TOF-SIMS二次離子光學系統仿真研究
中國測試劉曉旭1， 齊國臣1， 包澤民1， Stephen Clement2， 邱春玲1， 田 地1， 龍
摘 要：為實現飛行時間二次離子質譜儀（TOF-SIMS）對二次離子束的提取并提高儀器的調試效率，采用離子光學仿真軟件SIMION 8.0對TOF-SIMS二次離子光學系統進行仿真。以穩定同位素銅離子為對象，通過仿真，研究二次離子光學系統中二次離子提取系統透鏡電極電壓的調整對質量分辨率的影響，確定最佳透鏡電極電壓組合,并得到穩定同位素銅離子的仿真譜圖。仿真研究表明：當初級提取電極電壓為800 V、單透鏡有效電極電壓為-4 400 V時，質量分辨率最高。在TOF-SIMS實驗平臺上對銅樣品靶進行實驗測試，實驗與仿真結果相吻合，表明設計的二次離子光學系統可用于TOF-SIMS儀器的二次離子束提取，為實驗參數的選擇提供參考，從而提高儀器調試效率。
關鍵詞：飛行時間二次離子質譜儀；二次離子光學系統；仿真；透鏡電極電壓；質量分辨率
文獻標志碼：A 文章編號：1674-5124（2016）01-0130-04
Simulation research of secondary ion optical system in TOF-SIMS
LIU Xiaoxu1， QI Guochen1， BAO Zemin1， Stephen Clement2， QIU Chunling1， TIAN Di1， LONG Tao2
（1. College of Instrumentation and Electrical Engineering，Jilin University，Changchun 130022，China；
2. Institute of Geology，Chinese Academy of Geological Science，Beijing 100037，China）
Abstract: In order to extract secondary ion beams with TOF-SIMS and improve its commissioning efficiency， this paper has simulated the secondary ion optical system in TOF-SIMS based on ion optical simulation software SIMION 8.0. Taking stable isotopic copper ions as the study objects， this paper simulated what would happen to the mass resolution after the adjustment of electrode voltage in the secondary ion extraction system， determined the best combination of electrode voltage in lens， and obtained the simulation spectrum for stable isotopic copper ion. The study reveals that the highest mass resolution can be achieved when the voltage on the primary extraction electrode is 800 V and the voltage on the effective electrode in the einzel lens is-4 400 V. After that， experiments are conducted to test the copper sample target on a TOF-SIMS experimental platform. The results are consistent with those gained by simulation， which indicates that this system can be used for extracting secondary ion beams in TOF-SIMS and the simulation test can provide a reference selecting experimental parameters to increase the equipment commissioning efficiency.
Keywords: TOF-SIMS； secondary ion optical system； simulation； voltages of electrodes in lens； mass resolution
