Photodetachment of Trapped Negative Gold Ions: Ii. Observation of Window Resonances

We present measurements of photodetachment cross sections of negative gold ions stored in a RF trap, in the energy range from about 4000 cm(-1) to 13 750 cm(-1) above threshold. A number of different laser devices have been used. The results complement those described in a previous paper. The photodetachment spectrum exhibits a strong resonance, located at 23 550 cm(-1) above Au- ground level and a much fainter one at 24 200 cm(-1). These resonances can be represented as Fano profiles and reveal the presence of autodetaching excited levels of Au- (most probably 5d(10)6s6p P-3(1) and 5d(9)(5/2)6s(2)6p(3/2) J = 1). Furthermore, the opening of a new photodetachment channel near 360 nm (corresponding to the first excited level of neutral Au) is accompanied by an increase of the photodetachment yield.