Abstract
Spectra of the chemiluminescent flame produced by the reaction of silicon vapor with N2O have shown strong emission from the A1Π-X1Σ+, b3Π-X1Σ+, and a3Σ+-X1Σ+ systems of SiO with preferential excitation into the b3Π state. Bandhead measurements of 33 bands of the b-X system yielded the following constants for the b3Π state: Te=33947.0±1.9cm−1;ωe=1013.8±1.1cm−1;ωexe=7.57±0.12cm−1. From partially resolved rotational structure in the a-X bands, an approximate value of B = 0.59 ± 0.01cm−1 was obtained for the a3Σ+ state. The effect of adding active nitrogen and CO to the flame was investigated and the results were shown to be consistent with assigning the a and b states as triplets. The photon yield of the Si + N2O reaction was measured and found to be small.
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