‣ The Most Abundant Peak in the Mass Spectrum is called the BASE PEAK. Thursday, February 7, 13 ©2013 Gregory R. Cook, NDSU 13 The Mass Spectrum ‣ MS of propane ‣ note isotopes and fragments ‣ base peak at m/z 29 CH 3 CH 2 CH 3 Thursday, February 7, 13 ©2013 ...
The Leu spectrum shows major loss of propane, while that of the Ile derivative shows elimination of both methane and ethane. This method may be used routinely with 10 g quantities of peptide material.doi:10.1002/rcm.1290091305Steven L. Ramsay...
1. A liquid compound gave a mass spectrum showing a strong molecular ion at m/z = 156. The only fragment ions are seen at m/z = 127 and 29. Suggest a structure of this compound. 2. A liquid compound gave a mass spectrum in which the molecular ion appears as a pair of equal inte...
recorded, which is converted to a mass spectrum (see Sect. 4.1 for a full description of the system). The sample, i.e., organic films of amino acids, are prepared in polished cavities (Ø 3 mm) by dropcasting 1 µL amino acid solution with concentrations ranging from 100–1...
is often the molecular ion. If the ion source produces extensive fragmentation it is referred to as hard ionization, and the base peak in the resulting spectra may be one of the fragment ions. By convention, the base peak in a mass spectrum is assigned a relative abundance value of 100%....
MassSpectrometryIntroduction：质谱法介绍
The negative three-pion mass spectrum between 1.0 and 1.4 BeV has been examined in the reactions ${$pi${}}^{-}p$rightarrow${}p({$pi${}}^{-}{$pi${}}^{-}{$pi${}}^{+})$, ${$pi${}}^{-}p$rightarrow${}p{$pi${}}^{0}({$pi${}}^{-}{$pi${}}^{-}{$pi${}}...
For the series of bis-tricarbonylchromium complexes, an MH + ion is prominent only in the chemical ionization spectrum of the diphenylpropane complex. The electron impact induced spectra of the bis-tricarbonylchromium complexes are similar to those of the mono-complexes in that loss of CO is a...
质谱（mass spectrum）Mass spectrometry (MS), 2010-05-22, 22:597.4.1 principle Mass spectrometry is one of the important methods to determine the structure of organic compounds developed in the 40s of this century. The mass spectrometer mainly consists of four parts Ionization variable arc ...
Not less important is the fact that, whatever the peptide, knowledge of its amino acid composition greatly facilitates reading of its mass spectrum, thus making for an unequivocal interpretation of the spectral pattern. A second requisite for success is the existence of a micromethod for trans-...