Optical Oscillator Strengths of Hydrogen Bromide in the 4.5-20 eV Excitation Energy Region

The absolute optical oscillator strength density spectrum of HBr in the valence shell energy region of 4.5-20 eV has been determined by a high-resolution fast electron energy loss spectrometer. The optical oscillator strengths for the broad a³II + A¹II dissociation peak and the discrete transitions of ³II₁(v = 0) and C₁II(v '= 0,1,2) are reported. It has been manifested clearly that the optical oscillator strengths of some transitions for the previous photoabsorption method are subject to severe line-saturation effects.