Pastor S J, Dienes T, Yao J, Wilkins C L
Department of Chemistry, University of California, Riverside 92521, USA.
J Am Soc Mass Spectrom. 1998 Sep;9(9):931-7. doi: 10.1016/S1044-0305(98)00061-0.
Low-voltage on-resonance ion selection (LOIS) was recently introduced as an alternative technique for ion selection and storage. Under high pressure conditions and similar to the technique of quadrupolar axialization, unwanted (unselected) trapped ions are eliminated from the analysis cell through collisions with cell plates following orbital expansion. The ions remaining after tens of seconds of mass selection can be detected with better coherence, leading to improvements in ion detection and sensitivity. Here, experiments designed to test ion remeasurement and ion transfer capabilities are presented. Simulations of ion motion give insight into the possible mechanism of ion cooling, which does appear to be the same as that of the axialization process. Because of its ease of use, lack of need for additional hardware devices, and comparable ion selection results, LOIS is an attractive alternative for trapped ion experiments.
低电压共振离子选择（LOIS）是最近引入的一种用于离子选择和存储的替代技术。在高压条件下，与四极轴向化技术类似，在轨道扩展后，通过与分析池极板的碰撞，将不需要的（未被选择的）捕获离子从分析池中消除。经过数十秒质量选择后剩余的离子可以以更好的相干性进行检测，从而提高离子检测和灵敏度。在此，展示了旨在测试离子重新测量和离子转移能力的实验。离子运动模拟有助于深入了解离子冷却的可能机制，其似乎与轴向化过程相同。由于其使用简便、无需额外硬件设备且离子选择结果相当，LOIS是捕获离子实验的一种有吸引力的替代方案。
