8th International Topical Meeting on Photoacoustic and Photothermal Phenomena
8 ITMP³ / 8éme conférence internationale de photoacoustique et photothermique

J. Phys. IV France 04 (1994) C7-421-C7-424
DOI: 10.1051/jp4:1994799

Anomalous photoacoustic effect from pulsed excitation of Eu ³⁺ ions

S.M. Park¹, P.J. Chong², T.H. Yoon³, H. Moon³ and J.G. Choi<sup>4

1</sup>  Department of Chemistry, Kyung Hee University, Seoul 130-701, Korea
²  Korea Research Institute of Chemical Technology, Daeduck Science Town, Taejon 305-606, Korea
³  Department of Chemistry, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea
⁴  Department of Chemistry, Yonsei University, Seoul 120-749, Korea

Abstract
When Eu³⁺ ions in aqueous solution are excited from ⁷F₁ state to ⁵D₀ state with a pulsed dye laser, the population of Eu³⁺ ions in the ⁷F₁ state decreases temporarily due to the slow decay of the ⁵D₀ state. The magnitude of transient photoacoustic signal from absorption of light by water and Eu³⁺ ions was found to decrease when the dye laser wavelength was tuned to the transition. This anomalous photoacoustic effect is attributed to the fast thermal equilibrium between "cold" Eu³⁺ ions and ambient water molecules.

© EDP Sciences 1994