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- E-ISSN 2288-8985
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Study on increasing the mass resolution in aerosol TOF mass spectrometer by using post focusing method
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2005, v.18 no.6, pp.483-490
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(2005). Study on increasing the mass resolution in aerosol TOF mass spectrometer by using post focusing method. Analytical Science and Technology, 18(6), 483-490.
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Abstract
TOF 비행시간을 이용한 에어로졸 질량분석기에서 질량분석기의 분해능은 발생하는 이온의 초 기에너지와 이온이 움직이는 진행방향에 따라 달라진다. 고출력 펄스형 레이저에 의하여 에어로졸로부터 용발되어 이온화된 원소들은 다른 속도로 사방으로 퍼져 나가게 되어 분해능 저하를 초래하는데 이를 방지하기 위해서 1차 가속된 이온들을 서로 다른 에너지로 후집속하여 같은 시간에 이온센서에 도달하도록 하는 장치에 대하여 연구를 수행하였다. 후집속 전위를 90o 방향으로 진행하는 이온을 중심으로 서로 다른 방향으로 걸어 줌으로써 TOF 영역을 지나 센서로 도입되는 이온의 도착 시간이 크게 개선되었음을 알 수 있었으며, 이를 실증하기 위하여 레이저 유도 이온을 만들고 후집속 장치를 구성하여 최적의 시간지연시간 및 전압 조건을 도출하여 그 성능을 증가시켰다.
- keywords
- TOF-MS, aerosol, post focusing, mass resolution
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