Mass spectral cracking patterns

As pointed out by Ettinger et al. (4), the trans N F is the less active isomer which is different from the active isomer by Its (1) vapor pressure (2) boiling point (3) heat of vaporization (4) critical temperature (5) melting point (6) mass spectral cracking pattern (7) NMR spectrum (8) infrared spectrum (9) heat of isomerization (10) reactivity with mercury and glass. 

Fig. 5.11 Mass spectral cracking patterns of nickel tetracarbonyl and iron pentacarbonyl.

The application of mass spectroscopy for the characterization of metal 7r-complexes is becoming increasingly popular. This section deals with the mass spectral data of several 7i-cyclopentadienyl, 7r-arene, and olefin metal 7r-complexes. Extensive studies have been made on Tu-cyclopentadienyl complexes, but little work has been done on the correlation of the mass spectral cracking patterns and energies of 7r-arene and 7r-allyl metal complexes. 

Mass Spectra. Whereas In the depth profiling mode the mass spectrometer Is used as a filter to obtain only one or a few masses for detection In the mass spectral mode the mass spectrometer Is used for the Identification and comparison of a wide range of masses. A survey mass spectrum Is often performed as the first step In any SIMS analysis and determines the presence of various elements and species on or near the surface and the relative Intensity of their respective signals. Further work would be required to relate signal Intensities to absolute or even relative concentrations. However the relative Intensities observed In Isotopic distributions for elements or In cracking patterns for molecules are useful In species Identification. 

---