Ion Fast Atom Bombardment Mass Research Articles

The fast atom bombardment mass spectra of cationic Technetium(III) complex salts

The positive ion fast atom bombardment mass spectra of a series of monovalent Technetium(III) cation complexes yield intense [C]+ ions and distinctive fragmentation information.

Fast Atom Bombardment mass spectra of involatile sulphonated and phosphonated azo dyestuffs

Positive and negative ion Fast Atom Bombardment mass spectra have been obtained for involatile mono- and disazo dyestuffs, containing up to five sulphonate and phosphonate groups. The spectra are discussed with special reference to the ions formed by cleavage of the azo linkages in both the mono- and disazo compounds. Characteristic fragment ions are also found for a compound containing a pyrazolone ring.

Positive and negative ion fast atom bombardment mass spectrometric studies on chlorophylls : Structure of 4-vinyl-4-desethyl chlorophyll B

Positive and negative ion Fast Atom Bombardment mass spectra have been used to study chlorophylls at pmol levels in a matrix of thiodiglycol, and the molecular ion is used to distinguish reliably the 2 mass unit shift between chlorophyll b and 4-vinyl-4-desethyl chlorophyll b.

Fast atom bombardment of molecules in the gaseous state

Involatile molecules usually exhibit a protonated molecular ion MH + in positive and an (M- H) − species in negative ion fast atom bombardment mass spectra. If a compound evaporates it may be ionized by fast atom impact in the gaseous state. Fast atom bombardment mass spectra of some volatile compounds are compared to those obtained by electron impact ionization.

The fast atom bombardment mass spectra of glucosinolates and glucosinolate mixtures

AbstractThe behaviour of glucosinolates and desulphoglucosinolates under fast atom bombardment conditions has been investigated. Relatively little fragmentation was noted in the mass spectra of these compounds. The positive ion fast atom bombardment mass spectra of glucosinolates exhibited abundant cationized and protonated molecula ions, thus complementing the previously reported electron impact and chemical ionization mass spectra of these compounds. Desulphoglucosinolates yield only the protonated molecular ion. Under negative ion conditions the spectra of glucosinolates were dominated by the molecular anion and this has been used as a means of analysing a crude plant extract containing a complex mixture of glucosinolates.