No abstract

Benzene, toluene, phenol, diphenyl ether and the three isomeric dihydroxy-benzenes have been examined using an MS-9 mass spectrometer under conditions that allowed only ions having twice the normal amount of kinetic energy to be detected. These ions are, in fact, singly charged ions arising from charge exchange reactions of doubly charged ions of the same mass, occurring in the first field free region of the spectrometer. It is argued that the spectra obtained yield essentially the distribution of doubly charged ions in the source region. These 'doubly charged ion' mass spectra are compared with the normal singly charged ion spectra of the compounds and the implications of the significant differences that are found, are discussed.

No abstract

Anglia, Norwich N R 4 7TJ 13C N.m.r. spectra of trans-azobenzene and a series of its substituted derivatives have been obtained in the solid phase. Additional effects are observed, not present in the solution spectra of the species, and these are shown to be due to the locking of the molecules into particular conformations in the solid. The first 13C n.m.r. spectrum of a reasonably complex solid dyestuff is shown and an assignment of this has been attempted, based upon the effects observed in the solid reference compounds.METHODS for obtaining high-resolution n.m.r. spectra of materials in solution have been developed for many years. However, application of these conventional methods to solid materials is generally uninformative since in solids non-averaged nuclear dipole-dipole interactions cause excessive broadening, which usually results

the range being from about m/e 206 to about rnle 520. The parent peak with the highest intensity occurred a t rnle 274,