Subpicosecond vibrational relaxation of the S1 states of azulene and guaiazulene in solution

1995 ◽  
Vol 73 (2) ◽  
pp. 303-306 ◽  
Author(s):  
Dietrich Tittelbach-Helmrich ◽  
Brian D. Wagner ◽  
Ronald P. Steer
Keyword(s):  
Vibrational Relaxation ◽  
Internal Conversion ◽  
Vibrational Energy ◽  
Energy Content ◽  
Pump Probe ◽  
Decay Times ◽  
Probe Experiment ◽  
Pump Probe Experiment ◽  
Probe Spectroscopy ◽  
Electronic Ground

The S1 population decay times of azulene and 1,4-dimethyl-7-isopropylazulene (guaiazulene) in solution have been determined as a function of their initial vibrational energy content, [Formula: see text] using a pump–probe experiment with subpicosecond time resolution. The S1 lifetime of azulene does not depend on [Formula: see text] for energies up to 1760 cm−1, whereas the lifetime of the shorter-lived S1 state of guaiazulene is independent of [Formula: see text] only for energies up to ~1000 cm−1. At higher energies, the lifetime decreases with increasing [Formula: see text] and exhibits the same behavior in two structurally different solvents. It is suggested that internal conversion to the electronic ground state from a vibrationally unrelaxed S1 state is responsible for the effects observed in guaiazulene, and that intramolecular vibrational redistribution occurs with a time constant of several hundred femtoseconds. Keywords: pump–probe spectroscopy, azulene, femtosecond processes.

Collinear pump probe experiment, novel approach to ultrafast spectroscopy

1999 ◽  
Vol 68 (4) ◽  
pp. 689-692 ◽  
Author(s):  
B. Bousquet ◽  
L. Canioni ◽  
J. Plantard ◽  
L. Sarger
Keyword(s):  
Ultrafast Spectroscopy ◽  
Pump Probe ◽  
Novel Approach ◽  
Probe Experiment ◽  
Pump Probe Experiment

scholarly journals Excited-state dynamics of overlapped optically-allowed 1B(u)+ and optically-forbidden 1B(u)- or 3A(g)- vibronic levels of carotenoids: possible roles in the light-harvesting function.

2012 ◽  
Vol 59 (1) ◽  
Author(s):  
Yasushi Koyama ◽  
Yoshinori Kakitani ◽  
Hiroyoshi Nagae
Keyword(s):  
Internal Conversion ◽  
Selection Rule ◽  
Polar Solvent ◽  
Selective Excitation ◽  
Stimulated Emission ◽  
Quantum Beat ◽  
Pump Probe ◽  
Cross Term ◽  
Hand Pump ◽  
Probe Spectroscopy

Pump-probe spectroscopy after selective excitation of all-trans Cars (n = 9-13) in nonpolar solvent identified a symmetry selection rule of diabatic electronic mixing and diabatic internal conversion, i.e., '1B(u)(+)-to-1B(u)(-) is allowed but 1B(u)(+)-to-3A(g)(-) is forbidden'. Kerr-gate fluorescence spectroscopy showed that this selection rule breaks down, due to the symmetry degradation when the Car molecules are being excited, and, as a result, the 1B(u)(+)-to-3A(g)(-) diabatic electronic mixing and internal conversion become allowed. On the other hand, pump-probe spectroscopy after coherent excitation of the same set of Cars in polar solvent identified three stimulated-emission components (generated by the quantum-beat mechanism), consisting of the long-lived coherent cross term from the 1B(u)(+) + 1B(u)(-) or 1B(u)(+) + 3A(g)(-) diabatic pair and incoherent short-lived 1B(u)(+) and 1B(u)(-) or 3A(g)(-) split incoherent terms. The same type of stimulated-emission components were identified in Cars bound to LH2 complexes, their lifetimes being substantially shortened by the Car-to-BChl singlet-energy transfer. Each diabatic pair and its split components appeared with high intensities in the first component. The low-energy shifts of the 1B(u)(+)(0), 1B(u)(-)(0) and 3A(g)(-)(0) levels and efficient triplet generation were also found.

scholarly journals Probing calculatedO2+potential-energy curves with an XUV-IR pump-probe experiment

2015 ◽  
Vol 91 (4) ◽  
Author(s):  
Philipp Cörlin ◽  
Andreas Fischer ◽  
Michael Schönwald ◽  
Alexander Sperl ◽  
Tomoya Mizuno ◽  
...  
Keyword(s):  
Potential Energy ◽  
Potential Energy Curves ◽  
Pump Probe ◽  
Probe Experiment ◽  
Pump Probe Experiment

scholarly journals VUV-induced dynamics of the electronically excited C2D4 molecule in a single-color pump-probe experiment

2019 ◽  
Vol 3 ◽  
pp. 100024 ◽  
Author(s):  
Oliver Schepp ◽  
Arne Baumann ◽  
Marek Wieland ◽  
Armin Azima ◽  
Markus Drescher
Keyword(s):  
Pump Probe ◽  
Probe Experiment ◽  
Electronically Excited ◽  
Pump Probe Experiment

Effects of a modulation of the pump-polarization in a degenerate pump/probe experiment

1999 ◽  
Vol 5 (3) ◽  
pp. 447-452 ◽  
Author(s):  
H. Mesnil ◽  
M.C. Schanne-Klein ◽  
F. Hache
Keyword(s):  
Pump Probe ◽  
Probe Experiment ◽  
Pump Probe Experiment
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