Chemiluminescence of Si + N2O flames

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:

$T_e=33947.0\pm 1.9c{m}^{?1};{\omega }_e=1013.8\pm 1.1c{m}^{?1};{\omega }_e{x}_e=7.57\pm 0.12c{m}^{?1}$

. 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.