Abstract
Angle resolved near-edge absorption fine structure measurements of the C 1s edge of a film of the star-shaped molecule 4(HPBT) show a high degree of order, with the molecules maintaining a largely planar geometry in an upright configuration. X-ray excited optical luminescence measurements showed a dependence of the luminescence spectrum on the excitation energy, with (0-0), (0-1), and (0-2) vibrational modes being clearly visible when exciting off-resonance; the appearance of these features under off-resonance is attributed to a scattering process that is quenched when the excitation approaches a core absorption resonance. The HOMO-LUMO gap is estimated from the luminescence measurements (2.28 eV), and this value is confirmed by the comparison of the C 1s absorption and C Kα emission spectra.
Original language | English |
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Pages (from-to) | 355-359 |
Number of pages | 5 |
Journal | Journal of Electron Spectroscopy and Related Phenomena |
Volume | 184 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2011 Jul |
Keywords
- NEXAFS
- Soft X-ray emission spectroscopy
- XEOL
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Radiation
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Spectroscopy
- Physical and Theoretical Chemistry