| Автор | W J P van Enckevort |
| Автор | E H Versteegen |
| Дата выпуска | 1992-03-02 |
| dc.description | In contrast to virtually all natural diamonds, synthetic diamonds show a considerable, reversible, change in colour upon heating. This colour change from yellow to reddish brown in the type Ib diamonds is especially noticeable above 500 K and is attributed to the interaction of optical transitions at the substitutional nitrogen impurity centres with lattice vibrations. Optical absorption spectra of homogeneous regions in several crystals were measured as a function of temperature (77-773 K) in the wavelength interval 200-700 nm. The spectra are interpreted in terms of an analytical model for electronic transitions from a deep donor level to a continuous range of levels in the conduction band, where strong electron-phonon coupling is taken into account. Numerical evaluation based on this model yielded a Huang-Rhys factor, S=16+or-1, a phonon energy, h(cross) omega =0.15+or-0.02 eV and the temperature dependence of the nitrogen donor ionization energy. Upon a temperature rise to 750 K the latter showed a decrease of about 0.08 eV. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Temperature dependence of optical absorption by the single-substitutional nitrogen donor in diamond |
| Тип | paper |
| DOI | 10.1088/0953-8984/4/9/028 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 4 |
| Первая страница | 2361 |
| Последняя страница | 2373 |
| Аффилиация | W J P van Enckevort; Drukker Int. BV, Cuijk, Netherlands |
| Аффилиация | E H Versteegen; Drukker Int. BV, Cuijk, Netherlands |
| Выпуск | 9 |
