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Showing 1 to 20 of 116 for “"Transient Absorption"”.
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Near infrared transient absorption spectra of photolyzed myoglobin at low temperatures
"We have measured the transient absorption spectrum of photolyzed sperm whale carboxymyoglobin as a function of temperature and time after photolysis. Our measurements extend from 60K to 220K and from three microseconds to thirty seconds. We see an absorption band near 758 nm which is known as band …
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Transient Absorption at Small Contact Times: The Diffusion of Carbon-Dioxide in Water
Made available in DSpace on 2014-12-05T17:15:42Z (GMT). No. of bitstreams: 1 6303255.pdf: 3114066 bytes, checksum: 45b5dc37add5d713e9904ed7e0069d1c (MD5) Previous issue date: 1962
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Femtosecond Laser Interactions In The Condensed Phase: Application to Transient Absorption and Materials Processing
… may be observed. Studies of solution phase transient absorption and femtosecond pulse laser ablation have been undertaken and in each case an experimental apparatus has been developed. Ultrafast pump-probe studies of room temperature solutions of 3-hydroxyflavone and a number of its …
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Ultrafast photophysics of transition metal coordination complexes studied with femtosecond extreme ultraviolet transient absorption spectroscopy
… using a homebuilt extreme ultraviolet (XUV) transient absorption apparatus. XUV photons are produced via high-harmonic generation, allowing M-edge XANES measurements to be performed as an in-lab technique. This developing technique is coupled with semi-empirical ligand field multiplet (LFM) …
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Ultrafast Transient Absorption and Multi-Wave Mixing Spectroscopies in the Extreme Ultraviolet and Soft X-RAY Regimes
… have emerged as pivotal in capturing these transient events with unprecedented temporal resolution. Advancements in ultrafast laser technology enable researchers to observe and manipulate electronic states within their natural attosecond, femtosecond, and picosecond timescales, thus …
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Decoupling bulk- and surface-limited lifetimes in thin kerfless silicon wafers using spectrally resolved transient absorption pump-probe spectroscopy and computer simulations
… surface passivation. Herein, spectrally resolved transient absorption pump-probe spectroscopy and extensive Technology Computer Aided Design simulations are used to decouple the bulk- and surface-limited lifetimes of thin kerfless silicon wafers in a single measurement. A range of sample …
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Ultrafast and Nonlinear Spectroscopy of Colloidal Nanomaterials
… regions and enhanced photothermal effect. Transient absorption measurements determine that the phonon-phonon scattering lifetime is considerably faster in the core-shell-shell nanoparticles than in the gold nanospheres and gold nanorods, which contributes to the higher photothermal …
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Nanoparticle-nanoparticle interactions and light-matter interaction studied by simulated absorption spectroscopy
… efficient tight-binding calculations, the absorption spectra of homodimer and heterodimer nanoparticles are explored. Then, plasmon-induced excitation energy transfer is simulated with an attosecond time step up to investigate processes occurring on the picosecond dynamics time scale. …
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Transient Photophysics of Bismuth Halide Semiconductors for Optoelectronic Applications
… materials for next-generation solar cells. I use transient absorption spectroscopy to show that the charge carrier lifetime in Cs2AgBiBr6 thin films is 1.4 μs. This is significantly longer than previous estimates based on time-resolved photoluminescence measurements, which measure the radiatively …
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Transient Rydberg Absorption Spectroscopy of Electron Beam Excited Rare Gases
Transient absorption spectra of molecular and atomic Rydberg transitions in the ultraviolet, visible, and near infrared (220 (LESSTHEQ) (lamda) (LESSTHEQ) 900 nm) spectral regions have been observed in electron beam exci- ted rare gases. The most prominent molecular bands for He(,2), Ne(,2),
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The Photochemistry of Beta-Naphthoyl Azide and 4-Acetylphenoxycarbonyl Azide: The Chemical and Physical Properties of Acylnitrenes
… optical, electron spin resonance, and transient absorption spectroscopy as well as by traditional chemical trapping techniques.
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Ultrafast linear and non-linear spectroscopy : from biological light-receptors to artificial light-harvesting systems
… in this work utilize femtosecond time-resolved transient absorption and transient grating as well as picosecond time-resolved fluorescence spectroscopy to investigate the photophysics and photochemistry of biological photoreceptors and address the light-induced excited-state processes in a …
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Nanoscale Thermal Transport at Solid -Liquid Interfaces
We also utilized the pump-probe transient absorption measurement to probe thermal transport in Au-core polymer-shell nanoparticles. The addition of an organic co-solvent to the suspension causes the polystyrene component of the polymer shell to swell and this change in the microstructure of the …
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A Nanosecond Laser Spectrophotometric and Product Investigation of the Chemistry of Fluorenylidene
… has also been presented for a reassignment of transient absorptions in the reported transient absorption spectrum, most notably, that in acetonitrile, a nitrile ylide has been observed, formed from the interaction of fluorenylidene with the solvent.
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Photochemistry, photophysics and spectroscopy of redox states of flavins relevant to photoactive flavoproteins
… FADH● and FAD●- with the visible to mid-IR transient absorption spectroscopy. Ground and excited state frequencies of the characteristic carbonyl modes are observed and assigned with the aid of DFT calculations. Moreover, the stable neutral radical flavin has been prepared for study in …
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Time-Resolved Studies of Aryl Carbenes
Picosecond transient absorption spectroscopy (using a Nd:YAG laser with 355 nm excitation and 440 nm to 640 nm probe) was used to study three aryl carbenes generated by photolysis of their parent diazo compounds in fluid solution. Irradiation of 9-diazofluorene generates a transient with an …
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Spectroscopic study of charge-separation dynamics in [pi]-conjugated systems
… extraction of excited-state populations from transient absorption measurements. Then, we investigate the properties of long-lived species in F8BT films through time-resolved photoluminescence (PL) and ultrafast transient absorption (TA) measurements. We show that singlet-singlet annihilation …
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Dynamics of UV -Excited Uracil, Thymine, and Cytosine
… of the time-resolved photoelectron spectrum, transient absorption, fluorescence, and reaction rates. With these findings, complete relaxation mechanisms are proposed for the pyrimidines and comparisons are made directly to experimental results.
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Charge recombination in organic small-molecule solar cells by Jiye Lee.
… loss needs to be minimized. First, we perform transient absorption spectroscopy to study the charge recombination dynamics of thin film bulk heterojunction of the archetype organic solar cell molecules, copper phthalocyanine (CuPC) and 3,4,9,10-perylenetetracarboxylic bis-benzimidazole (PTCBI). …
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Using the Marcus Inverted Region and Artificial Cofactors to Create a Charge Separated State in <i>De Novo</i> Designed Proteins
… rate of ET, TCSPC for fluorescence lifetime and transient absorption measurements at the picosecond timescale. v Protein constructs with viologens had their redox potentials determined through Dutton solution potentiometry and it was found that covalent attachment has little effect compared to …
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