Merschjann C, Schoke B, Conradi D, Imlau M, Corradi G, Polgár K
Universität Osnabrück, Fachbereich Physik, D-49069 Osnabrück, Germany.
J Phys Condens Matter. 2009 Jan 7;21(1):015906. doi: 10.1088/0953-8984/21/1/015906. Epub 2008 Dec 8.
The number densities and absorption cross sections of both optically generated and reduction-induced small electron and hole polarons in LiNbO(3) are determined by means of time-resolved pump-multiprobe spectroscopy. The data are obtained for free (Nb(Nb)(4+)) and bound (Nb(Li)(4+)) electron polarons, bound Nb(Li)(4+):Nb(Nb)(4+) electron bipolarons, and bound O(-) hole polarons. The peak absorption cross sections are in the range of σ(pol)≈(4-14) × 10(-22) m(2), comparable to that for Fe(2+). In all cases the ratio of occupied to unoccupied polaronic sites is less than 10(-2).
通过时间分辨泵浦多探针光谱法测定了LiNbO₃中光生和还原诱导的小电子和空穴极化子的数密度及吸收截面。获得了自由（Nb(Nb)⁴⁺）和束缚（Nb(Li)⁴⁺）电子极化子、束缚Nb(Li)⁴⁺:Nb(Nb)⁴⁺电子双极化子以及束缚O⁻空穴极化子的数据。峰值吸收截面在σ(pol)≈(4 - 14)×10⁻²² m²范围内，与Fe²⁺的相当。在所有情况下，占据的极化子位点与未占据的极化子位点之比小于10⁻²。
