Electron impact ionization of tellurium in the gas phase
DOI:
https://doi.org/10.15407/dopovidi2018.05.044Keywords:
electron impact, energy of appearance, ionization, telluriumAbstract
The processes of ionization of tellurium in the gas phase by the electron impact have been studied by mass spectrometry, by using the technique of intersecting beams. The mass spectra of tellurium are studied in the range of mass numbers 50—350 Da at various energies of ionizing electrons from 6 to 70 eV and in the temperature range 400—600 K. The mass spectrum consists of three groups of peaks corresponding to atomic Te+, molecular Te2+, and doubly charged Te2+ ions. It is shown that the ratio of the intensity of isotope peaks to the main one is conserved for both atomic and molecular ions. It is found that diatomic tellurium molecules prevail in the gas phase at experimental temperatures. The ionization functions of Te+, Te2+, and Te2+ ions and the energies of appearance and ionization of molecular and atomic tellurium ions are determined by the method of least squares over the threshold sections of the curves. For the first time in the mass spectra of tellurium, a doubly charged Te2+ ion is found, for which the energy dependence of the ionization by the electron impact is obtained, and the ionization energy E = 20.6 ± 0.25 eV is determined.
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