mass spectrum


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mass spectrum

[′mas ′spek·trəm]
(particle physics)
A plot of masses of elementary particles, including unstable states. Also known as particle spectrum.
(physics)
A display, record, or plot of the distribution in mass, or in mass-to-charge ratio, of ionized atoms, molecules, or molecular fragments.
References in periodicals archive ?
This approach has significant technical challenges, in that not all resistance factors lead to recognizable ion fragments in a whole bacteria MALDI-TOF experiment; and the ones that do can, of course, undergo genetic changes which may or may not impact the antibiotic resistance phenotype but can alter the appearance of the mass spectrum.
Reading chemical fine print: Resolution and identification of 3000 nitrogen-containing aromatic compounds from a single electrospray ionization Fourier transform ion cyclotron resonance mass spectrum of heavy petroleum crude oil.
A mass spectrum is generated and represents the numbers of ions hitting the detector at the end of the flight tube at a specific time (time of flight).
The frequency spectrum (7) and the mass spectrum (10) are isomorphic.
This is further confirmed by the presence of peaks at 14 mass units apart in the mass spectrum of compound (2).
The top mass spectrum in Figure 13 shows the high mass portion of the mass spectrum from the surface of an automotive clearcoat containing no additives.
The sample was analyzed by electro-spray mass spectrometry, LCQ-Deca, and the resulting spectrum was compared to that of a control mass spectrum of cytochrome C.
Thus, the mass spectrometer acquires a "survey" mass spectrum, followed by tandem mass spectra (MS/MS spectra) of precursor ions identified in the earlier survey mass spectrum.
Matrix assisted laser desorption ionization/time-of-flight-mass spectrometry is then used to produce a mass spectrum that is analyzed to determine if one or more proteins associated with the bacteriophage are present, thereby indirectly indicating that target bacterium were present in the liquid mixture.