IONIZATION AND DISSOCIATION OF MOLECULES OF N-OCTANE AND N-NONANE BY MONOENERGETIC ELECTRONS
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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A study was made of the processes of fragmention formation and of molecular-ion excitation on electron impact by the aid of monokinetic electrons. The ionization curves of fragment ions and molecular ions of octane, octane-2D sub 1 and nonane-5C-13 were investigated by means of a specially designed mass spectrometer. A secondary-electron multiplier was used to measure the small ionic currents of the order of 10 to the -17th power amp. The ionization potential of the molecular ion C8H18 was 10.3 ev in comparison with the calculated value of 10.26 ev. The ionization potential of C sub n H sub n1 ions corresponded to the formation of an ion and a radical. The potentials of the ion C3H7 from octane and of C3H6D from a labeled molecule of octane-2D sub 1 agreed. The first potentials of the C sub n H sub 2n1 ions corresponded to the process of rupture of a single C-C bond. The energy of rupture of this C-C bond of the octane molecular ion increased with the decreasing number of C atoms in the C sub n H sub 2n1 ion. Fragment ions of the type C sub n H sub 2n are created by the formation of an ion and 1 new molecule.