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Mass spectrum. Electron ionization mass spectrum of toluene [1]. Note parent peak corresponding to molecular mass M = 92 (C 7 H 8+) and highest peak at M-1 = 91 (C 7 H 7+, quasi-stable tropylium cation). A mass spectrum is a histogram plot of intensity vs. mass-to-charge ratio (m/z) in a chemical sample, [1] usually acquired using an instrument ...
An infrared spectroscopy correlation table (or table of infrared absorption frequencies) is a list of absorption peaks and frequencies, typically reported in wavenumber, for common types of molecular bonds and functional groups. [ 1 ][ 2 ] In physical and analytical chemistry, infrared spectroscopy (IR spectroscopy) is a technique used to ...
Appearance. Mass spectrometry (MS) is an analytical technique that is used to measure the mass-to-charge ratio of ions. The results are presented as a mass spectrum, a plot of intensity as a function of the mass-to-charge ratio. Mass spectrometry is used in many different fields and is applied to pure samples as well as complex mixtures.
The Kendrick mass is defined by setting the mass of a chosen molecular fragment, typically CH 2, to an integer value in amu (atomic mass units). It is different from the IUPAC definition, which is based on setting the mass of 12 C isotope to exactly 12 amu. The Kendrick mass is often used to identify homologous compounds differing only by a ...
Mass chromatogram. A mass chromatogram is a representation of mass spectrometry data as a chromatogram, where the x-axis represents time and the y-axis represents signal intensity. [1] The source data contains mass information; however, it is not graphically represented in a mass chromatogram in favor of visualizing signal intensity versus time.
A triple quadrupole mass spectrometer (TQMS), is a tandem mass spectrometer consisting of two quadrupole mass analyzers in series, with a (non-mass-resolving) radio frequency (RF)–only quadrupole between them to act as a cell for collision-induced dissociation. This configuration is often abbreviated QqQ, here Q 1 q 2 Q 3.
Proprietary. AnalyzerPro is a vendor-independent software application from SpectralWorks for processing mass spectrometry data. It can process both GC-MS and LC-MS data using qualitative and quantitative data processing and is used in metabolomics with MatrixAnalyzer for the comparison of multiple data sets.
mass spectrometry. Isotope-ratio mass spectrometry (IRMS) is a specialization of mass spectrometry, in which mass spectrometric methods are used to measure the relative abundance of isotopes in a given sample. [1][2] This technique has two different applications in the earth and environmental sciences. The analysis of ' stable isotopes ' is ...