scholarly journals AN ELECTRON MULTIPLIER AS A DETECTOR FOR A SURFACE IONIZATION MASS SPECTROMETER--DESIGN

1960 ◽  
Author(s):  
L. Cathey
Keyword(s):  
Mass Spectrometer ◽  
Surface Ionization ◽  
Ionization Mass ◽  
Electron Multiplier

THE NATURAL ABUNDANCES OF THE URANIUM ISOTOPES

1956 ◽  
Vol 34 (3) ◽  
pp. 259-264 ◽  
Author(s):  
M. Lounsbury
Keyword(s):  
Mass Spectrometer ◽  
Abundance Ratio ◽  
Uranium Isotopes ◽  
Surface Ionization ◽  
Ionization Mass ◽  
Bear Lake ◽  
Best Value ◽  
Isotopic Abundances

Using a surface-ionization mass spectrometer, the natural U238/U235 abundance ratio in uranium obtained from Great Bear Lake Pitchblende has been measured to be 137.80 ± 0.14. From a survey of results reported in the literature on U234 a best value of 17,325 ± 550 was estimated for the natural U238/U234 abundance ratio. The corresponding isotopic abundances are 0.7204 ± 0.0007 atom % and 0.00573 ± 0.00018 atom % for U235 and U234, respectively.

Surface Ionization Mass Spectrometer for Production Control

1957 ◽  
Vol 29 (11) ◽  
pp. 1593-1595 ◽  
Author(s):  
M. W. Echo ◽  
T. D. Morgan
Keyword(s):  
Mass Spectrometer ◽  
Production Control ◽  
Surface Ionization ◽  
Ionization Mass

Sequential Sample Changer for Surface-Ionization Mass Spectrometer

1966 ◽  
Vol 20 (1) ◽  
pp. 40-43 ◽  
Author(s):  
M. D. Lubin ◽  
K. O. Hamby ◽  
K. D. Rosenlof ◽  
E. Gieszelmann
Keyword(s):  
Mass Spectrometer ◽  
Surface Ionization ◽  
Ionization Mass ◽  
Sample Changer ◽  
Sequential Sample

A three-station sequential sample changer has been built for a surface-ionization mass spectrometer used in the analysis of nanogram-sized samples. During the analysis of a sample, the previously analyzed sample is replaced and the next sample to be analyzed is preheated. The delay between completion of one analysis and start of the next is reduced to 1 min or less.

scholarly journals A chemical ionization mass spectrometer for continuous underway shipboard analysis of dimethylsulfide in near-surface seawater

Ocean Science ◽  
2009 ◽  
Vol 5 (4) ◽  
pp. 537-546 ◽  
Author(s):  
E. S. Saltzman ◽  
W. J. De Bruyn ◽  
M. J. Lawler ◽  
C. A. Marandino ◽  
C. A. McCormick
Keyword(s):  
Mass Spectrometer ◽  
Atmospheric Pressure ◽  
Chemical Ionization ◽  
Atmospheric Pressure Chemical Ionization ◽  
Low Cost ◽  
Full Range ◽  
Internal Standard ◽  
Ionization Mass ◽  
Electron Multiplier ◽  
Near Surface

Abstract. A compact, low-cost atmospheric pressure, chemical ionization mass spectrometer ("mini-CIMS") has been developed for continuous underway shipboard measurements of dimethylsulfide (DMS) in seawater. The instrument was used to analyze DMS in air equilibrated with flowing seawater across a porous Teflon membrane equilibrator. The equilibrated gas stream was diluted with air containing an isotopically-labeled internal standard. DMS is ionized at atmospheric pressure via proton transfer from water vapor, then declustered, mass filtered via quadrupole mass spectrometry, and detected with an electron multiplier. The instrument described here is based on a low-cost residual gas analyzer (Stanford Research Systems), which has been modified for use as a chemical ionization mass spectrometer. The mini-CIMS has a gas phase detection limit of 220 ppt DMS for a 1 min averaging time, which is roughly equivalent to a seawater DMS concentration of 0.1 nM DMS at 20°C. The mini-CIMS has the sensitivity, selectivity, and time response required for underway measurements of surface ocean DMS over the full range of oceanographic conditions. The simple, robust design and relatively low cost of the instrument are intended to facilitate use in process studies and surveys, with potential for long-term deployment on research vessels, ships of opportunity, and large buoys.

scholarly journals A chemical ionization mass spectrometer for continuous underway shipboard analysis of dimethylsulfide in near-surface seawater

2009 ◽  
Vol 6 (2) ◽  
pp. 1569-1594
Author(s):  
E. S. Saltzman ◽  
W. J. De Bruyn ◽  
M. J. Lawler ◽  
C. A. Marandino ◽  
C. A. McCormick
Keyword(s):  
Mass Spectrometer ◽  
Atmospheric Pressure ◽  
Chemical Ionization ◽  
Atmospheric Pressure Chemical Ionization ◽  
Low Cost ◽  
Full Range ◽  
Internal Standard ◽  
Ionization Mass ◽  
Electron Multiplier ◽  
Near Surface

Abstract. A compact, low-cost atmospheric pressure, chemical ionization mass spectrometer ("mini-CIMS") has been developed for continuous underway shipboard measurements of dimethylsulfide (DMS) in seawater. The instrument was used to analyze DMS in air equilibrated with flowing seawater across a porous Teflon membrane equilibrator. The equilibrated gas stream was diluted with air containing an isotopically-labeled internal standard. DMS is ionized at atmospheric pressure via proton transfer from water vapor, then declustered, mass filtered via quadrupole mass spectrometry, and detected with an electron multiplier. The instrument described here is based on a low-cost residual gas analyzer (Stanford Research Systems), which has been modified for use as a chemical ionization mass spectrometer. The mini-CIMS has a gas phase detection limit of 170 ppt DMS for a 1 min averaging time, which is roughly equivalent to a seawater DMS concentration of 0.1 nM DMS at 20°C. The mini-CIMS has the sensitivity, selectivity, and time response required for underway measurements of surface ocean DMS over the full range of oceanographic conditions. The simple, robust design and relatively low cost of the instrument are intended to facilitate use in process studies and surveys, with potential for long-term deployment on research vessels, ships of opportunity, and large buoys.

scholarly journals Isotopic Composition of Lithium in Carbonaceous Chondrites Measured by a Modified Type Surface Ionization Mass Spectrometer.

2000 ◽  
Vol 48 (4) ◽  
pp. 275-283 ◽  
Author(s):  
Tomoe HATAKEYAMA ◽  
Keiji HISAYOSHI ◽  
Mamoru MURATA ◽  
Hiroaki OZAWA ◽  
Takeshi KOZAI ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Mass Spectrometer ◽  
Surface Ionization ◽  
Ionization Mass ◽  
Carbonaceous Chondrites
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