Photoabsorption cross sections of CH4, CF4, CF3Cl, SF6, and C2F6 from 175 to 770 Å

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Abstract
Using synchrotron radiation as a continuum background, the photoabsorption cross sections of CH4, CF4, CF3Cl, SF6, and C2F6 were measured photoelectrically in the 175–770 Å region. Discrete structure was observed and attributed to the Rydberg states converging to the known states of the ions: In CH4, Rydberg states converging to the (2a1)−1 ion state with vibrational frequencies varying from 1800 to 2200 cm−1 were observed in the 563–627 Å region. In CF4, Rydberg states converging to the (4a1)−1 and (3t2)−1 ion states with vibrational frequencies varying from 550 to 730 cm−1 were observed in the 559–611 Å region. ’’Window’’ type Rydberg states converging to the (4a1)−1 ion states were also observed. In CF3Cl, discrete structure with energy spacings varying from 540 to 700 cm−1 was observed in the 614–666 Å region. The assignment of this structure to Rydberg states was not attempted because the vibrational structure of the CF3Cl ion states is not known. In SF6, structure was observed in the 630–676 Å region and was attributed to the Rydberg states converging to the (1t2g)−1 ion state.

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