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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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Femtosecond pump-probe measurements of non-radiative relaxation in LiAlO2:V3+

Wells, Jon-Paul R and Grinberg, Marek and Wynne, Klaas and Han, T P J (2006) Femtosecond pump-probe measurements of non-radiative relaxation in LiAlO2:V3+. Journal of Physics: Condensed Matter, 18 (16). pp. 3967-3974. ISSN 0953-8984

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Abstract

We report on time-resolved studies of non-radiative relaxation of V3+ ions in LiAlO2 by means of a two-beam, pump-probe saturation experiment performed with the 150 fs pulsed output of a Ti-sapphire laser. Exciting into the vibronically broadened 3A2 → 3T1 transition at 800 nm, a 3T1 relaxation time of 199 ps has been measured at 4 K. This value decreases to 82 ps at room temperature, representing a reduction in the lifetime of a factor of 2.5 due to internal-conversion processes. The relative probabilities for non-radiative, phonon-assisted barrier hopping and quantum mechanical tunnelling through the potential barrier to the 3A2 ground state have been obtained using Mott's expression, yielding best-fit parameters of W0 = (5.2 ± 1) x 109 Hz and W1 = (7.5 ± 1) x 1010 Hz for a potential barrier of Enr = 530 ± 50 cm-1.