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The research in the Bradforth group centers on understanding the ultrafast dynamics of chemical reactions in solution and in complex condensed phase systems. The common strand in their experiments is to explore the coupling of the dynamics of the nuclei (e.g. vibrations, bond formation/breaking and solvent motion) to a given non-adiabatic electronic process. The time scales for these non-adiabatic processes are on the order of 100 fs; likewise the timescales of nuclear motions are 10 fs - 1 ps. In a condensed environment, this allows only a short time window to explore the system evolution and catch the newly-formed products before complete relaxation. Femtosecond spectroscopy is therefore the appropriate experimental technique to elucidate the dynamics.
Experimental projects using ultrafast spectroscopy in the Bradforth group include (i) probing the primary pathways for electron ionization and detachment in liquid water (ii) investigating chemistry initiated by ejection of an ultrafast electron, (iii) the influence of solvent on bond dissociation dynamics and on rotational relaxation initiated by photodissociation, (iv) determining pathways of energy migration of an electronic excitation through an organized architecture of chromophores such as DNA. Strong connection with current theory is emphasized in all projects. In addition, we are engaged in several collaborative projects with theoreticians in the areas of electronic structure and quantum dynamics of solutes in bulk liquids.
Experimental projects using ultrafast spectroscopy in the Bradforth group include (i) probing the primary pathways for electron ionization and detachment in liquid water (ii) investigating chemistry initiated by ejection of an ultrafast electron, (iii) the influence of solvent on bond dissociation dynamics and on rotational relaxation initiated by photodissociation, (iv) determining pathways of energy migration of an electronic excitation through an organized architecture of chromophores such as DNA. Strong connection with current theory is emphasized in all projects. In addition, we are engaged in several collaborative projects with theoreticians in the areas of electronic structure and quantum dynamics of solutes in bulk liquids.
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Tatiana Nemirovich, Brandon Young,Krystof Brezina,Philip E. Mason,Robert Seidel,Dominik Stemer,Bernd Winter,Pavel Jungwirth,Stephen E. Bradforth, H. Christian Schewe
The Journal of chemical physicsno. 17 (2023)
Michael Kellogg, Austin Mencke,Collin Muniz, Thabassum Ahammad, Fabiola Cardoso-Delgado, Nina Baluyot-Reyes, Marielle Sewell,Matthew Bird,Stephen Bradforth,Mark Thompson
crossref(2023)
JOURNAL OF THE AMERICAN CHEMICAL SOCIETYno. 2 (2023): 1470-1471
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ACCOUNTS OF CHEMICAL RESEARCHno. 6 (2023): 623-624
arXiv (Cornell University) (2023)
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Abdulrahman M Alfaraidi,Jonas Schaab,Eric T McClure, Michael Kellogg, Taylor L Hodgkins,Muazzam Idris,Stephen E Bradforth,Brent C Melot,Mark E Thompson,Peter I Djurovich
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The journal of physical chemistry lettersno. 44 (2023): 9864-9871
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Laura Estergreen, Austin R Mencke,Daniel E Cotton, Nadia V Korovina,Josef Michl,Sean T Roberts,Mark E Thompson,Stephen E Bradforth
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