RF-GD/FTMS: An FTMS system with a lensless external ion source for high resolution elemental mass spectrometry

Conference · Tue Jan 01 00:00:00 EST 1991

OSTI ID:5221442

Weller, R R; Pochkowski, J M ^[1]; Duckworth, D C; Marcus, R K ^[2]; Buchanan, M V ^[3]

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1. Westinghouse Savannah River Co., Aiken, SC (United States)
2. Clemson Univ., SC (United States). Dept. of Chemistry
3. Oak Ridge National Lab., TN (United States)

Two of the major challenges which face the field of elemental mass spectrometry are the development of versatile atomization/ionization sources for direct solids analysis and methods for reducing the impact of isobaric interferences found on commonly employed quadrupole and sector based instruments. The combination of radio frequency glow discharge (RF-GD) sources with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR or FTMS) is one technique which addresses both problems. A demonstration project was conducted at ORNL where an external RF-GD ion source was coupled to a commercial FTMS instrument. The ion transfer system utilized the lensless method developed by Weller, et al for laser desorbed ions. The RF-GD source was contained in a 2.75in. CF cross and separated from the main vacuum system by a skimmer cone. An intermediate differential pumping chamber was separated from the FTMS pumping system. The differential pumping chamber attached directly to the analyzer'' flange. Large ion signals could easily be obtained without complex trapping schemes which produced mass spectra with excellent signal-to-noise ratios and resolving powers. Resolutions were limited by the pressure at the analyzer cell. The NIST 1103 Brass sample shows good ratios for the Cu and Zn components. Expected peaks are observed for the Ar+ and ArH+ species. Minor components down to around 1% are observable without any ion ejection techniques. The NIST 1263 Steel sample demonstrates the moderate resolution attainable even with the high pressures in the ICR analyzer cell. This document is an extended abstract with viewgraphs.

• Research Organization: Westinghouse Savannah River Co., Aiken, SC (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC09-89SR18035
• OSTI ID: 5221442
• Report Number(s): WSRC-MS-91-521; CONF-9205196-1; ON: DE92015343
• Resource Relation: Conference: 40. ASMS conference on mass spectrometry and allied topics, Washington, DC (United States), 31 May - 2 Jun 1992
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
42 ENGINEERING
FOURIER TRANSFORM SPECTROMETERS
DESIGN
MASS SPECTROMETERS
BRASS
GLOW DISCHARGES
ION SOURCES
RESONANCE IONIZATION MASS SPECTROSCOPY
SUPERCONDUCTING MAGNETS
VACUUM SYSTEMS
VALVES
ALLOYS
CONTROL EQUIPMENT
COPPER ALLOYS
COPPER BASE ALLOYS
ELECTRIC DISCHARGES
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
FLOW REGULATORS
MAGNETS
MASS SPECTROSCOPY
MEASURING INSTRUMENTS
SPECTROMETERS
SPECTROSCOPY
SUPERCONDUCTING DEVICES
ZINC ALLOYS
440800* - Miscellaneous Instrumentation- (1990-)
426000 - Engineering- Components
Electron Devices & Circuits- (1990-)