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Ion transmission studies of multiple-sector isotope-ratio mass spectrometers

Conference · · International Journal of Mass Spectrometry and Ion Processes
 [1];  [2]
  1. Pacific Northwest Laboratory (PNL), Richland, WA (United States)
  2. Purdue Univ., West Lafayette, IN (United States); Finnigan MAT GmbH, Bremen (Germany)
+ Show Author Affiliations
Theoretical and experimental studies were conducted to determine the ion transmission efficiency of multiple-sector isotope-ratio mass spectrometers with tandem magnets of normal geometry. The computer program GIOS (general ion optical systems) was used to perform theoretical calculations of focusing properties and ion transmission efficiency. Actual transmission through multiple-sector instruments was determined from measurements of the ion beam vertical profile at the focus of each sector. Transmission was found to be strongly dependent on source filament geometry. The studies also determined a way to significantly increase ion transmission without changing the basic geometry of existing instruments. A cylindrical einzel lens located near the focus between the magnets provides vertical focusing of the ion beam without perturbing focal properties in the plane of mass dispersion. With a single V-filament ion source, a transmission increase from ≈ 75% to ≈ 100% was achieved.
Research Organization:
Pacific Northwest Laboratory (PNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC06-76RL01830
OSTI ID:
5738056
Report Number(s):
PNL-SA--19175; CONF-9105216--1; ON: DE91014253
Conference Information:
Journal Name: International Journal of Mass Spectrometry and Ion Processes Journal Issue: 1-2 Journal Volume: 114
Country of Publication:
United States
Language:
English

References (11)

Surface ionization — the rhenium V-type single filament journal October 1969
Plutonium ion emission from carburized rhenium mass spectrometer filaments journal January 1985
Transmission Optics of Focused Ion Beams Used in Mass Spectrometry journal November 1960
Multiple-sector isotope-ratio mass spectrometer design for high transmission efficiency journal April 1991
Design charts of electrostatic three-aperture lenses journal June 1974
A computer-controlled, three-stage mass spectrometer journal March 1970
Ion Optics for the V-Type Surface Ionization Filament Used in Mass Spectrometry journal April 1959
Fabrication of V-type filaments for surface ionization mass spectrometry journal January 1984
A Two Stage Magnetic Analyzer for Isotopic Ratio Determinations of 104 to 1 or Greater journal November 1954
A Three Stage Mass Spectrometer journal May 1958
The use of an electrostatic quadrupole as a field lens in a double-focusing mass spectrometer journal May 1985

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Related Subjects

440800* -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
640301 -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BATTELLE PACIFIC NORTHWEST LABORATORIES
BEAM FOCUSING MAGNETS
BEAMS
DESIGN
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELECTROSTATIC LENSES
EQUIPMENT
ION BEAMS
LENSES
MAGNETS
MASS SPECTROMETERS
MEASURING INSTRUMENTS
NATIONAL ORGANIZATIONS
SPECTROMETERS
TRANSMISSION
US DOE
US ERDA
US ORGANIZATIONS