Spectroscopy of Carbon Vapor Condensed in Rare‐Gas Matrices at 4°K. III

For C3, controlled warming of neon matrices containing carbon vapor caused the multiple sites for C3 molecules to disappear. The assignments of vibronic transitions in the 1IIu←X1Σg+ system could then be made more definite using the parameters of Gausset, Herzberg, Lagerqvist, and Rosen. Two unaccounted‐for bands were attributed to transitions involving v3′≅840 cm−1. This low value was rationalized by comparison with other similar molecules. The 1Σu+←X1Σg+ transition of C3 in a neon matrix was not observed in the ultraviolet out to 1950 A.For C2, the spectrum of carbon—neon matrices, before and after warming to 12°K, indicated that the absorption bands in the region of 4000–6000 A are probably not the C2 Swan system but may be due to a larger carbon molecule. A band at 2320 A in neon was attributed to the (0, 0) band of the Mulliken system (1Σu+←x1Σg+ of C2. These and other observations indicate that the trapping of C2 in the excited 3IIu state in matrices is doubtful.CNN is formed in neon matrices contai...

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