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(a) Schematic illustration of valence-differential spectroscopy. (b) Relative change in the averaged valence against the number of the electric pulses, 0.25 V in height and 1 s in duration, in film.
Valence-differential absorption spectra against relative change in the averaged valence in film at 300 K. Solid (broken) curves were measured in the -increasing (-decreasing) run. Inset shows relative change in absorption coefficient at 2.4 eV against . Open (closed) circles were obtained in the -increasing (-decreasing) run. Straight line is a result of least-square fitting.
(a) Absorption spectrum and valence-differential absorption spectrum of film at 300 K around the CN stretching mode. The absorption band indicated by is due to the CN stretching mode within . (b) and spectra of film at 300 K around the CN stretching mode. (c) and spectra of film at 300 K. (d) and spectra of film at 300 K. Solid curves in the lower panel of (c) and (d) represent decomposition of the spectrum with four Gaussian functions.
Transition energy , width , and oscillator strength of film and film.
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