Interpretation Of Mass Spectra
University Science Books, 22 lug 1993 - 371 pagine
Interpretation of Mass Spectra, say the authors, "aims at correlating ion dissociation mechanisms on a much broader scale, with emphasis on basic attributes such as ionization energies, proton affinities, and bond dissociation energies". They stress that the most important part of learning how to interpret unknown mass spectra is to practise doing it.
"Prof. McLafferty's text has become a classic for classroom or self study concerned with interpreting mass spectra in order to discern molecular structures or identities of compounds." International Journal of Mass Spectrometry
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3 The Molecular Ion
Basic Mechanisms of lon Fragmentation
Postulation of Molecular Structures
Theory of Unimolecular lon Decompositions
a-cleavage abundance acids activated additional alkyl amines appear arise aromatic assignment atoms base peak bond carbon atoms characteristic charge Chem cleavage cleaved common competitive complex compounds contain corresponding decompositions discussed dissociation effect electron elemental composition elimination energy Equation esters et al ether example favored Figure formation formed formula fragment functional further give higher hydrogen important increase indicates initial internal interpretation involve ion series ionization isomerization isotopic larger largest less loss lower m/z Int Mass Spectrometry mass spectrum McLafferty methyl migration molecular ion molecule neutral nitrogen Note occur OE+ ions oxygen peak position possible predicted presence probability product ion proton provides radical reactions rearrangement reference Relative intensity represent requires respectively resulting ring rule sample separated shown similar specific spectra stability structure substitution Table tion transfer types Unknown unsaturated usually values weight yield