| 摘要 |
<p>A time-of-flight mass spectrometer (11-13) in which sample ions are generated from a target (23) and are focussed into an ion beam (14) that is incident onto a detector (13). A barrier (212) that defines an aperture (213) in the path of the ion beam is positioned to block ions having an extra large deviation from an average time-of-flight of the ions, thereby improving resolution. The aperture can be adjusted to adjust a tradeoff between sensitivity and resolution. Alternatively, the position of the aperture or the bias on an einzel lens can be adjusted to control this resolution.</p> |
