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(Color) (a) DMAA molecule and directions of the molecular axes. (b) Absorption spectrum of DMAA in solution at room temperature. Inset: energy, oscillator strength, and direction cosines of the lowest calculated electronic transitions of the isolated DMAA molecule. (c) Room-temperature absorption spectra collected at normal incidence on the face of a DMAA single crystal with the electric field along either the or the principal axis and collected at 30° and 60° angles of incidence on the face, with as plane of incidence and polarized light. Inset: sketch of the packing of the molecules in the crystal as viewed from the face, and of the orientation of the and principal axes lying in the plane.
Absorbance spectra of a DMAA crystal at room temperature and at with polarized light at normal incidence, together with the results of the linear fit which allows us to deduce the corresponding parameters , and in turn by Eq. (1).
PL spectra of a DMAA crystal as taken at different temperatures. Inset: PL spectra on an enlarged scale and scheme of the potential energy curve in configurational coordinates for self-trapped (ST) and free excitons.
Width at the DMAA emission band vs temperature. Inset: corresponding DMAA PL spectra.
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