The Lamont-Doherty-Geological-Observatory Isolab-54 Isotope Ratio Mass-Spectrometer

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
1992
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Journal Title: 
International Journal of Mass Spectrometry and Ion Processes
Journal Date: 
Dec 1
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Volume: 
121
Issue: 
3
Pages: 
201-240
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Publisher: 
ISBN Number: 
0168-1176
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Edition: 
Short Title: 
Accession Number: 
ISI:A1992KE57900003
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Abstract: 

The Lamont-Doherty Geological Observatory (LDGO) Isolab 54 is a double focussing isotope ratio mass spectrometer that allows the measurement of thermal ions produced on a hot filament, (thermal-ionization mass spectrometry (TIMS)), secondary ions produced by sputtering a sample using a primary ion beam, (secondary ion mass spectrometry (SIMS)), and sputtered neutrals resonantly ionized using laser radiation, (sputter-induced resonance ionization mass spectrometry (SIRIMS)). Sputtering is carried out using an Ar primary beam generated in a duoplasmatron and focussed onto the sample using a two-lens column. Resonance ionization is accomplished using a frequency-doubled dye laser pumped by an excimer laser.The Isolab's forward geometry analyzer, consisting of an electrostatic followed by a magnetic sector, allows the simultaneous collection of different isotopes of the same element. This instrument is the first to have a multicollector that contains an ion-counting system based on a microchannel plate as well as traditional Faraday cups. A second electrostatic sector after the multicollector is equipped with an ion-counting Daly detector to allow high abundance sensitivity for measurements of large dynamics range. Selectable source, collector, alpha and energy slits on the instrument allow analyses to be made over a range of mass resolving powers and analyzer acceptances.Recent applications of the instrument have included the analyses of U by TIMS, Hf, Th and Re by SIMS and Re and Os by SIRIMS.

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