Newly Observed 5π_{u 1/2}→5dR Bands and 5π_{u 1/2}→5d_σR, 5π_{u 3/2}→7sR, 10σ_g→6p_σR, 5π_{u 1/2}→7sR, 5π_{u 3/2}→6dR, and 5π_{u 3/2}→8sR Bands

In the fluorescence excitation spectra in the wavelength regions of λ_ex = 117.1 − 119.9 nm, one can find weak progressions of the bending ν₂ vibration. The 5d Rydberg orbitals are classified as σ_g, π_g and δ_g and the quantum defect for each orbital can be different. At present these weak bands are assigned to the 5d_π or 5d_δ Rydberg bands with different symmetries from that for the strong Rydberg bands observed in the absorption spectrum.

The quantum yield is determined to be 0.74 for the exciting light, λ_ex = 110.5 nm. High quantum yields for XeF^* excimer formation have been observed for the broad background absorption bands; the maximum quantum yield is recorded to be around 0.80 at λ_ex = 120 nm, although the noise level is high.

For the 10σ_g→6p_σR bands, the R value does not decrease from those for the background absorption, from which results it has been concluded that the symmetry of the 6p Rydberg orbital is of σ type.