Formation and Photodissociation of Iron-Selenium Clusters

Fe-Se binary cluster ions produced by direct laser ablation, were studied with a tandem time-of-flight mass spectrometer. It Was found that Fe_n Se_n ⁺, Fe_n Se_n-1 ⁺ in cluster cations,Fe_n Se_n ^-, Fe_n Se_{n +1} ^- in cluster anions were main compositions of binary cluster ions. The photodissociation of cations Fe_n Se_m ⁺ showed that Fe_n Se_n ⁺, Fe_n Se_n-1 ⁺ were main photofragments, confirming their special stablity. The possible structures of Fe₂ Se₂ ⁺ were calculated by Density Function Theory （B3LYP/LANL2DZ）.