1. |
- Ma, Y, et al.
(författare)
-
Core excitons and vibronic coupling in diamond and graphite
- 1993
-
Ingår i: Physical Review Letters. - 0031-9007. ; 71:22, s. 3725-3728
-
Tidskriftsartikel (refereegranskat)abstract
- The C 1s exciton in diamond is studied by soft x-ray emission excited with high resolution monochromatic photons. A strong phonon sideband of 5 eV wide is observed in the exciton recombination spectrum. With the phonon contribution, the exciton binding energy is estimated to be 1.5 eV. The excited atom is suggested to undergo Jahn-Teller relaxation similar to that of the nitrogen impurities in diamond. A similar exciton is observed at the sigma*-band threshold in graphite. These results provide new insights to the understanding of the core exciton and the donor problem in diamond and other systems.
|
|