Nag Amit, Goswami Debabrata
Department of Chemistry, Indian Institute of Technology, Sl-216, Kanpur 208016, Uttar Pradesh, India.
J Photochem Photobiol A Chem. 2009 Aug 15;206(2-3):188-197. doi: 10.1016/j.jphotochem.2009.06.007.
For a series of rhodamine dyes, two-photon absorption (TPA) and two-photon fluorescence (TPF) have been performed in different solvents. Solvent-dependent TPA spectra of these dyes were measured with open aperture z-scan method and compared to their respective single-photon spectra at equivalent energies. In the TPA spectra, relative peak intensities and positions are highly solvent dependent, which could be a result of vibronic couplings that depend on solvent environment. Measured TPA cross-sections of rhodamine dyes are consistently higher in nonpolar solvents. Certain complementary and similarity between TPA and TPF are also elucidated. Finally, a two-photon figure-of-merit is presented for these dyes in different solvents as a function of wavelength.
对于一系列罗丹明染料，已在不同溶剂中进行了双光子吸收（TPA）和双光子荧光（TPF）实验。使用开孔Z扫描法测量了这些染料的溶剂依赖型TPA光谱，并将其与相同能量下各自的单光子光谱进行了比较。在TPA光谱中，相对峰强度和位置高度依赖于溶剂，这可能是由于依赖于溶剂环境的振动耦合所致。罗丹明染料的测量TPA截面在非极性溶剂中始终较高。还阐明了TPA和TPF之间的某些互补性和相似性。最后，给出了这些染料在不同溶剂中作为波长函数的双光子品质因数。
