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CHEMILUMINESCENT EMISSION FROM THE REACTIONS OF VOLATILE SILICON COMPOUNDS AND ACTIVE NITROGEN *
Author(s) -
Schofield K.,
Broida H. P.
Publication year - 1965
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1965.tb09290.x
Subject(s) - chemiluminescence , nitrogen , chemistry , silicon , photochemistry , environmental chemistry , organic chemistry
— A spectroscopic investigation has been made of the chemiluminescent emission from atomic flames produced by the addition of volatile silicon compounds to active nitrogen. Of seven such additives, SiCI 6 proved to be the most intense source for SiN emission. The two electronic systems of SiN, the B 2 Σ‐X 2 Σ and C‐A 2 II, were detected both in the reaction vessel glow and also in an intense glow from a liquid nitrogen trap. An analysis of the relative vibration populations in the B 2 Σ electronic state of SiN showed large population inversions with a maximum population in the v = 5 level. A strong rotational perturbation of the B 2 Σ‐ X 2 Σ SiN system at v' = 4 in the K' = 13, 14, 19 and 21 levels indicated a leakage occurring from these perturbed levels into those of the perturbing state. The finding that bands of the C‐A 2 II system of SiN in the trap glow were enhanced in intensity relative to the B 2 Σ‐ X 2 Σ system has made a reinvestigation of the system possible. New bands of this system are reported and an analysis shows the need to increase the original numbering of v“ by one. Two new and unidentified spectra have been recorded which result from the addition of silicon compounds to active nitrogen—a green system in the 5180 to 6020 Å region. produced by SiCI 4 , and an orange chemiluminescence, 5540 to 7250 Å. through the addition of SiBr 4 .