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Global Data-Driven Determination of Baryon Transition Form Factors.
Phys Rev Lett
September 2024
Institute for Nuclear Studies and Department of Physics, The George Washington University, Washington, DC 20052, USA.
Hadronic resonances emerge from strong interactions encoding the dynamics of quarks and gluons. The structure of these resonances can be probed by virtual photons parametrized in transition form factors. In this study, twelve N^{*} and Δ transition form factors at the pole are extracted from data with the center-of-mass energy from πN threshold to 1.
View Article and Find Full Text PDFPhotodissociation of CO2 via the 1Πg state: Wavelength-dependent imaging studies of O(1D2) photoproducts.
J Chem Phys
January 2024
Hangzhou Institute of Advanced Studies, Zhejiang Normal University, 1108 Gengwen Road, Hangzhou 311231, Zhejiang Province, People's Republic of China.
Photodissociation of CO2 via the 1Πg state is investigated using a time-sliced velocity-mapped ion imaging apparatus combined with a tunable vacuum ultraviolet photolysis source. The main O(1D2) + CO(X1Σ+) channel is directly observed from the measured images of O(1D2) photoproducts at 129.08-134.
View Article and Find Full Text PDFDifferent biological effects of exposure to far-UVC (222 nm) and near-UVC (254 nm) irradiation.
J Photochem Photobiol B
June 2023
Brazilian Biosciences National Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), Zip Code 13083-970, Campinas, Sao Paulo, Brazil. Electronic address:
Ultraviolet C (UVC) light has long been used as a sterilizing agent, primarily through devices that emit at 254 nm. Depending on the dose and duration of exposure, UV 254 nm can cause erythema and photokeratitis and potentially cause skin cancer since it directly modifies nitrogenated nucleic acid bases. Filtered KrCl excimer lamps (emitting mainly at 222 nm) have emerged as safer germicidal tools and have even been proposed as devices to sterilize surgical wounds.
View Article and Find Full Text PDFDetermining the gluonic gravitational form factors of the proton.
Nature
March 2023
Department of Physics, Duke University, Durham, NC, USA.
The proton is one of the main building blocks of all visible matter in the Universe. Among its intrinsic properties are its electric charge, mass and spin. These properties emerge from the complex dynamics of its fundamental constituents-quarks and gluons-described by the theory of quantum chromodynamics.
View Article and Find Full Text PDFPhotodissociation Spectroscopy and Photofragment Imaging of the Fe(Acetylene) Complex.
J Phys Chem A
February 2023
Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States.
Tunable laser photodissociation spectroscopy in the 700-400 nm region and photofragment imaging experiments are employed to investigate the Fe(acetylene) ion-molecule complex. At energies above a threshold at 679 nm, continuous dissociation is detected throughout the visible wavelength region, with regions of broad structure. Comparison to the spectrum predicted by time-dependent density functional theory (TD-DFT) indicates that the complex has a quartet ground state.
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