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Mass spectrometers
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Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006651
EISBN: 978-1-62708-213-6
Abstract
This article endeavors to familiarize the reader with a selection of different ionization designs and instrument components to provide knowledge for sorting the various analytical strategies in the field of solid analysis by mass spectrometry (MS). It begins with a description of the general principles of MS. This is followed by sections providing a basic understanding of instrumentation and discussing the operating requirements as well as practical considerations related to solid sample analysis by MS. Instrumentation discussed include the triple quadrupole mass spectrometer and the time-of-flight mass spectrometer. Inductively coupled plasma and thermal ionization MS provide atomic information, and direct analysis in real-time and matrix-assisted laser-desorption ionization MS are used to analyze molecular compositions. The article describes various factors pertinent to ionization methods, namely glow discharge mass spectrometry and secondary ion mass spectrometry. It concludes with a section on various examples of applications and interpretation of MS for various materials.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003229
EISBN: 978-1-62708-199-3
Abstract
Leak testing is used to determine the rate at which a liquid or gas penetrates from inside a component or assembly to the outside, or vice versa. This article discusses the type of leaks, namely real leaks, and virtual leaks. It describes the leak testing of fluid systems at pressure through acoustic method and bubble testing. The article gives a short note on types of leak detectors, sulfur hexafluoride detectors and mass-spectrometer. It tabulates the pressure and vacuum system leak-testing methods and discusses the application of gas detectors in leak testing.
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001776
EISBN: 978-1-62708-178-8
Abstract
Gas chromatography/mass spectrometry (GC/MS) is useful in analyzing mixtures of organic compounds. This article commences with a description of the principles of mass spectrometry and gas chromatography. It provides information on the procedures of mass spectrum interpretation, and describes the experimental procedure of and sample preparation for GC/MS. The article also discusses complementary techniques, such as high-performance liquid chromatography/mass spectrometry and mass spectrometry/mass spectrometry, and concludes with the applications of GC/MS.
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001738
EISBN: 978-1-62708-178-8
Abstract
Gas analysis by mass spectrometry, or gas mass spectrometry, is a useful analytical tool for investigations performed in controlled atmospheres or in vacuum. This article provides sufficient information to determine if gas mass spectrometry can produce the data required and to determine the type of instrument necessary for a particular application. It discusses the working operations of gas mass spectrometer components, namely, the introduction system, ion sources, mass analyzers, and the ion detector. The article also provides information on resolution of a gas mass spectrometer determined by the width of the source slit and the collector slit. Finally, it describes the instrument set-up for gas mass spectrometry, and shows how to analyze the test results of gas mass spectrometry.