The ARGUS multicollector noble gas mass spectrometer: Performance for 40Ar/39Ar geochronology
The ARGUS multicollector noble gas mass spectrometer: Performance for 40Ar/39Ar geochronology
复制标题
DOI：
10.1029/2009gc002643
复制
发表时间：
2009-10
期刊：
影响因子：
3.7
通讯作者：
D. Mark;D. Barfod;F. Stuart;J. Imlach
中科院分区：
文献类型：
--
作者：
D. Mark;D. Barfod;F. Stuart;J. Imlach
我们描述了一种新的高灵敏度多接收器惰性气体质谱仪（ARGUS），该质谱仪专门设计用于同时收集所有Ar同位素，因此非常适合40 Ar/39 Ar地质年代学。该仪器使用一个探测器外壳，其中装有五个法拉第收集器。一个集电极配备有1011欧姆电阻器（用于40 Ar），其余四个集电极配备有1012欧姆电阻器（用于36 Ar至39 Ar）。ARGUS的质量分辨率为225-250，在200 μA陷阱电流下测得的灵敏度为7 × 10−14 mol/V。在1个月的运行周期过程中，145次空气校准产生的加权平均40 Ar/36 Ar为300.67 ± 0.07（2σ，8个数据点被拒绝，均方加权偏差= 1.18）。三个矿物标准（泰勒溪流纹岩透长石，海德堡黑云母，和桤木溪透长石）的年龄是在接受的年龄误差，和两个不确定性是以前公布的数据的改进。与标准跳峰单收集器质谱仪相比，ARGUS缩短了分析时间，同时允许以更高的精度进行更多的测量。
We describe a new high‐sensitivity multicollector noble gas mass spectrometer (ARGUS) that has been specifically designed for simultaneous collection of all Ar isotopes and hence is ideally suited for 40Ar/39Ar geochronology. The instrument uses a detector housing that holds five Faraday collectors. One collector is equipped with a 1011 ohm resistor (for 40Ar), and the remaining four are fitted with 1012 ohm resistors (for 36Ar to 39Ar). ARGUS has a mass resolution of 225–250 and a measured sensitivity of 7 × 10−14 mol/V at 200 μA trap current. During the course of a 1 month run cycle 145 air calibrations yielded a weighted average 40Ar/36Ar of 300.67 ± 0.07 (2σ, eight data points rejected, and mean square weighted deviation = 1.18). The ages of three mineral standards (Taylor Creek Rhyolite sanidine, Heidelberg biotite, and Alder Creek sanidine) are within error of the accepted ages, and uncertainties for two are improvements on previously published data. ARGUS decreases analytical time while allowing more measurements to be made at higher precision compared to standard peak‐jumping single‐collector mass spectrometers.