Dissociative ionization of 1,4-bis(2,5-phenyloxazolyl)benzene

Electron-Impact Mass Spectrometry of PTCDA Molecules in the Gas Phase

“…As was emphasized above, in works [9,10], the energies, at which the fragment ions appear, and the ionization energy of a PTCDA molecule were determined, by using the least-squares method on the basis of experimental data for the threshold sections in the energy dependences of the fragment ion formation and the total relative ionization cross-section of a PTCDA molecule. The results obtained for some intense fragment ions ( Fig.…”

“…In our previous works [9,10], we reported the results of our researches concerning the electron-impact ionization, both single and dissociative, of 1,4-bis(2,5phenyloxazolyl)benzene (POPOP) and 9,10-bis(phenylethynyl)anthracene (BPEA) molecules in the gas phase. In this paper, for the first time, the results of mass spectrometric studies of the PTCDA molecule in an interval of 0-400 Da are presented together with the experimental energy dependences of the effective cross-section of the single ionization of this molecule in a wide range of bombarding electron energies and molecular evaporation temperatures.…”

Ionization of 4,4′-Bis(Phenylethynyl)-Anthracene by Electron Impact

“…It should be noted that mass spectroscopy is the most direct tool for studying the formation of primary and secondary ions. In spite of some problems in mass spectroscopic experiments with such molecules, 4,5 there is considerable interest from developers of molecular electronics devices 6,7 in such studies. Note that one of the main distinctions of organic materials from inorganic is a conservation of basic optical and electrophysical properties under conversion of free molecules into the solid state 2,3,8 owing to weak intermolecular interactions.…”