Formation of electronically excited states in ultrathin Alq3 films during electron bombardment |
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Authors: | A V Kukhta |
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Institution: | (1) Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 prosp. Nezavisimosti, Minsk, 220072 |
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Abstract: | Electronic and vibrational electron energy loss spectra are studied on ultrathin Alq3 films for different electron energies, thicknesses, and temperatures of the film. The shape of the spectrum and the position
of the lines are very weakly dependent on the film thickness, indicating weak interaction between the adsorbed molecules and
the platinum substrate. The temperature dependence of the vibrational bands is weak. The positions of the triplet and singlet
maxima are close to gas-phase and thin-film data obtained for high electron energy. Interference of electrons is observed
in measuring the energy loss spectra. The effect of dipole and collisional excitation mechanisms is shown. From the similarity
between the energy loss spectra it follows that the nature of the interaction between low-energy electrons and organic materials
is the same in gas and thin-film phases, and likewise for the characteristics of the motion of the electrons.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 6, pp. 786–791, November–December, 2006. |
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Keywords: | electron thin film Alq3 energy loss spectrum |
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