| 摘要 |
<p>An apparatus and method for introducing ions into a vacuum chamber of a m ass spectrometer includes producing ions in an ionization chamber of an ion source. The ions are sampled into an intermediate pressure chamber via a fir st ion transfer tube, hi particular, the pressure within the intermediate pr essure chamber is maintained at a value that exceeds a maximum pressure for being sampled into the vacuum chamber of the mass spectrometer. Some of the ions are sampled from the intermediate pressure chamber via at least a secon d ion transfer tube, the at least a second ion transfer tube having an outle t end that is in communication with a low-pressure chamber, hi particular, t he pressure within the low-pressure chamber is maintained at a value that is less than a maximum pressure for being sampled into the vacuum chamber of t he mass spectrometer. Some of the ions are sampled from the low-pressure cha mber into the vacuum chamber of the mass spectrometer.</p> |
