Time-resolved spectroscopy ≈ Time-resolved spectroscopy
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Insights into the excitonic processes in polymeric photocatalysts Open
Photoexcitation processes of polymeric carbon nitride were systematically investigated by combining photoluminescence spectroscopy and ultrafast transient absorption spectroscopy, where the identified triplet–triplet annihilation is closel…
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Modeling of the spectroscopy of core electrons with density functional theory Open
The availability of X‐ray light sources with increased resolution and intensity has provided a foundation for increasingly sophisticated experimental studies exploiting the spectroscopy of core electrons to probe fundamental chemical, phys…
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Development of ultrafast time-resolved dual-comb spectroscopy Open
Ultrafast time-resolved dual-comb spectroscopy (TR-DCS) has been demonstrated, which enables direct observations of transient responses of complex optical spectra by combining dual-comb spectroscopy with the pump–probe method. TR-DCS achie…
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Comparison of rhenium–porphyrin dyads for CO<sub>2</sub>photoreduction: photocatalytic studies and charge separation dynamics studied by time-resolved IR spectroscopy Open
A new dyad for photocatalytic CO2reduction produces ten times more CO and much longer-lived charge-separation than earlier rhenium-porphyrin dyads.
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Dead-time correction of fluorescence lifetime measurements and fluorescence lifetime imaging Open
We present a comprehensive theory of dead-time effects on Time-Correlated Single Photon Counting (TCSPC) as used for fluorescence lifetime measurements, and develop a correction algorithm to remove these artifacts. We apply this algorithm …
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256 × 2 SPAD line sensor for time resolved fluorescence spectroscopy Open
We present a CMOS chip 256 × 2 single photon avalanche diode (SPAD) line sensor, 23.78 µm pitch, 43.7% fill factor, custom designed for time resolved emission spectroscopy (TRES). Integrating time-to-digital converters (TDCs) implement on-…
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Coherent two-dimensional fluorescence micro-spectroscopy Open
We have developed coherent two-dimensional (2D) fluorescence micro-spectroscopy which probes the nonlinear optical response at surfaces via fluorescence detection with sub-micron spatial resolution. This enables the investigation of micros…
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Optical characterization of porcine tissues from various organs in the 650–1100 nm range using time-domain diffuse spectroscopy Open
We present a systematic characterization of the optical properties (µ a and µ s ’) of nine representative ex vivo porcine tissues over a broadband spectrum (650-1100 nm). We applied time-resolved diffuse optical spectroscopy measurements f…
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Charge Transfer Kinetics in Halide Perovskites: On the Constraints of Time-Resolved Spectroscopy Measurements Open
Understanding photophysical processes in lead halide perovskites is an important aspect of optimizing the performance of optoelectronic devices. The determination of exact charge carrier extraction rate constants remains elusive, as there …
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High-resolution terahertz spectroscopy with quantum-cascade lasers Open
Terahertz (THz) quantum-cascade lasers (QCLs) are narrow band, high-power, and frequency-agile sources. These properties make them attractive for applications in high-resolution molecular and atomic spectroscopy. In the past few years, var…
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Probing Ultrafast Dynamics of Ferroelectrics by Time‐Resolved Pump‐Probe Spectroscopy Open
Ferroelectric materials have been a key research topic owing to their wide variety of modern electronic and photonic applications. For the quick exploration of higher operating speed, smaller size, and superior efficiencies of novel ferroe…
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Excitation-emission Fourier-transform spectroscopy based on a birefringent interferometer Open
The correlation of molecular excitation and emission events provides a powerful multidimensional spectroscopy tool, by relating transitions from electronic ground and excited states through two-dimensional excitation-emission maps. Here we…
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Tuning time and energy resolution in time-resolved photoemission spectroscopy with nonlinear crystals Open
Time- and angle-resolved photoemission spectroscopy is a powerful probe of electronic band structures out of equilibrium. Tuning time and energy resolution to suit a particular scientific question has become an increasingly important exper…
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Time-resolved fluorescence spectroscopy for clinical diagnosis of actinic cheilitis Open
Actinic cheilitis is a potentially malignant disorder of the lips. Its first cause is believed to be UV sun radiation. The lesion is highly heterogeneous, making the choice of area to be biopsied difficult. This study exploits the capabili…
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Ultrafast time-domain spectroscopy system using 10 GHz asynchronous optical sampling with 100 kHz scan rate Open
An ultrafast time-domain spectroscopy system employing asynchronous optical sampling at a repetition rate of 10 GHz is presented. Two ultra-compact Ti:sapphire femtosecond ring lasers allow to achieve scan rates as high as 100 kHz for a 10…
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Spectroscopic and Structural Probing of Excited-State Molecular Dynamics with Time-Resolved Photoelectron Spectroscopy and Ultrafast Electron Diffraction Open
Pump-probe measurements aim to capture the motion of electrons and nuclei on their natural timescales (femtoseconds to attoseconds) as chemical and physical transformations take place, effectively making “molecular movies” with short light…
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Probing the Energy Conversion Pathways between Light, Carriers, and Lattice in Real Time with Attosecond Core-Level Spectroscopy Open
Detection of the energy conversion pathways, between photons, charge\ncarriers, and the lattice is of fundamental importance to understand\nfundamental physics and to advance materials and devices. Yet, such insight\nremains incomplete due…
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Time-resolved spectroscopy at 19,000 lines per second using a CMOS SPAD line array enables advanced biophotonics applications Open
A SPAD-based line sensor fabricated in 130 nm CMOS technology capable of acquiring time-resolved fluorescence spectra (TRFS) in 8.3 milliseconds is presented. To the best of our knowledge, this is the fastest time correlated single photon …
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Using time-resolved photoelectron spectroscopy to unravel the electronic relaxation dynamics of photoexcited molecules Open
Time-resolved photoelectron spectroscopy measurements combined with quantum chemistry and dynamics calculations allow unprecedented insight into the electronic relaxation mechanisms of photoexcited molecules in the gas-phase.
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Frequency accurate coherent electro-optic dual-comb spectroscopy in real-time Open
Electro-optic dual-comb spectrometers have proved to be a promising technology for sensitive, high-resolution and rapid spectral measurements. Electro-optic combs possess very attractive features like simplicity, reliability, bright optica…
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Ultrafast Time-Resolved Hard X-Ray Emission Spectroscopy on a Tabletop Open
Experimental tools capable of monitoring both atomic and electronic structure on ultrafast (femtosecond to picosecond) time scales are needed for investigating photophysical processes fundamental to light harvesting, photocatalysis, energy…
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Time-resolved dual-comb measurement of number density and temperature in a laser-induced plasma Open
We utilize time-resolved dual-comb spectroscopy to measure the temporal evolution of the population number densities and absorption excitation temperature of Fe in a laser-induced plasma. The spectra of three excited-state transitions of F…
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Carrier lifetime of GeSn measured by spectrally resolved picosecond photoluminescence spectroscopy Open
We present an experimental setup capable of time-resolved photoluminescence spectroscopy for photon energies in the range of 0.51 to 0.56 eV with an instrument time response of 75 ps. The detection system is based on optical parametric thr…
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Fluorescence‐Detected Pump–Probe Spectroscopy Open
We introduce a new approach to transient spectroscopy, fluorescence‐detected pump–probe (F‐PP) spectroscopy, that overcomes several limitations of traditional PP. F‐PP suppresses excited‐state absorption, provides background‐free detection…
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An assessment of different electronic structure approaches for modeling time-resolved x-ray absorption spectroscopy Open
We assess the performance of different protocols for simulating excited-state x-ray absorption spectra. We consider three different protocols based on equation-of-motion coupled-cluster singles and doubles, two of them combined with the ma…
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Interaction of light with a non-covalent zinc porphyrin–graphene oxide nanohybrid Open
Fast electron transfer from the photoexcited ZnTPPH singlet state to GO sheets was detected by ultrafast time-resolved transient absorption spectroscopy.
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Technique for real-time tissue characterization based on scanning multispectral fluorescence lifetime spectroscopy (ms-TRFS) Open
We report a novel technique for continuous acquisition, processing and display of fluorescence lifetimes enabling real-time tissue diagnosis through a single hand held or biopsy fiber-optic probe. A scanning multispectral time-resolved flu…
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Fluorescence-detected Fourier transform electronic spectroscopy by\n phase-tagged photon counting Open
Fluorescence-detected Fourier transform (FT) spectroscopy is a technique in\nwhich the relative paths of an optical interferometer are controlled to excite\na material sample, and the ensuing fluorescence is detected as a function of\nthe …
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Mapping of Wave Packet Dynamics at Conical Intersections by Time- and Frequency-Resolved Fluorescence Spectroscopy: A Computational Study Open
Monitoring of wave packet dynamics at conical intersections by time- and frequency-resolved fluorescence spectroscopy has been investigated theoretically for a three-state two-mode model of a conical intersection coupled to a dissipative e…
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Using ultra-fast spectroscopy to probe the excited state dynamics of a reported highly efficient thermally activated delayed fluorescence chromophore Open
Multiple ultrafast spectroscopic techniques and quantum chemical simulations (QCS) were used to investigate the excited state dynamics of BCC-TPTA.