Charge transfer mass spectra of i-butane have been obtained with slow positive ions. The spectra have been used to construct the breakdown curve, that is the mass spectrum as a function of the energy transferred to the molecule in the ionization. This is compared with the curve for n-butane...
If z = 1, then ratio m/e is the relative atomic or molecular mass of the given ion. In contrast to spectroscopic methods, mass spectrometry does not utilize any clearly defined property of the molecule. Consequently, complete reproducibility of the mass spectrum of a pure substance cannot be...
formation of surface carbon species under a reducing atmosphere strongly shifts the product spectrum to the C3-alkene at the expense of hydrogenolysis ... B Frank,TP Cotter,ME Schuster,... - 《Chemistry》 被引量: 7发表: 2013年 Studies on the catalytic hydrogenation of Baylis Hillman derivatives...
Example: In the EI mass spectrum of water (shown above) a large peak is seen at m/z value 18. Water has a weight of 18 atomic mass units, or Daltons, so the peak at m/z 18 represents the molecular ion. The smaller peak at m/z 17 represents a water molecule in which a hydrogen...
What fragments might you expect in the mass spectra of the compound shown below? What is spectroscopy? what would distinguish the mass spectrum of 2,2-dimethylpropane from those of pentane amd 2-methylbutane Explain how spectroscopy (to determine the concentration of an unknown) works in terms ...
The ideal size of butane flame (height about 1 cm) is controlled by pressure controlling valve and exactly adjusted by flow micro-adjusting valve. technologies, there is still a great necessity to engage in developing a more convenient and simpler ion- ization method to make whenever and ...
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 ...
The compounds are colorless and volatile, with melting points of −20° to −25°, 23–24°, and 55–56°C, respectively. The mass spectra show the molecular ion of each compound. The rearrangement ion [F3C C C C C CF2]+] gives the strongest peak in each spectrum....
48% yield. Its mass spectrum' revealed a molec- Interestingly, only a single isomer of the truxin- ular ion peak at tnle 277. Other features of the imide-truxillimide series was ~roduced. Its mass spectra of this product are discussed in formation is consistent with a photochemically...
Only cations can enter the ion optical system of the mass analyzer and are guided to the micro channel plate (MCP) detector system33. For every laser pulse a full ToF spectrum is recorded, which is converted to a mass spectrum (see Sect. 4.1 for a full description of the system). The...