Picture of two heads

Open Access research that challenges the mind...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

Discover more...

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

Wells, J P R and Grinberg, M and Wynne, K 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

Full text not available in this repository. (Request a copy from the Strathclyde author)

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 A pulsed output of a Ti-sapphire laser. Exciting into the vibronically broadened (3)A(2) -> T-3(1) transition at 800 nm, a T-3(1) 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 W-0 = (5.2 +/- 1) x 10(9) Hz and W-1 = (7.5 +/- 1) x 10(10) Hz for a potential barrier of Enr = 530 +/- 50 cm(-1).