scholarly journals Fabrication of silicon‐based optical components for an ultraclean accelerator mass spectrometry negative ion source

1994 ◽  
Vol 65 (5) ◽  
pp. 1570-1574 ◽  
Author(s):  
J. F. Kirchhoff ◽  
D. K. Marble ◽  
D. L. Weathers ◽  
F. D. McDaniel ◽  
S. Matteson ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Ion Source ◽  
Negative Ion ◽  
Optical Components ◽  
Silicon Based

A multisample, high‐intensity Cs sputter negative ion source for accelerator mass spectrometry applications

1992 ◽  
Vol 63 (4) ◽  
pp. 2472-2474 ◽  
Author(s):  
Si Houzhi ◽  
Zhang Weizhong ◽  
Zhu Jinhua ◽  
Du Guangtian ◽  
Zhang Tiaorong
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
High Intensity ◽  
Ion Source ◽  
Negative Ion

scholarly journals Simultaneous Quantification of Six Bioactive Components in Decoction of Ziziphi spinosae Semen Using Ultrahigh Performance Liquid Chromatography Coupled with Triple-Quadrupole Mass Spectrometry

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Xiao Liu ◽  
Xiaochai Zhu ◽  
Hui Zhu ◽  
Li Xie ◽  
Jia Ma ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Betulinic Acid ◽  
Ion Source ◽  
Negative Ion ◽  
Phase System ◽  
Triple Quadrupole ◽  
Bioactive Components ◽  
Simultaneous Quantification ◽  
Ultrahigh Performance Liquid Chromatography

This paper was conducted to develop a method containing ultrahigh performance liquid chromatography coupled with triple-quadrupole tandem mass spectrometry for simultaneous quantification of six bioactive components in the decoction of Ziziphi spinosae Semen. Analysis was performed on an Agilent ZORBAX Extend-C18 column (2.1 × 100 mm, 1.8 μm) and eluted with a mobile phase system consisting of acetonitrile and water under a gradient program with a flow rate of 0.3 ml/min. The injection volume was 2 μl. Multiple-reaction monitoring scanning detection was employed for quantification with an electrospray ion source in the negative ion mode. All the six compounds showed good linearities (r≥0.9996). The LODs of the six bioactive compounds were 0.039 ng/ml, 0.092 ng/ml, 3.112 ng/ml, 2.131 ng/ml, 0.099 ng/ml, and 0.071 ng/ml for spinosin, 6‴-feruloylspinosin, jujuboside A, jujuboside B, camelliaside B, and betulinic acid, respectively. The LOQs were 0.118 ng/ml, 0.276 ng/ml, 9.336 ng/ml, 6.393 ng/ml, 0.299 ng/ml, and 0.213 ng/ml for spinosin, 6‴-feruloylspinosin, jujuboside A, jujuboside B, camelliaside B, and betulinic acid, respectively. According to our knowledge, it was the first time to establish a method with high efficiency and accuracy for the quantification of six bioactive components in the decoction of Ziziphi spinosae Semen, which would provide references for quality control and evaluation of Ziziphi spinosae Semen.

A microbeam Cs ion source for accelerator mass spectrometry

1998 ◽  
Vol 69 (3) ◽  
pp. 1353-1358 ◽  
Author(s):  
S. H. Sie ◽  
T. R. Niklaus ◽  
G. F. Suter ◽  
F. Bruhn
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Ion Source

scholarly journals Radiocarbon with Gas Chromatography

Radiocarbon ◽  
1995 ◽  
Vol 37 (2) ◽  
pp. 711-716 ◽  
Author(s):  
Christopher Bronk Ramsey ◽  
R. E. M. Hedges
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Pilot Study ◽  
Accelerator Mass Spectrometry ◽  
Ion Source ◽  
Tracer Studies ◽  
Chemical Fractions ◽  
Peak Sensitivity ◽  
Accelerator System

In 14C tracer studies, and when looking for modern contamination in archaeological samples, it is often necessary to measure the 14C concentration of individual chemical fractions. Gas chromatography (GC) is one method that is frequently used for separation of chemical fractions. The gas ion source at the Oxford Radiocarbon Accelerator Unit for accelerator mass spectrometry (AMS) provides the opportunity to measure fractions from a GC instrument directly. Although the first investigations are likely to be 14C tracer studies, such a GC-AMS system could find much wider application. We present results from a pilot study of the peak sensitivity, baseline stability and crosstalk of the accelerator system used in this way. We also discuss the practical considerations in developing a GC-AMS instrument for routine use.

scholarly journals Optimizing a microwave gas ion source for continuous-flow accelerator mass spectrometry

2012 ◽  
Vol 83 (2) ◽  
pp. 02B304 ◽  
Author(s):  
K. F. von Reden ◽  
M. L. Roberts ◽  
J. R. Burton ◽  
S. R. Beaupré
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Continuous Flow ◽  
Ion Source

Searching For A Suitable Gas Ion Source For 14C Accelerator Mass Spectrometry

2007 ◽  
Author(s):  
Karl von Reden ◽  
Mark Roberts ◽  
Baoxi Han ◽  
Robert Schneider ◽  
John Wills
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Ion Source

New design of an ion source for accelerator mass spectrometry at the Lund Pelletron

1998 ◽  
Vol 69 (2) ◽  
pp. 1188-1190 ◽  
Author(s):  
Per Persson ◽  
Kim Freimann ◽  
Ragnar Hellborg ◽  
Kjell Håkansson ◽  
Göran Skog ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Ion Source

Chairman’s introduction

1987 ◽  
Vol 323 (1569) ◽  
pp. 3-4
Keyword(s):  
Mass Spectrometry ◽  
Water Sample ◽  
Accelerator Mass Spectrometry ◽  
Ion Source ◽  
Unique Combination ◽  
Accelerated Particles

The first significant experiment using the technique of accelerator mass spectrometry (AMS) was reported by Alvarez & Cornog in 1939. It was widely thought at the time that tritium , and not 3 He, was stable, and with that in m ind Rutherford had asked Aston to search for hydrogen of mass three in a specially prepared water sample. The result was negative and Rutherford reported this in the last paper he wrote, which was published in Nature a few months before his death in 1937. Alvarez realized that if 3 He, and not tritium , were stable then it should be present in ordinary helium, presumably at a low abundance level. He therefore fed helium into the ion source of the Berkeley 60 inch cyclotron and soon demonstrated the existence of a 24 MeV beam corresponding to mass three and charge two, a unique combination. This identification was confirmed by a measurement of the range of the accelerated particles. Subsequently, Alvarez & Cornog showed that the abundance of 3 He in atmospheric helium was about ten times greater than in well helium, although their absolute abundances were rather lower than the currently accepted values.

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