Synthesis and characterization of the multi-photon absorption and excited-state properties of a neat liquid 4-propyl 4′-butyl diphenyl acetylene
作者:Iam Choon Khoo、Scott Webster、Shoichi Kubo、W. Justin Youngblood、Justin D. Liou、Thomas E. Mallouk、Ping Lin、David J. Hagan、Eric W. Van Stryland
DOI:10.1039/b905716a
日期:——
The synthesis, characterization, and quantitative electronic structure modeling of multi-photon absorption properties of a neat liquid L34 (4-propyl 4â²-butyl diphenyl acetylene) are reported. The liquid is (linearly) transparent in the visible spectrum, but possesses large two-photon absorption (2PA) and 2PA-induced singlet and triplet excited-state absorption as measured by the Z-scan technique and non-linear transmission measurements using both picosecond and nanosecond pulses. The most dominant contributions to the intensity-dependent non-linear absorption come from the 2PA-induced triplet excited states in the nanosecond time regime. We also present transient absorption spectra of the liquid obtained by nanosecond laser-flash photolysis and compare these results with electronic structure calculations. The energy of the absorption bands, both singlet and triplet are in reasonable agreement with calculations performed with Gaussian 03. The experimentally measured spectra and theoretical electronic structure modeling provide information about the energy levels of the excited states of this liquid, including 2PA and 2PA-induced process that is responsible for its non-linear optical properties.
报道了纯液体L34(4-丙基4'-丁基二苯乙炔)的多光子吸收性质的合成、表征和定量电子结构建模。该液体在线性透明可见光谱范围内,但通过Z扫技术和使用皮秒和纳秒脉冲的非线性传输测量,显示出大的双光子吸收(2PA)和2PA诱导的单线态和三线态激发态吸收。对强度相关的非线性吸收的最主要贡献源于纳秒时间尺度下由2PA诱导的三线态激发态。我们还展示了通过纳秒激光闪光光解法获得的液体瞬态吸收光谱,并将这些结果与电子结构计算进行比较。无论是单线态还是三线态的吸收带能量,都与使用Gaussian 03进行的计算合理一致。实验测量的光谱和理论电子结构建模提供了有关该液体激发态能级的信息,包括负责其非线性光学特性的2PA和2PA诱导过程。