Formation and Photodissociation of Vanadium-sulfide Clusters

Vanadium-sulfide binary cluster ions were produced by direct laser ablation and analyzed by time-of-flight mass spectrometer.The vanadium-sulfide binary cluster ions are consisted of a binary skeleton and peripheral sulfur atoms.The “bear”skeleton （VS）n,which is the kernel of the clusters,is composed by same number vanadium and sulfur atoms.The relative stable series of the positive cluster ions V_nS_n⁺,V_nS_n+2⁺ ,V_nS_n+1⁺ （n=1,2,…,14） and the negative ions ,V_nS_n+2^- ,V_nS_n+3^-（n=1,2,…,12） are observd.The number of the peripheral sulfur atoms around skeleton increases if the sulfur-rich sample is used.These peripheral sulfur atoms are easy to be stripped in photodissociation,lising S 2,S 4 and S 6.