An Introduction to Time-Resolved Pump/Probe Spectroscopy

1985 ◽  
Vol 39 (3) ◽  
pp. 444-451 ◽  
Author(s):  
F. E. Lytle ◽  
R. M. Parrish ◽  
W. T. Barnes
Keyword(s):  
Absorption Spectra ◽  
Ground State ◽  
Fluorescence Spectra ◽  
Excited State Absorption ◽  
Time Dependent ◽  
Triplet Excited State ◽  
Ground State Absorption ◽  
Time Resolved ◽  
Pump Probe ◽  
Probe Spectroscopy

The construction and operating principles of a two-color pump/probe spectrometer are described. This instrument is capable of obtaining ground-state absorption spectra, both singlet-singlet and triplet-triplet excited-state absorption spectra, photoproduct spectra, and stimulated fluorescence spectra. In addition, time-dependent measurements can be made with an impulse response of 250 ps and a free temporal range of 13 ns.

scholarly journals Ultrafast Electron/Energy Transfer and Intersystem Crossing Mechanisms in BODIPY-Porphyrin Compounds

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 312
Author(s):  
Yusuf Tutel ◽  
Gökhan Sevinç ◽  
Betül Küçüköz ◽  
Elif Akhuseyin Yildiz ◽  
Ahmet Karatay ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Spectra ◽  
Visible Region ◽  
Energy Transfer Mechanism ◽  
Free Base ◽  
Pump Probe ◽  
Harvesting Efficiency ◽  
Probe Spectroscopy ◽  
Absorption Features ◽  
Transfer Mechanisms

Meso-substituted borondipyrromethene (BODIPY)-porphyrin compounds that include free base porphyrin with two different numbers of BODIPY groups (BDP-TTP and 3BDP-TTP) were designed and synthesized to analyze intramolecular energy transfer mechanisms of meso-substituted BODIPY-porphyrin dyads and the effect of the different numbers of BODIPY groups connected to free-base porphyrin on the energy transfer mechanism. Absorption spectra of BODIPY-porphyrin conjugates showed wide absorption features in the visible region, and that is highly valuable to increase light-harvesting efficiency. Fluorescence spectra of the studied compounds proved that BODIPY emission intensity decreased upon the photoexcitation of the BODIPY core, due to the energy transfer from BODIPY unit to porphyrin. In addition, ultrafast pump-probe spectroscopy measurements indicated that the energy transfer of the 3BDP-TTP compound (about 3 ps) is faster than the BDP-TTP compound (about 22 ps). Since the BODIPY core directly binds to the porphyrin unit, rapid energy transfer was seen for both compounds. Thus, the energy transfer rate increased with an increasing number of BODIPY moiety connected to free-base porphyrin.

scholarly journals Time-Resolved Pump-Probe Spectroscopy with Spectral Domain Ghost Imaging

2020 ◽  
Author(s):  
Siqi Li ◽  
Taran Driver ◽  
Oliver Alexander ◽  
Bridgette Cooper ◽  
Douglas Garratt ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Pump Pulse ◽  
Chemical Bonding ◽  
Atomic Level ◽  
Spectral Domain ◽  
Ghost Imaging ◽  
Time Resolved ◽  
Pump Probe ◽  
Probe Spectroscopy

An atomic-level picture of molecular and bulk processes, such as chemical bonding and charge transfer, necessitatesanunderstandingofthedynamicalevolutionofthesesystems. Ontheultrafasttimescalesassociatedwithnuclearandelectronicmotion,thetemporalbehaviourofasystem is often interrogated in a ‘pump-probe’ scheme. Here, an initial ‘pump’ pulse triggers...

Femtosecond Time-Resolved Pump−Probe Spectroscopy of NaI in Rare-Gas Environment†

1997 ◽  
Vol 101 (27) ◽  
pp. 4852-4859 ◽  
Author(s):  
G. Knopp ◽  
M. Schmitt ◽  
A. Materny ◽  
W. Kiefer
Keyword(s):  
Rare Gas ◽  
Time Resolved ◽  
Pump Probe ◽  
Gas Environment ◽  
Probe Spectroscopy

Synthesis and Characterization of Novel Platinum Acetylide Oligomers

2003 ◽  
Vol 771 ◽  
Author(s):  
Thomas M. Cooper ◽  
Benjamin C. Hall ◽  
Daniel G. McLean ◽  
Joy E. Rogers ◽  
Aaron R. Burke ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Ground State ◽  
Near Infrared ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Structure Property ◽  
Ground State Absorption ◽  
Excitation Spectra ◽  
C Nmr

AbstractAs part of an effort to develop a spectroscopic structure-property relationship in platinum acetylide oligomers, we have prepared a series of bidentate Pt(PBu3)2L2 compounds. The ligand was the series o-syd-C6H4-CΞC-(C6H4-CΞC)n-H, n = 0,1,2. The terminal oligomer unit consisted of a sydnone group ortho to the acetylene carbon. The compounds were characterized by various methods, including 13C-NMR, ground state absorption, fluorescence, phosphorescence and laser flash photolysis. The acetylenic 13C-NMR resonances showed sydnone influences that decreased with increasing number of monomer units. The ground state absorption spectra were slightly red shifted from those of the baseline oligomers not having a sydnone group. The low temperature emission and excitation spectra showed complex dependence on excitation and emission wavelengths, suggesting the chromphores resided in a distribution of solvent environments and conformations. Finally, broad triplet state absorption spectra were observed, with absorption throughout the visible and near infrared regions.

Erbium Doped Tellurite Glasses

1991 ◽  
Vol 244 ◽  
Author(s):  
Jau-Sheng Wang ◽  
Elias Snitzer ◽  
George H. Sigel
Keyword(s):  
Excited State ◽  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
Optical Transition ◽  
Emission Cross Section ◽  
Excited State Absorption ◽  
Tellurite Glasses ◽  
Ground State Absorption ◽  
Erbium Doped

ABSTRACTThe results to be presented focus on the optimization of tellurite glass compositions which are suitable both for doping with erbium oxide as well as subsequent for fiber drawing. The laser related properties, such as fluorescence spectrum, lifetime, and optical transition cross sections will be presented. Judd-Ofelt parameters for erbium in the glasses have been exploited to predict fluorescence lifetime, excited state absorption(ESA), ground state absorption(GSA) and ground state fluorescence(GSF). For comparison, the absorption cross section, emission cross section, excited state absorption(ESA)/ground state absorption(GSA)(0.8μm pumping) and fluorescence terminating in the ground state(GSF)/excited state absorption(ESA) ratios are calculated for both Al2O3-SiO2 and tellurite glasses.

scholarly journals A comparative study of the photochemistry of biphenyl adsorbed on cellulose and silicalite

2004 ◽  
Vol 6 (4) ◽  
pp. 193-198 ◽  
Author(s):  
J. P. Da Silva ◽  
L. F. Vieira Ferreira
Keyword(s):  
Ground State ◽  
Diffuse Reflectance ◽  
Solid Support ◽  
Ground State Absorption ◽  
Solid Supports ◽  
Time Resolved ◽  
Planar Configuration ◽  
Degradation Analysis ◽  
Photochemical Behaviour ◽  
Product Degradation

The photochemistry of biphenyl (BP) was studied on two model solid supports, silicalite and cellulose, using time resolved diffuse reflectance techniques and product degradation analysis. The results showed that the photochemical behaviour of BP depends on the solid support. Ground state absorption spectra indicated a near planar configuration in the ground state. BP triplet state was the only species detected on cellulose, while the radical cation(BP•+)was observed in silicalite. BP is relatively stable in both supports. Prolonged irradiations in cellulose lead to the formation of the three monohydroxybiphenyls, while in silicalite photooxidation products prevailed.

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