A reliable pump‐probe, broadband spectrometer for subpicosecond transient absorption

1991 ◽  
Vol 62 (3) ◽  
pp. 600-608 ◽  
Author(s):  
N. P. Ernsting ◽  
M. Kaschke
Keyword(s):  
Transient Absorption ◽  
Pump Probe

scholarly journals Transient Absorption Spectra of Vibrationally Excited Water Molecule on Zeolite Surface

1999 ◽  
Vol 19 (1-4) ◽  
pp. 317-320
Author(s):  
Tatsuya Fujino ◽  
Akihide Wada ◽  
Satoru S. Kano ◽  
Kazunari Domen ◽  
Chiaki Hirose
Keyword(s):  
Water Molecule ◽  
Transient Absorption ◽  
Excited Level ◽  
Rapid Decay ◽  
Vibrationally Excited ◽  
Pump Probe ◽  
Zeolite Surface ◽  
Transient Absorption Spectra ◽  
Spectroscopic Feature ◽  
Hot Band

By means of infrared pump-probe technique, spectroscopic feature of vibrationally excited water molecule (D2O) on mordenite zeolite (OD) has been investigated. Populational lifetime of the OD stretching band (ν3:2730cm-1) was determined to be 43±5 ps at 123 K by the time evolution of hot band. The transient bleachings and absorptions appeared when the D2O molecule was promoted to the vibrationally excited level of the OD stretching modes. Especially, the transient absorption at 2680 cm-1 has rapid decay time (≈15 ps) and it was assigned as the overtone between ν3 mode and vibrationally excited ν1 mode (2620 cm-1).

scholarly journals Coherent Exciton Dynamics in Ensembles of Size-Dispersed CdSe Quantum Dot Dimers Probed via Ultrafast Spectroscopy: A Quantum Computational Study

2020 ◽  
Vol 10 (4) ◽  
pp. 1328 ◽  
Author(s):  
Hugo Gattuso ◽  
Barbara Fresch ◽  
Raphael D. Levine ◽  
Françoise Remacle
Keyword(s):  
Transient Absorption ◽  
Computational Study ◽  
Laser Pulses ◽  
Transient Absorption Spectroscopy ◽  
Basis Set ◽  
Charge Migration ◽  
Pump Probe ◽  
Electronic Response ◽  
Charge Transfer Excitons ◽  
Interdot Coupling

Interdot coherent excitonic dynamics in nanometric colloidal CdSe quantum dots (QD) dimers lead to interdot charge migration and energy transfer. We show by electronic quantum dynamical simulations that the interdot coherent response to ultrashort fs laser pulses can be characterized by pump-probe transient absorption spectroscopy in spite of the inevitable inherent size dispersion of colloidal QDs. The latter, leading to a broadening of the excitonic bands, induce accidental resonances that actually increase the efficiency of the interdot coupling. The optical electronic response is computed by solving the time-dependent Schrodinger equation including the interaction with the oscillating electric field of the pulses for an ensemble of dimers that differ by their size. The excitonic Hamiltonian of each dimer is parameterized by the QD size and interdot distance, using an effective mass approximation. Local and charge transfer excitons are included in the dimer basis set. By tailoring the QD size, the excitonic bands can be tuned to overlap and thus favor interdot coupling. Computed pump-probe transient absorption maps averaged over the ensemble show that the coherence of excitons in QD dimers that lead to interdot charge migration can survive size disorder and could be observed in fs pump-probe, four-wave mixing, or covariance spectroscopy.

Single-shot transient absorption spectroscopy of an organic film

MRS Advances ◽  
2018 ◽  
Vol 3 (59) ◽  
pp. 3453-3457 ◽  
Author(s):  
Kelly S. Wilson ◽  
Madelyn N. Scott ◽  
Cathy Y. Wong
Keyword(s):  
Transient Absorption ◽  
Film Formation ◽  
Signal To Noise Ratio ◽  
Transient Absorption Spectroscopy ◽  
Organic Films ◽  
Single Shot ◽  
Organic Film ◽  
Pump Probe ◽  
Exciton Dynamics ◽  
Absorption Measurements

ABSTRACTWe report single-shot transient absorption (SSTA) measurements of an organic film of 3,3’-Diethyloxatricarbocyanine iodide (DOTCI). In SSTA, the pump-probe time delay is spatially encoded by using a tilted pump pulse. Translation of the sample during SSTA measurements averages over any spatial heterogeneity in the film. We demonstrate that exciton dynamics measured with the single-shot technique agrees with traditional transient absorption measurements of the same film. A signal-to-noise ratio of ∼40 is achieved in 10 s. The ability to measure exciton dynamics in organic films will enable future SSTA measurements of exciton dynamics during the molecular aggregation events that result in film formation.

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