mass spectrum

(redirected from Mass spectra)
Also found in: Dictionary, Thesaurus, Medical.
Related to Mass spectra: mass spectrometry

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 ?
Figure 3 shows the relative abundance of the basic classes identified from the positive-ion ESI FT-ICR mass spectra of four samples of shale oil at a heating rate of 5-20 [degrees]C [min.
Recent advances in mass spectrometry have facilitated the routine acquisition of mass spectra at high resolution with sufficient resolution and peak capacity to handle the complexity of the mixture with only a single dimension of chromatographic separation.
cereus) and served as an internal standard allowing comparison between mass spectra in this study and previous ones.
Mass spectra were obtained scanning in the range m/z 600-900.
Fast atom bombardment (FAB) mass spectra of each of the trinuclear 4,4'-bipyridine complexes as acetonitrile solutions display a distinctive set of ions with masses corresponding to the series [[Cr.
Mass spectra and LRI were obtained for identification, and external standards were used for quantification.
The mass spectra of the only characterized alkaloids ([M.
The software's ability to deconvolve mass spectra in the presence of high noise levels and co-elutants permits the use of extremely short and simple GC temperature programmes, and virtually eliminates the need for extensive sample clean-up or lengthy separations prior to MS detection.
Figure 2 shows four ESI mass spectra of polyethylene glycol (PEG) samples with increasing average molecular weight.
Both dimethyldichlorosilane and trifluoroacetic anhydride gave distinctive mass spectra with both molecular and fragment ions that were suitable for selected ion monitoring of 9-hydroxyphenanthrene at trace levels.
This gives good mass spectra with the advantage that the spectrum is the same at all points on the target, that is, "sweet spots" (defined as regions giving especially strong analyte signal) are eliminated.