Abstract
Absorption features attributed to C2 have been observed for carbon in solid Ar, Kr, Xe, N2, CO2, and SF6 matrices at 4° and 20°K. For the CO2 matrix, five well-defined bands of the A 3Πg—X 3Πu Swan system and four bands believed to be the forbidden A 3Πg—x 1Σg+ system were obtained. For other matrices the bands were weak, wide, and few in number, making identification difficult. Measured vibrational constants are given. Swan system f-values for C2 in these matrices were measured and are in agreement with measured values for the gas phase. Measurements of C2 emission and absorption in a Xe matrix showed that the first vibrational level of the ground electronic state was populated in the matrix at 4°K, and that the vibrational energy was not easily removed. Absorptions from excited vibrational levels of the ground state also were observed for other matrices.
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