Optimization of mass spectrometer ion yields by electron energy selection and cryogenic trapping of contaminants for the pulse-heated vaporization of metal atoms

1973 ◽  
Vol 45 (8) ◽  
pp. 1438-1442 ◽  
Author(s):  
J. M. Freese ◽  
A. W. Lynch ◽  
R. T. Meyer
Keyword(s):  
Electron Energy ◽  
Mass Spectrometer ◽  
Metal Atoms ◽  
Cryogenic Trapping ◽  
Ion Yields

Drei Verfahren zur Messung der Änderung der Austrittsarbeit mit Hilfe der Oberflächenionisation

1972 ◽  
Vol 27 (5) ◽  
pp. 794-803 ◽  
Author(s):  
R Müller ◽  
W Walcher ◽  
H.-W Wassmuth
Keyword(s):  
Work Function ◽  
Mass Spectrometer ◽  
Reference Electrode ◽  
Surface Ionization ◽  
Contact Potential ◽  
External Voltage ◽  
The Third ◽  
Metal Atoms ◽  
Ion Emission

AbstractThree methods for the measurement of the change ΔΦ of the work function Φ of a metal surface due to the presence of adsorbed particles (e. g. oxygen) have been developed utilizing the surface ionization of a beam of metal atoms (e. g. In, Sr) as a probe. The experiments have been performed with a mass spectrometer at ultrahigh vacuum.In the first method the temperature dependency of the ion emission current is used for the determination of the work function Φ considering certain limiting conditions. The two other methods which may be applied simultaneously with the first one, involve a direct measurement of ΔΦ by compensating the change of the contact potential by an external voltage: In the second method the contact potential between the ionizing surface and a surrounding reference electrode is used to control the ion optical conditions for the ion emission, whereas in the third method the change in the kinetic energy of the ions caused by a change of the contact potential between the ionizing surface and the entrance slit of the mass spectrometer is used as a measure of ΔΦ

scholarly journals Automatic AMS Sample Combustion and CO2 Collection

Radiocarbon ◽  
2001 ◽  
Vol 43 (2A) ◽  
pp. 293-298 ◽  
Author(s):  
A T Aerts-Bijma ◽  
J van der Plicht ◽  
H A J Meijer
Keyword(s):  
Mass Spectrometry ◽  
Memory Effect ◽  
Mass Spectrometer ◽  
Accelerator Mass Spectrometry ◽  
Isotope Ratio ◽  
Memory Effects ◽  
Isotope Ratio Mass Spectrometer ◽  
Cryogenic Trapping ◽  
Co2 Collection

In Groningen, all organic samples for accelerator mass spectrometry (AMS) are combusted in an automatic Elemental Analyzer, coupled to an Isotope Ratio Mass Spectrometer and Cryogenic Trapping System. The Gas Chromatographic (GC) column, part of the Elemental Analyzer system, appeared to be the main cause for memory effects. Therefore we modified the Elemental Analyzer, such that the trapped CO2 no longer passed the GC column. Our system modification reduced the memory effect significantly, as shown by lower radiocarbon concentration values for anthracite backgrounds, and a much smaller spread in these values. Our modified system can perform up to 40 combustions unattended in about 6 hr.

Theoretical Penning electron-energy distributions for alkali-metal atoms: He(21,3S) collisions with sodium and potassium

1989 ◽  
Vol 40 (1) ◽  
pp. 117-124 ◽  
Author(s):  
N. T. Padial ◽  
James S. Cohen ◽  
Richard L. Martin ◽  
Neal F. Lane
Keyword(s):  
Alkali Metal ◽  
Electron Energy ◽  
Energy Distributions ◽  
Metal Atoms ◽  
Sodium And Potassium

scholarly journals Probing Surface Information of Alloy by Time of Flight-Secondary Ion Mass Spectrometer

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1465
Author(s):  
Tinglu Song ◽  
Meishuai Zou ◽  
Defeng Lu ◽  
Hanyuan Chen ◽  
Benpeng Wang ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Crystal Orientation ◽  
Mass Spectra ◽  
Time Of Flight ◽  
Surface Characteristic ◽  
Alloy Surface ◽  
Surface Information ◽  
Tof Sims ◽  
Ion Yields ◽  
Secondary Ion

In recent years, time of flight-secondary ion mass spectrometer (ToF-SIMS) has been widely employed to acquire surface information of materials. Here, we investigated the alloy surface by combining the mass spectra and 2D mapping images of ToF-SIMS. We found by surprise that these two results seem to be inconsistent with each other. Therefore, other surface characteristic tools such as SEM-EDS were further used to provide additional supports. The results indicated that such differences may originate from the variance of secondary ion yields, which might be affected by crystal orientation.

scholarly journals Integrating Continuous-Flow Mass Spectrometry and Automatic CO2 Collection for AMS

Radiocarbon ◽  
2007 ◽  
Vol 49 (2) ◽  
pp. 233-244 ◽  
Author(s):  
Jesper Olsen ◽  
Jan Heinemeier ◽  
Klaus Bahner ◽  
Barry Graney ◽  
Andy Phillips
Keyword(s):  
Mass Spectrometry ◽  
Stable Isotope ◽  
High Precision ◽  
Mass Spectrometer ◽  
Stable Isotope Analysis ◽  
Computer Control ◽  
Isotope Analysis ◽  
Carbon And Nitrogen ◽  
Cryogenic Trapping ◽  
Inlet Manifold

Accelerator mass spectrometry (AMS) radiocarbon measurements of organic samples require combustion to obtain CO2 for graphitization. Furthermore, determination of δ13C values is required in order to correct the 14C age due to carbon isotope fractionation effects. δ13C analysis is commonly carried out by stable isotope mass spectrometry because most applications demand high-precision δ13C values in addition to the requirements of 14C dating. A simplifying step is therefore to combine the combustion for stable isotope analysis with cryogenic trapping of CO2 for AMS graphite targets. Presented here is a simple CO2 trapping device based on a modified Gilson 220XL sampling (manifold) robot coupled to the inlet manifold system of a GV Instruments IsoPrime stable isotope mass spectrometer. The system is capable of batch combustion and analysis of up to 40 samples and is under full computer control by the mass spectrometer software. All trapping parameters such as flush time prior to trapping and total trap time are adjustable through the standard software user interface. A low 14C activity of background materials and high precision and accuracy of stable isotope analysis of carbon and nitrogen are demonstrated.

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