Mechanisms of ultrafast fluorescence depletion spectroscopy and applications to measure slovation dynamics of coummarin 153 in methanol

• Published in: Journal of luminescence Vol. 132; no. 9; pp. 2275 - 2280
• Main Authors: Yang, Songqiu, Liu, Jianyong, Zhou, Panwang, Chen, Junsheng, Han, Keli, He, Guozhong
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.09.2012; Elsevier
• Subjects: Atomic and molecular physics; Coumarin 153; Depletion; Dynamics; Exact sciences and technology; Fluorescence; Fluorescence and phosphorescence; radiationless transitions, quenching (intersystem crossing, internal conversion); Fluorescence depletion spectroscopy; Fluorescence up-conversion; Methyl alcohol; Molecular properties and interactions with photons; Perturbation methods; Physics; Solvation; Spectroscopy; Stimulated emission; Time-resolved solvation dynamics; Upconversion; Fluorescence up-conversion; Stimulated emission; Fluorescence depletion spectroscopy; Time-resolved solvation dynamics; Coumarin 153; Radiative transition; Chemical solution; Fluorescence; Frequency conversion; Experimental device; Excited states; Time resolved spectra; Solvation; Methanol; Ultrafast process
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2012.03.062

Subpicosecond fluorescence depletion spectroscopy (FDS) was used to measure the solvation dynamics of coumarin 153 (C153) in methanol. The FDS mechanisms were discussed. A quasi-continuous model was used to describe the solvational relaxation of excited states. The perturbations of the probe pulse on the excited sample system, including up-conversion and stimulated emission, were sufficiently discussed. For a probe molecule used in the FDS experiment, ensuring that the up-conversion perturbation can be negligible is important. FDS was found to be a good technique for measuring the solvation dynamics of C153 in methanol. ► Mechanisms of subpicosecond fluorescence depletion spectroscopy. ► Quasi-continuous model was used to describe the solvational relaxation. ► The solvation dynamics of coumarin 153 in methanol has been measured.