イメージ処理分光装置を用いた衝撃波管の発光スペクトルの測定

概要

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The emission spectrum of OH (A2Σ+-X2Π) and SiH (A2Δ-X2Π) 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 (A2Σ+) are found to be in equilibrium with the shock temperatures over 2800 to 4000 K in the test gas of 3.3% H2 +1.7% O2+Ar. It is also found that the addition of small amount of NO (2-4%) to SiH4+Ar mixtures has caused drastic suppression of SiH (A2Δ-X2Π) emissions at high temperatures of 2500 to 4400 K. The mechanism of the quenching of SiH by addition of NO is discussed.