| 摘要 |
<p>A high pressure interface device for introducing sample ions to a drift tube (150), an ion detection means or a mass mobility measurement means, having an ion source ionization region (170) containing an isolated ionization source (132), a sample introduction port, and a reaction region (175) in which specific sample ion species are formed by reaction of sample molecules with selected ion source ions formed by radioactive bombardment of a sample gas by the ion source ions results in an ionized gaseous sample. When coupled to an ion or mass detection or measurement means (154, 156) this invention makes possible detection sensitivities of trace sample species in the subparts-per-trillion range, and under proper conditions does not need calibration.</p> |
