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Efficient mass calibration of magnetic sector mass spectrometers

Abstract

Magnetic sector mass spectrometers used for automatic acquisition of precise isotopic data are usually controlled with Hall probes and software that uses polynomial equations to define and calibrate the mass-field relations required for mass focusing. This procedure requires a number of reference masses and careful tuning to define and maintain an accurate mass calibration. A simplified equation is presented and applied to several different magnetically controlled mass spectrometers. The equation accounts for nonlinearity in typical Hall probe controlled mass-field relations, reduces calibration to a linear fitting procedure, and is sufficiently accurate to permit calibration over a mass range of 2 to 200 amu with only two defining masses. Procedures developed can quickly correct for normal drift in calibrations and compensate for drift during isotopic analysis over a limited mass range such as a single element. The equation is: Field A{center_dot}Mass{sup 1/2} + B{center_dot}(Mass){sup p} where A, B, and p are constants. The power value p has a characteristic value for a Hall probe/controller and is insensitive to changing conditions, thus reducing calibration to a linear regression to determine optimum A and B. (author). 1 ref., 1 tab., 6 figs.
Authors:
Publication Date:
Dec 31, 1996
Product Type:
Miscellaneous
Report Number:
INIS-CA-0007
Reference Number:
SCA: 400101; PA: AIX-28:056343; EDB-97:118972; SN: 97001840817
Resource Relation:
Other Information: PBD: 1996; Related Information: Is Part Of Radiogenic age and isotopic studies: report 9. Current research 1995-F; PB: 83 p.
Subject:
40 CHEMISTRY; MASS SPECTROMETERS; CALIBRATION; ISOTOPE RATIO; ION BEAMS; MAGNETIC FIELDS; POLYNOMIALS
OSTI ID:
517285
Research Organizations:
Geological Survey of Canada, Ottawa, ON (Canada)
Country of Origin:
Canada
Language:
English
Other Identifying Numbers:
Other: ON: DE97638269; ISBN 0-662-16431-0; TRN: CA9700380056343
Availability:
INIS; OSTI as DE97638269
Submitting Site:
INIS
Size:
pp. 1-9
Announcement Date:

Citation Formats

Roddick, J C. Efficient mass calibration of magnetic sector mass spectrometers. Canada: N. p., 1996. Web.
Roddick, J C. Efficient mass calibration of magnetic sector mass spectrometers. Canada.
Roddick, J C. 1996. "Efficient mass calibration of magnetic sector mass spectrometers." Canada.
@misc{etde_517285,
title = {Efficient mass calibration of magnetic sector mass spectrometers}
author = {Roddick, J C}
abstractNote = {Magnetic sector mass spectrometers used for automatic acquisition of precise isotopic data are usually controlled with Hall probes and software that uses polynomial equations to define and calibrate the mass-field relations required for mass focusing. This procedure requires a number of reference masses and careful tuning to define and maintain an accurate mass calibration. A simplified equation is presented and applied to several different magnetically controlled mass spectrometers. The equation accounts for nonlinearity in typical Hall probe controlled mass-field relations, reduces calibration to a linear fitting procedure, and is sufficiently accurate to permit calibration over a mass range of 2 to 200 amu with only two defining masses. Procedures developed can quickly correct for normal drift in calibrations and compensate for drift during isotopic analysis over a limited mass range such as a single element. The equation is: Field A{center_dot}Mass{sup 1/2} + B{center_dot}(Mass){sup p} where A, B, and p are constants. The power value p has a characteristic value for a Hall probe/controller and is insensitive to changing conditions, thus reducing calibration to a linear regression to determine optimum A and B. (author). 1 ref., 1 tab., 6 figs.}
place = {Canada}
year = {1996}
month = {Dec}
}