven shock tube has been used to get a good reproducibility of the shock heated conditions and the spectrum have been obtained by the computerprocessed imaging spectrometer. The vibrational temperatures of OH (A
2Σ
+) are found to be in equilibrium with the shock temperatures over 2800 to 4000 K in the test gas of 3.3% H
2 +1.7% O
2+Ar. It is also found that the addition of small amount of NO (2-4%) to SiH
4+Ar mixtures has caused drastic suppression of SiH (A
2Δ-X
2Π) emissions at high temperatures of 2500 to 4400 K. The mechanism of the quenching of SiH by addition of NO is discussed.
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