REANALYSIS OF THE EMISSION SPECTRUM OF $I_{2}$ IN FOREIGN GASES
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Date
1981
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Ohio State University
Abstract
The emission spectrum of $I_{2}$ in foreign gases is studied as a function of pressure, temperature, end isotopic species, using a tesla discharge as $source.^{1}$ Evidence is found for at least 12 of the 18 ion-pair states arising from $I^{-}(^{1}S) + I^{+}(^{3}P,^{1}D)$, of which $D^{1}$(2g) appears to be the lowest. The pressure- and temperature-dependent spectra support the suggestion $^{2}$ that both the 3400-A system and a broad band near 5000 A originate from this state. High-resolution spectra show discrete structure in electronic bands at 2380 A, 2770 A, and 2880 A, in addition to the well-known F-X (2700 A), D$^{\prime}$-A$^{\prime}$(3400 A), and E-B (4300 A) systems. The 2380 system originates from a state near $51700 cm^{-1}$ and terminates on the X state near v = 50. The 2770 system, which was previously $analyzed^{3,4}$ as terminating on the X or B state, is now found to involve the A($lu^{3}\Pi$) $state.^{5}$ The 2880 system terminates on a weakly bound lower slate which probably dissociates to ground-stale atoms. Work is continuing on the other electronic bands of the emission spectrum, most of which appear to be diffuse.
Description
$^{1}$A. L. Guy, K.S. Viswanathan, A. Sur, and J. Tellinghuisen, Chem. Phys. Lett. 73, 582 (1980). $^{2}$H. Hemmati and G. J. Collins, Chem. Phys. Lett. 67, 5 (1979). $^{3}$P. Venkateswarlu, Phys. Rev. 81. 821 (1951). $^{4}$R. D. Verma, Proc. Ind. Acad. Sci. 48A, 197 (1958). $^{5}$K.S. Viswanathan, A. Sur, and J. Tellinghuisen, J. Mol. Spectrosc. (in press).
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