Test of negative ion beams from a microwave ion source with a charge exchange canal for accelerator mass spectrometry applications

2002 ◽  
Vol 73 (2) ◽  
pp. 846-848 ◽  
Author(s):  
S-W. Kim ◽  
R. J. Schneider ◽  
K. F. von Reden ◽  
J. M. Hayes ◽  
J. S. C. Wills
Keyword(s):  
Mass Spectrometry ◽  
Charge Exchange ◽  
Accelerator Mass Spectrometry ◽  
Ion Beams ◽  
Ion Source ◽  
Negative Ion ◽  
Microwave Ion Source ◽  
A Charge

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

scholarly journals A Continuous-Flow Gas Chromatography 14C Accelerator Mass Spectrometry System

Radiocarbon ◽  
2010 ◽  
Vol 52 (2) ◽  
pp. 295-300 ◽  
Author(s):  
Cameron P McIntyre ◽  
Ernst Galutschek ◽  
Mark L Roberts ◽  
Karl F von Reden ◽  
Ann P McNichol ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Direct Analysis ◽  
Ion Source ◽  
Analytical Instruments ◽  
Acid Methyl ◽  
Microwave Ion Source ◽  
Mass Spectrometry System

Gas-accepting ion sources for radiocarbon accelerator mass spectrometry (AMS) have permitted the direct analysis of CO2 gas, eliminating the need to graphitize samples. As a result, a variety of analytical instruments can be interfaced to an AMS system, processing time is decreased, and smaller samples can be analyzed (albeit with lower precision). We have coupled a gas chromatograph to a compact 14C AMS system fitted with a microwave ion source for real-time compound-specific 14C analysis. As an initial test of the system, we have analyzed a sample of fatty acid methyl esters and biodiesel. Peak shape and memory was better then existing systems fitted with a hybrid ion source while precision was comparable. 14C/12C ratios of individual components at natural abundance levels were consistent with those determined by conventional methods. Continuing refinements to the ion source are expected to improve the performance and scope of the instrument.

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

Negative-Ion Implantation

1994 ◽  
Vol 354 ◽  
Author(s):  
Junzo Ishikawa
Keyword(s):  
Ion Implantation ◽  
Negative Ions ◽  
Ion Source ◽  
Negative Ion ◽  
Rf Plasma ◽  
Ion Currents ◽  
Promising Technique ◽  
Surface Charging ◽  
Silicon Carbon ◽  
A Charge

AbstractNegative-ion implantation is a promising technique for forthcoming ULSI (more than 256 M bits) fabrication and TFT (for color LCD) fabrication, since the surface charging voltage of insulated electrodes or insulators implanted by negative ions is found to saturate within so few as several volts, no breakdown of insulators would be expected without a charge neutralizer in these fabrication processes. Scatter-less negative-ion implantation into powders is also possible. For this purpose an rf-plasma-sputter type heavy negative-ion source was developed, which can deliver several milliamperes of various kinds of negative ion currents such as boron, phosphor, silicon, carbon, copper, oxygen, etc. A medium current negative-ion implanter with a small version of this type of ion source has been developed.

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.

Study on the energy distribution of ion beams extracted from the sputter-type negative-ion source

1996 ◽  
Author(s):  
Junzo Ishikawa ◽  
Hiroshi Tsuji ◽  
Takashi Takatori ◽  
Yasuhito Gotoh
Keyword(s):  
Energy Distribution ◽  
Ion Beams ◽  
Ion Source ◽  
Negative Ion
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