| Popis: |
In addition to the narrow zero-phonon line at the photoionisation band edge at 2.4377 eV reported in absorption measurements of Ni-doped ZnS, another two sharp lines at 2.4268 and 2.4325 eV in the electroabsorption spectrum have been detected for the first time. At the bottom of the photoinization band a new structure has also been observed, which consists of a zero-phonon line at 3.3897 eV and its LO-phonon sidebands. The zero-phonon lines in the photoionization band are attributed to transitions into hydrogen-like states of a hole, loosely bound to a Ni1+ ion which is either in the ground 2 T 2 or high-lying excited 2 E states. |
