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首页> 外文期刊>International journal of mass spectrometry >Comparison of quadrupole mass filters with hyperbolic and cylindrical rods working in the third stability zone
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Comparison of quadrupole mass filters with hyperbolic and cylindrical rods working in the third stability zone

机译：具有双曲杆和圆柱杆的四极质量过滤器在第三稳定区工作的比较

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摘要

The working point of a quadrupole mass filter is generally set in the first zone of stability. For applications that require higher resolutions other stability zones can provide a suitable alternative and in this article it is investigated the third zone in particular for applications in the low mass range. Ion trajectory simulations for 4He+ have been carried out for cylindrical as well as hyperbolic rods and the results have been compared. For cylindrical rods the best mass resolution has been obtained with a ratio between rod radius and field radius of 1.120. For this value further simulations have been performed to determine the dependence of transmission on the injection regions and injection angle in the quadrupole field. The analysis of the transmission regarding low and high mass tails has shown that it is possible to get rid of the low mass tails for cylindrical rods by limiting the injection region, instead the high mass tails, which affect the transmission for both cylindrical and hyperbolic rods, can be reduced by increasing the frequency of the radio frequency applied to the rods. Therefore, although the mass resolution at 50% of the peak height for hyperbolic rods is always greater than for cylindrical ones, with a suitable (reduced) ion injection region, the maximum transmission and the baseline resolution of a filter equipped with cylindrical rods can be made to approach that of a hyperbolic rod filter.
机译：通常将四极杆质量过滤器的工作点设置在稳定性的第一区域中。对于需要更高分辨率的应用，其他稳定性区域可以提供合适的替代方法，在本文中，我们专门针对低质量范围的应用研究了第三区域。对圆柱和双曲杆进行了4He +的离子轨迹模拟，并对结果进行了比较。对于圆柱棒，已获得最佳质量分辨率，且棒半径与场半径之比为1.120。对于该值，已经进行了进一步的仿真以确定传输对四极场中注入区域和注入角的依赖性。对低质量和高质量尾部的传递的分析表明，可以通过限制注射区域来摆脱圆柱状棒的低质量尾部，而通过高质量的尾部来影响圆柱和双曲杆的传递可以通过增加施加到棒上的射频的频率来减小。因此，尽管双曲线杆在峰高的50％处的质量分辨率始终大于圆柱形，但在离子注入区域合适（减小）的情况下，配备有圆柱形杆的过滤器的最大透射率和基线分辨率可以达到接近双曲杆过滤器。

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