Knowledge Bank

Kinetic spectroscopy of a flash-photolyzed mixture of Xe and $UF6$ yielded the B-X transition (300--355 nm) of XeF in absorption. Vibrational assignments were made for 22 bands $(0\le vprime \le 12,0\le v\prime \prime \le 4)$, and confirmed by computer modeling of the relative absorption intensities. Constants for XeF(B-X) are: $Te=28813.9\pm 0.5cm-1\omega e\prime =308.23\pm 0.5cm-1xe\omega e=1.4266\pm 0.03cm-1\omega e\prime =225.06\pm 1.4cm-1xe\omega e\prime =10.568\pm 0.4cm-1,and\Delta Re=Re\prime -Re\prime =0.35\pm 0.02 \backslash AA$. Studies of other rare gas halides by both flash photolysis and by tunable laser fluorescence spectroscopy will be discussed.