Samples Ag/O/S, Ag/O/Se and Ag/S/Se were ablated directly by laser to produce clusters. The detection was performed with a time-of-flight mass spectrometer (TOF MS). The cluster ions produced had the following distrib...Samples Ag/O/S, Ag/O/Se and Ag/S/Se were ablated directly by laser to produce clusters. The detection was performed with a time-of-flight mass spectrometer (TOF MS). The cluster ions produced had the following distribution: Ag/S binary cluster ions for sample Ag/O/S, Ag/Se binary cluster ions for sample Ag/O/Se, and Ag/Se binary cluster ions and Ag/S/Se ternary cluster ions as the main products for sample Ag/S/Se. Laser double ablation reactor was used to study the reaction between Ag/S(Se, O) binary clusters and Se(S) homoclusters. The experiments show that Se clusters can replace S and O in Ag/S and Ag/O clusters while S clusters can replace O in Ag/O clusters. This fact indicates the sequence of the clustering ability of Ag presented as follows: Ag/Se 】 Ag/S 】 Ag/O, which was also proved by theoretical calculation. The reason of this tendency was considered to be the different abilities of the elements’ polarization, which acts on the stability of clusters.展开更多
Copper-sulfur cluster ions were produced by laser ablation on solid samples: (1) a mixture of copper and sulfur powder, (2) cuprous sulfide compound, (3)cupric suffide compound, respectively. Two main series of cluste...Copper-sulfur cluster ions were produced by laser ablation on solid samples: (1) a mixture of copper and sulfur powder, (2) cuprous sulfide compound, (3)cupric suffide compound, respectively. Two main series of cluster ions were found: (a)[Cu(Cu2S)n]+(n=0-22), (b) [(Cu2S)n]+(n=1-18). The main photodissociation channels of the cluster ions were neutral losses of Cu2S, Cu or CuS. It is obvious that the Cu2S unit plays an important role in the formation and structure of the Cu/S cluster ions, and farthermore, the mied d10 shell eletronic configuration of copper element might be critical to the characteristic of the cluster ions.展开更多
用飞行时间质谱仪研究了激光直接溅射 Ag/Se混合样品产生的二元团簇以及团簇正离子的光解行为 ;并用串级溅射反应装置研究了 Ag和 Se正负离子产物 .在直接溅射产生的 Ag/Se二元团簇中 ,正离子主要系列是 :[(Ag2 Se) n Ag+ ],[(Ag2 Se) n...用飞行时间质谱仪研究了激光直接溅射 Ag/Se混合样品产生的二元团簇以及团簇正离子的光解行为 ;并用串级溅射反应装置研究了 Ag和 Se正负离子产物 .在直接溅射产生的 Ag/Se二元团簇中 ,正离子主要系列是 :[(Ag2 Se) n Ag+ ],[(Ag2 Se) n Ag+ 3];负离子主要系列是 :[(Ag2 Se) n Ag Se- ],[(Ag2 Se) n Ag Se- 2 ],[(Ag2 Se) n Se- ].团簇正离子的光解结果表明 ,同样条件下 Ag/Se二元团簇正离子光解比率比 Ag/S大 .在Ag和 Se样品串级溅射实验中 ,主要得到 Ag Se+ n (n=4～ 9)和 Ag Se- n (n=4～ 7)系列的产物 ,在 Ag Se+ n 系列中 ,n=4,6时丰度较大 .展开更多
文摘Samples Ag/O/S, Ag/O/Se and Ag/S/Se were ablated directly by laser to produce clusters. The detection was performed with a time-of-flight mass spectrometer (TOF MS). The cluster ions produced had the following distribution: Ag/S binary cluster ions for sample Ag/O/S, Ag/Se binary cluster ions for sample Ag/O/Se, and Ag/Se binary cluster ions and Ag/S/Se ternary cluster ions as the main products for sample Ag/S/Se. Laser double ablation reactor was used to study the reaction between Ag/S(Se, O) binary clusters and Se(S) homoclusters. The experiments show that Se clusters can replace S and O in Ag/S and Ag/O clusters while S clusters can replace O in Ag/O clusters. This fact indicates the sequence of the clustering ability of Ag presented as follows: Ag/Se 】 Ag/S 】 Ag/O, which was also proved by theoretical calculation. The reason of this tendency was considered to be the different abilities of the elements’ polarization, which acts on the stability of clusters.
文摘Copper-sulfur cluster ions were produced by laser ablation on solid samples: (1) a mixture of copper and sulfur powder, (2) cuprous sulfide compound, (3)cupric suffide compound, respectively. Two main series of cluster ions were found: (a)[Cu(Cu2S)n]+(n=0-22), (b) [(Cu2S)n]+(n=1-18). The main photodissociation channels of the cluster ions were neutral losses of Cu2S, Cu or CuS. It is obvious that the Cu2S unit plays an important role in the formation and structure of the Cu/S cluster ions, and farthermore, the mied d10 shell eletronic configuration of copper element might be critical to the characteristic of the cluster ions.
文摘用飞行时间质谱仪研究了激光直接溅射 Ag/Se混合样品产生的二元团簇以及团簇正离子的光解行为 ;并用串级溅射反应装置研究了 Ag和 Se正负离子产物 .在直接溅射产生的 Ag/Se二元团簇中 ,正离子主要系列是 :[(Ag2 Se) n Ag+ ],[(Ag2 Se) n Ag+ 3];负离子主要系列是 :[(Ag2 Se) n Ag Se- ],[(Ag2 Se) n Ag Se- 2 ],[(Ag2 Se) n Se- ].团簇正离子的光解结果表明 ,同样条件下 Ag/Se二元团簇正离子光解比率比 Ag/S大 .在Ag和 Se样品串级溅射实验中 ,主要得到 Ag Se+ n (n=4～ 9)和 Ag Se- n (n=4～ 7)系列的产物 ,在 Ag Se+ n 系列中 ,n=4,6时丰度较大 .
