| Autor: |
Herren, Markus, Jacobsen, Stuart M., Güdel, Hans U., Briat, Bernard |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 1/15/1989, Vol. 90 Issue 2, p663, 9p |
| Abstrakt: |
Ti2+Mn2+ dimers and three types of Mn2+Ti2+Mn2+ trimers obtained by codoping MgCl2 with Ti2+ and Mn2+ were studied by site-selective dye-laser spectroscopy. Very high selectivity was achieved by using the 6A1g→4A1g,4Eg excitation on Mn2+, which does not coincide with any Ti2+ single-ion excitation. Sharp-line 1Eg(T2g)→3Ta1g luminescence from Ti2+ was observed in the near infrared (NIR). Electronic ground-state splittings resulting from Ti2+–Mn2+ exchange interactions were observed for the various spin clusters and, as a result, accurate exchange parameters could be obtained. The luminescence behavior of Ti2+Mn2+ pairs was investigated as a function of temperature and compared with the behavior of Ti2+ single ions in MgCl2. As in Ti2+:MgCl2 luminescence from Ti2+Mn2+ clusters was not only observed in the NIR but also in the visible, it corresponds to 3Tb1g→3Ta1g transitions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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