The B2Σ+ → A2Πi system of silicon nitride,SiN |
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Authors: | Stephen C. Foster |
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Affiliation: | Herzberg Institute of Astrophysics, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada |
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Abstract: | The 440-nm violet-degraded bands of SiN, which were previously assigned to a system, have been reanalyzed. These bands are shown to be Δv = 0, ±1 sequence bands of the B2Σ+ → A2Π system of SiN. The first reliable value of Te(A2Π) = 994.4(1) cm?1 has been obtained, and this determines the location of the D2Π and L2Π states with respect to the ground state. The B2Σ+, v = 7 and D2Π, v = 3 levels are shown to be mutually perturbing. A detailed study has been made of the perturbed X2Σ+, v = 8 level. The 6–8 band of the B → X system has been photographed at high resolution. A deperturbation of this band confirms Te(A2Π), and provides the first experimental verification of the inverted nature of the A state. |
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