ANISOTROPIC FRAGMENTATION OF CF_4 FOLLOWING F 1s PHOTOABSORPTION Y. Muramatsu$^\ast$, K. Ueda$^\ast$, Y. Shimizu$^\ast$, H. Chiba$^\ast$, Y. Sato$^\ast$ and H. Nakamatsu$^\dagger$ $^\ast$Research Institute for Scientific Measurements, Tohoku University, Sendai 980-8577, Japan $^\dagger$Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan The anisotropic ionic photofragmentation of a T_d symmetry molecule CF_4 observed in the C 1s innershell excitation region is interpreted with a help of the first principles calculation of the symmetry-resolved C 1s absorption spectra.