Article
Chemistry, Multidisciplinary
Pengtao Xu, Jin Suntivich
Summary: In situ stimulated Raman spectroscopy (SRS) is introduced as a method to monitor the evolution of electrochemical reactions with millisecond resolutions and enhanced sensitivity. The SRS methodology can identify generated chemicals during electrochemical reactions and observe the change in their concentration over time.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Computer Science, Artificial Intelligence
Kenichiro Tanaka, Nobuhiro Ikeya, Tsuyoshi Takatani, Hiroyuki Kubo, Takuya Funatomi, Vijay Ravi, Achuta Kadambi, Yasuhiro Mukaigawa
Summary: The method proposed in this study utilizes thermal imaging for time-resolved light transport decomposition, demonstrating its effectiveness and applicability through real-world experiments on black body, transparent, and translucent objects.
IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE
(2021)
Article
Nanoscience & Nanotechnology
Sara Mikaelsson, Jan Vogelsang, Chen Guo, Ivan Sytcevich, Anne-Lise Viotti, Fabian Langer, Yu-Chen Cheng, Saikat Nandi, Wenjie Jin, Anna Olofsson, Robin Weissenbilder, Johan Mauritsson, Anne L'Huillier, Mathieu Gisselbrecht, Cord L. Arnold
Summary: Attosecond pulses, produced through high-order harmonic generation in gases, have been used to observe ultrafast electron dynamics, overcoming limitations of low repetition rates. By using short pulse trains, experiments have been conducted on single-photon double ionization of helium with full angular resolution.
Article
Multidisciplinary Sciences
Te Ma, Tetsuya Inagaki, Satoru Tsuchikawa
Summary: This study developed a time-resolved transmittance spectroscopic method to validate the light scattering changing characteristics in kiwifruit during shelf-life and in cold storage conditions, and successfully formulated a mathematical model to classify the stages of kiwifruit softening.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Yushmantha Ishan Kalpa de Silva Thuiya Hennadige, Proity Nayeeb Akbar, Reinhold Bluemel
Summary: A new method is proposed to extract the complex index of refraction from the extinction efficiency of dielectric spheres. It removes scattering effects and corrects for systematic errors in the measured extinction spectra. The method does not require a reference spectrum and satisfies the Kramers-Kronig relations. It can provide unambiguous interpretation of the chemical information of the sample.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Alberto Ghezzi, Armin J. M. Lenz, Fernando Soldevila, Enrique Tajahuerce, Vito Vurro, Andrea Bassi, Gianluca Valentini, Andrea Farina, Cosimo D'Andrea
Summary: In this work, we propose a time-resolved multispectral fluorescence microscopy system based on the Single-Pixel Camera (SPC) scheme, which achieves high resolution and short measurement time using Compressive Sensing (CS) technology. Data Fusion (DF) with a high-resolution camera is used to address the low spatial resolution issue typical of SPC. By integrating hardware and algorithms, this system reduces the number of measurements while preserving the information content, allowing for a zoom feature without moving the optical system. The system is characterized in terms of spatial, spectral, and temporal properties, and is validated on a cellular sample.
Article
Multidisciplinary Sciences
Sang Jin Lee, Tae Wu Kim, Jong Goo Kim, Cheolhee Yang, So Ri Yun, Changin Kim, Zhong Ren, Indika Kumarapperuma, Jane Kuk, Keith Moffat, Xiaojing Yang, Hyotcherl Ihee
Summary: This study investigates the light-induced structural transitions of bacteriophytochromes in a liquid solution phase using time-resolved x-ray solution scattering. It reveals the kinetic analysis of the structural species and provides mechanistic insights into how these photoreceptors transmit structural signals and regulate downstream biological responses.
Article
Biochemical Research Methods
Michael Helton, Mary-Ann Mycek, Karthik Vishwanath
Summary: Measurements of time-resolved reflectance from a homogenous turbid medium can provide the absolute values of its optical transport coefficients. Three reconstruction approaches were examined to avoid direct measurements of photon launch times, and it was found that they can reduce errors.
BIOMEDICAL OPTICS EXPRESS
(2022)
Article
Chemistry, Physical
Mohamed E. A. Ibrahim, Rene A. Nome
Summary: This study investigates the application of time-dependent optical measurements of spectra, scattering, and imaging in understanding heterogeneous reactions compared to homogeneous reactions. Using the disproportionation of hydrogen peroxide by potassium permanganate as a model reaction, the entire spectrum is measured over the reaction time, allowing for clear correlation analysis and identification of chemical species in heterogeneous conditions. Time-dependent dynamic light scattering is employed to study the kinetics and equilibrium of oxygen nanobubble product formation. Macroscopic video-rate reaction imaging and information-theoretic analysis are performed to characterize the contributions of reaction and transport to the observed signal. The differences between measuring sample subsets and the entire system are illustrated through stochastic and macroscopic numerical simulations of reaction-diffusion for homogeneous and heterogeneous reaction conditions. The tools presented in this study may aid in understanding other chemical reactions under similar conditions.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Physics, Applied
Nizar Chaouachi, Sihem Jaziri
Summary: We develop a theoretical study to evaluate the dynamic photoemission spectrum of exciton steady-states in monolayer transition metal dichlacogenides. The effect of dielectric environment on exciton binding energies is discussed. Coherent coupling between 1s and 2s excitons and quantum beat phenomena are observed.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Wenhao Zheng, Nicolas F. Zorn, Mischa Bonn, Jana Zaumseil, Hai Wang
Summary: This study investigated the microscopic and temperature-dependent charge transport properties of pristine and functionalized carbon nanotubes using ultrafast spectroscopy. The results showed that functionalization increased charge carrier scattering, leading to a decrease in intra-nanotube carrier mobility. Electrical measurements further distinguished the contributions of different factors to the overall charge transport properties.
Article
Chemistry, Physical
Kyle Acheson, Adam Kirrander
Summary: An inversion method based on forward-optimization in a trajectory basis is introduced for time-resolved data from ultrafast experiments. The method is applied to experimental data from X-ray scattering and electron diffraction of photochemical reactions. The inversion yields a model that reproduces the experimental data, identifies the main dynamic motifs, and agrees with independent experimental observations. Notably, the method considers continuity constraints and is robust even for noisy data.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Biochemical Research Methods
Seva Ioussoufovitch, David Jonathan Fulop Cohen, Daniel Milej, Mamadou Diop
Summary: The study introduces a TR spectrometer architecture based on compressed sensing and time-correlated single-photon counting to address the challenges of quantifying light absorbers in highly scattering media. Experimental results demonstrate that the method can more accurately quantify absorption changes in tissue-mimicking samples and exhibits superior depth sensitivity.
BIOMEDICAL OPTICS EXPRESS
(2021)
Article
Chemistry, Physical
Marcin Pastorczak, Michal Nejbauer, Naoki Shinyashiki, Masanobu Takatsuka, Gonzalo Angulo, Yuriy Stepanenko, Czeslaw Radzewicz
Summary: The study observed for the first time the sub-nanosecond stage of the coil-to-globule transition of a polymer in water, which was made possible by a novel experimental approach. The increase in light scattering intensity around 300-400 ps after a temperature jump above the LCST suggests the rapid formation of local nuclei along the polymer chain in the observed stage of the transition.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
James D. Firth, L. Anders Hammarback, Thomas J. Burden, Jonathan B. Eastwood, James R. Donald, Chris S. Horbaczewskyj, Matthew T. McRobie, Adam Tramaseur, Ian P. Clark, Michael Towrie, Alan Robinson, Jean-Philippe Krieger, Jason M. Lynam, Ian J. S. Fairlamb
Summary: The manganese-mediated borylation of aryl/heteroaryl diazonium salts is a versatile and general synthetic method for synthesizing boronate esters. Determining the responsible Mn species in the photochemical reaction processes is crucial, depending on the presence of a suitable oxidant. This finding has significant potential for numerous processes utilizing Mn-containing carbonyl species in synthetic applications.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)