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The total photodetachment cross section of a linear triatomic anion isderived for arbitrary laser polarization direction. The cross section is shownto be strongly oscillatory when the laser polarization direction is parallel tothe axis of the system; the oscillation amplitude decreases and vanishes as theangle between the laser polarization and the anion axis increases and becomesperpendicular to the axis. The average cross section over the orientations ofthe triatomic system is also obtained. The cross section of the triatomic anionis compared with the cross section of a two-center system. We find there aretwo oscillation frequencies in the triatomic anion in contrast to only oneoscillation frequency in the two-center case. Closed-orbit theory is used toexplain the oscillations.

Oscillations in the total photodetachment cross sections of a triatomic anion