Mass spectra and reconstructed chromatograms (total ion current [TIC]) were obtained by automatic scanning in the mass range m/z 35 750 u. Uncertainties up to 0.1 pH units have been attributed to impurities in these reagents [ 2. Some Common Fragments at m/z include: 14 CH2 15 CH3 16 O 17 OH 18 H2O, NH4 . Korean Society for Mass Spectrometry, Mass Spectrometry Letters VF-NPL QExactive. It is found that the nitro substituent of some aromatic bifunctional compounds shows unusual reactivity towards protonation. Common Adduct and Fragment Ions in Mass Spectrometry Cross-platform mass spectrometry annotation in breathomics of ... PDF In CDCl3 CHEM 344/345 Spectroscopy and - Department of Chemistry Chemical ionization mass spectrometry of some nitro-containing ... The quadrupole temperature was 150 °C. + peak of a straight-chain hydrocarbon is always visible, but decreases in intensity as the molecule gets larger. Abstract. Volatile FiehnLib. At the moment I am looking at a mass spectrum for paracetemol (4-Hydroxy- (N-ethanoyl-aminobenzene)) which has four main m/z peaks at around 43, 80, 110 and 151. The ESI multi-stage mass spectra (MS n) of four oligostilbenes were studied for the first time by LCMS-IT-TOF, by which their fragmentation pathways were deduced. Following are examples of compounds listed by functional group, which demonstrate patterns which can be seen in mass spectra of compounds ionized by electron impact ionization. in Figure 2c. Under the appropriate expansion and desorption conditions parent masses of van der Waals dimers of these polymers were also observed. The computed results seem to be in acceptable agreement with experimental data, but often definite conclusions are difficult to obtain, e.g.