Electron ionization mass spectrum of toluene [1]. Note parent peak corresponding to molecular mass M = 92 (C7H8+) and highest peak at M-1 = 91 (C7H7+, 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 called a mass spectrometer. Not all mass spectra of a given substance are the same; for example, some mass spectrometers break the analyte molecules into fragments; others observe the intact molecular masses with little fragmentation. A mass spectrum can represent many different types of information based on the type of mass spectrometer and the specific experiment applied. Common fragmentation processes for organic molecules are the McLafferty rearrangement and alpha cleavage. Straight chain alkanes and alkyl groups produce a typical series of peaks: 29 (CH3CH2+), 43 (CH3CH2CH2+), 57 (CH3CH2CH2CH2+), 71 (CH3CH2CH2CH2CH2+) etc.[2]
^IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "mass spectrum". doi:10.1351/goldbook.M03749
^Turecek, František; McLafferty, Fred W. (1993). Interpretation of mass spectra. Sausalito, Calif: University Science Books. pp. 226-. ISBN 0-935702-25-3.
A massspectrum is a histogram plot of intensity vs. mass-to-charge ratio (m/z) in a chemical sample, usually acquired using an instrument called a mass...
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...
variable, such as energy in electron spectroscopy or mass-to-charge ratio in mass spectrometry. Spectrum is also used to refer to a graphical representation...
mass in a homologous series. In the spectrum for toluene for example, the molecular ion peak is located at 92 m/z corresponding to its molecular mass...
may represent, depending on what information is extracted from each massspectrum. The total ion current (TIC) chromatogram represents the summed intensity...
monoisotopic mass is observable as an isotopically pure peak in a massspectrum. This differs from the nominal molecular mass, which is the sum of the mass number...
can be gained from the simple massspectrum obtained. This disadvantage can be overcome by coupling ESI with tandem mass spectrometry (ESI-MS/MS). Another...
scan and a parent ion scan of the entire spectrum. Each instrumental configuration utilizes a unique mode of mass identification. When tandem MS is performed...
The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate...
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antibiotics, extended-spectrum antibiotics and narrow-spectrum antibiotics based on their spectrum of activity. Detailedly, broad-spectrum antibiotics can kill...
measure individual narrow bands of color, called a spectrum. A mass spectrometer measures the spectrum of the masses of the atoms or molecules present in...
to a massspectrum by first using the Fourier transform of time domain of the harmonic to create a frequency signal which is converted to mass. The concept...
of peaks in a chromatogram Resolution (mass spectrometry), the ability to distinguish peaks in a massspectrum Spatial resolution, the pixel width on...
conversion Chemical name to structure conversion NMR spectrum simulation (1H and 13C) Massspectrum simulation Structure cleanup Draw ligand Structure An...
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