QUASI-ISOTROPIC FRAGMENTATION OF PF_5 FOLLOWING P 2p PHOTOABSORPTION K. Ueda$^\ast$, Y. Muramatsu$^\ast$, Y. Shimizu$^\ast$, H. Chiba$^\ast$, Y. Sato$^\ast$, M. Kitajima$^\dagger$, H. Tanaka$^\dagger$ and H. Nakamatsu$^\ddagger$ $^\ast$Research Institute for Scientific Measurements, Tohoku University, Sendai 980-8577, Japan $^\dagger$Department of Physics, Sophia University, Tokyo 102-8554, Japan $^\ddagger$Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan The nearly isotropic ionic photofragmentation of a D_{3h} symmetry molecule PF_5 observed in the P 2p innershell excitation region is interpreted with a help of the first principles calculation of the symmetry-resolved P 2p absorption spectra.