RELAX: An ultrasensitive, resonance ionization mass spectrometer for xenon
RELAX: An ultrasensitive, resonance ionization mass spectrometer for xenon
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RELAX：超灵敏氙气共振电离质谱仪
DOI：
10.1063/1.1145127
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发表时间：
1994
影响因子：
1.6
通讯作者：
G. Turner
中科院分区：
文献类型：
--
作者：
J. Gilmour;I. Lyon;W. Johnston;G. Turner
RELAX是一种共振电离飞行时间质谱仪，增加了一个低温样品浓缩器。这导致灵敏度增加了100倍以上。样品浓缩器由离子源中的局部冷点和加热激光器组成，样品在该冷点上凝聚，以将凝聚的样品释放到电离区。样品原子的抗探测寿命接近20min，相当于1000个原子样品的计数速率为1cps，而质量分辨率为300(10%峰高)。灵敏度取决于样品原子返回冷点的时间(10 S)和这些原子随后电离的比例(∼1%)。可测量的最小样品大小仅受空白的限制，目前为2×10−15cc STP总氙气和同位素大气(这可归因于仪器在开发过程中进入仪器的大等份氙气，因此可能会随着时间的推移而减少)。那个.。
RELAX is a resonance ionization, time‐of‐flight mass spectrometer to which a cryogenic sample concentrator has been added. This has resulted in an increase in sensitivity by a factor greater than 100. The sample concentrator consists of a localized cold spot in the ion source, onto which the sample condenses, and a heating laser to release the condensed sample into the ionization region. The lifetime against detection of a sample atom is close to 20 min, which corresponds to a count rate of 1 cps from a sample of 1000 atoms, while the mass resolution is 300 (10% peak height). Sensitivity depends on the return time of sample atoms to the cold spot (10 s) and the fraction of these atoms subsequently ionized (∼1%). The minimum sample size which can be measured is limited only by blank, which is currently 2×10−15 cc STP total xenon and isotopically atmospheric (this can be attributed to the large aliquots of xenon admitted to the instrument during development, and so may be expected to decrease with time). Th...