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Title: Method for calibrating mass spectrometers

Abstract

A method whereby a mass spectra generated by a mass spectrometer is calibrated by shifting the parameters used by the spectrometer to assign masses to the spectra in a manner which reconciles the signal of ions within the spectra having equal mass but differing charge states, or by reconciling ions having known differences in mass to relative values consistent with those known differences. In this manner, the mass spectrometer is calibrated without the need for standards while allowing the generation of a highly accurate mass spectra by the instrument.

Inventors:
 [1];  [2];  [3];  [2];  [2]
  1. Benton City, WA
  2. Richland, WA
  3. Schwenksville, PA
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
874962
Patent Number(s):
6,498,340
Assignee:
Battelle Memorial Institute (Richland, WA) PNNL
DOE Contract Number:
AC06-76RL01830
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; calibrating; mass; spectrometers; spectra; generated; spectrometer; calibrated; shifting; parameters; masses; manner; reconciles; signal; equal; differing; charge; reconciling; differences; values; consistent; standards; allowing; generation; highly; accurate; instrument; mass spectrometer; /250/

Citation Formats

Anderson, Gordon A, Brands, Michael D, Bruce, James E, Pasa-Tolic, Ljiljana, and Smith, Richard D. Method for calibrating mass spectrometers. United States: N. p., 2002. Web.
Anderson, Gordon A, Brands, Michael D, Bruce, James E, Pasa-Tolic, Ljiljana, & Smith, Richard D. Method for calibrating mass spectrometers. United States.
Anderson, Gordon A, Brands, Michael D, Bruce, James E, Pasa-Tolic, Ljiljana, and Smith, Richard D. Tue . "Method for calibrating mass spectrometers". United States. doi:. https://www.osti.gov/servlets/purl/874962.
@article{osti_874962,
title = {Method for calibrating mass spectrometers},
author = {Anderson, Gordon A and Brands, Michael D and Bruce, James E and Pasa-Tolic, Ljiljana and Smith, Richard D},
abstractNote = {A method whereby a mass spectra generated by a mass spectrometer is calibrated by shifting the parameters used by the spectrometer to assign masses to the spectra in a manner which reconciles the signal of ions within the spectra having equal mass but differing charge states, or by reconciling ions having known differences in mass to relative values consistent with those known differences. In this manner, the mass spectrometer is calibrated without the need for standards while allowing the generation of a highly accurate mass spectra by the instrument.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 24 00:00:00 EST 2002},
month = {Tue Dec 24 00:00:00 EST 2002}
}

Patent:

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  • A method for improving the calibration of a Fourier transform ion cyclotron resonance mass spectrometer wherein the frequency spectrum of a sample has been measured and the frequency (f) and intensity (I) of at least three species having known mass to charge (m/z) ratios and one specie having an unknown (m/z) ratio have been identified. The method uses the known (m/z) ratios, frequencies, and intensities at least three species to calculate coefficients A, B, and C, wherein the mass to charge ratio of a least one of the three species (m/z).sub.i is equal to ##EQU1## wherein f.sub.i is the detectedmore » frequency of the specie, G(I.sub.i) is a predetermined function of the intensity of the species, and Q is a predetermined exponent. Using the calculated values for A, B, and C, the mass to charge ratio of the unknown specie (m/z).sub.ii is calculated as the sum of ##EQU2## wherein f.sub.ii is the measured frequency of the unknown specie, and (I.sub.ii) is the measured intensity of the unknown specie.« less
  • A method for enhancing the dynamic range of a mass spectrometer by first passing a sample of ions through the mass spectrometer having a quadrupole ion filter, whereupon the intensities of the mass spectrum of the sample are measured. From the mass spectrum, ions within this sample are then identified for subsequent ejection. As further sampling introduces more ions into the mass spectrometer, the appropriate rf voltages are applied to a quadrupole ion filter, thereby selectively ejecting the undesired ions previously identified. In this manner, the desired ions may be collected for longer periods of time in an ion trap,more » thus allowing better collection and subsequent analysis of the desired ions. The ion trap used for accumulation may be the same ion trap used for mass analysis, in which case the mass analysis is performed directly, or it may be an intermediate trap. In the case where collection is an intermediate trap, the desired ions are accumulated in the intermediate trap, and then transferred to a separate mass analyzer. The present invention finds particular utility where the mass analysis is performed in an ion trap mass spectrometer or a Fourier transform ion cyclotron resonance mass spectrometer.« less
  • The invention discloses a method and apparatus for calibrating particulate emissions monitors, in particular, sampling probes, and in general, without removing the instrument from the system being monitored. A source of one or more specific metals in aerosol (either solid or liquid) or vapor form is housed in the instrument. The calibration operation is initiated by moving a focusing lens, used to focus a light beam onto an analysis location and collect the output light response, from an operating position to a calibration position such that the focal point of the focusing lens is now within a calibration stream issuingmore » from a calibration source. The output light response from the calibration stream can be compared to that derived from an analysis location in the operating position to more accurately monitor emissions within the emissions flow stream. 6 figs.« less