Search Results - "Orr, Andrew J"

Ultraviolet Absorption Induces Hydrogen-Atom Transfer in G⋅C Watson-Crick DNA Base Pairs in Solution by Röttger, Katharina, Marroux, Hugo J. B., Grubb, Michael P., Coulter, Philip M., Böhnke, Hendrik, Henderson, Alexander S., Galan, M. Carmen, Temps, Friedrich, Orr-Ewing, Andrew J., Roberts, Gareth M.

“…Ultrafast deactivation pathways bestow photostability on nucleobases and hence preserve the structural integrity of DNA following absorption of ultraviolet…”
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Solvent Effects on Ultrafast Photochemical Pathways by Venkatraman, Ravi Kumar, Orr-Ewing, Andrew J

“…Conspectus Photochemical reactions are increasingly being used for chemical and materials synthesis, for example, in photoredox catalysis, and generally…”
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Ultrafast Observation of a Photoredox Reaction Mechanism: Photoinitiation in Organocatalyzed Atom-Transfer Radical Polymerization by Koyama, Daisuke, Dale, Harvey J. A., Orr-Ewing, Andrew J.

“…Photoredox catalysis has driven a revolution in the field of organic chemistry, but direct mechanistic insights into reactions of genuine synthetic utility…”
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Spin Changes Accompany Ultrafast Structural Interconversion in the Ground State of a Cobalt Nitrosyl Complex by Marroux, Hugo J. B., Curchod, Basile F. E., Faradji, Charly A., Shuttleworth, Timothy A., Sparkes, Hazel A., Pringle, Paul G., Orr‐Ewing, Andrew J.

“…Ultrafast, reversible intersystem crossing (ISC) is reported under ambient conditions for the electronic ground state of the pentacoordinate cobalt nitrosyl…”
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Singlet and Triplet Contributions to the Excited-State Activities of Dihydrophenazine, Phenoxazine, and Phenothiazine Organocatalysts Used in Atom Transfer Radical Polymerization by Bhattacherjee, Aditi, Sneha, Mahima, Lewis-Borrell, Luke, Amoruso, Giordano, Oliver, Thomas A.A, Tyler, Jasper, Clark, Ian P, Orr-Ewing, Andrew J

“…The photochemical dynamics of three classes of organic photoredox catalysts employed in organocatalyzed atom-transfer radical polymerization (O-ATRP) are…”
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An Experimental Evolution Test of the Relationship between Melanism and Desiccation Survival in Insects by Rajpurohit, Subhash, Peterson, Lisa Marie, Orr, Andrew J, Marlon, Anthony J, Gibbs, Allen G

“…We used experimental evolution to test the 'melanism-desiccation' hypothesis, which proposes that dark cuticle in several Drosophila species is an adaptation…”
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The Study of Reactive Intermediates in Condensed Phases by Carpenter, Barry K, Harvey, Jeremy N, Orr-Ewing, Andrew J

“…Novel experimental techniques and computational methods have provided new insight into the behavior of reactive intermediates in solution. The results of these…”
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Picosecond to millisecond tracking of a photocatalytic decarboxylation reaction provides direct mechanistic insights by Bhattacherjee, Aditi, Sneha, Mahima, Lewis-Borrell, Luke, Tau, Omri, Clark, Ian P., Orr-Ewing, Andrew J.

“…The photochemical decarboxylation of carboxylic acids is a versatile route to free radical intermediates for chemical synthesis. However, the sequential nature…”
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Virtual Issue on Photodissociation: From Fundamental Dynamics and Spectroscopy to Photochemistry in Planetary Atmospheres and in Space by Vallance, Claire, Orr-Ewing, Andrew J

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A complete parameterisation of the relative humidity and wavelength dependence of the refractive index of hygroscopic inorganic aerosol particles by Cotterell, Michael I, Willoughby, Rose E, Bzdek, Bryan R, Orr-Ewing, Andrew J, Reid, Jonathan P

“…Calculations of aerosol radiative forcing require knowledge of wavelength-dependent aerosol optical properties, such as single-scattering albedo. These aerosol…”
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Reaction Control in Synthetic Organic Photochemistry: Switching between [5+2] and [2+2] Modes of Cycloaddition by Roscini, Claudio, Cubbage, Kara L, Berry, Malcolm, Orr-Ewing, Andrew J, Booker-Milburn, Kevin I

“…Split personality: Reaction conditions that enable powerful control over the mode of photocycloaddition in maleimides have been developed. Direct irradiation…”
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On the Participation of Photoinduced N–H Bond Fission in Aqueous Adenine at 266 and 220 nm: A Combined Ultrafast Transient Electronic and Vibrational Absorption Spectroscopy Study by Roberts, Gareth M, Marroux, Hugo J. B, Grubb, Michael P, Ashfold, Michael N. R, Orr-Ewing, Andrew J

“…A combination of ultrafast transient electronic absorption spectroscopy (TEAS) and transient vibrational absorption spectroscopy (TVAS) is used to investigate…”
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Perspective: How can ultrafast laser spectroscopy inform the design of new organic photoredox catalysts for chemical and materials synthesis? by Orr-Ewing, Andrew J.

“…Photoredox catalysis of chemical reactions, using light-activated molecules which serve as electron donors or acceptors to initiate chemical transformations…”
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Temperature‐Dependence of the Rates of Reaction of Trifluoroacetic Acid with Criegee Intermediates by Chhantyal‐Pun, Rabi, McGillen, Max R., Beames, Joseph M., Khan, M. Anwar H., Percival, Carl J., Shallcross, Dudley E., Orr‐Ewing, Andrew J.

“…The rate coefficients for gas‐phase reaction of trifluoroacetic acid (TFA) with two Criegee intermediates, formaldehyde oxide and acetone oxide, decrease with…”
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Photofragmentation Dynamics in Solution Probed by Transient IR Absorption Spectroscopy: πσ-Mediated Bond Cleavage in p‑Methylthiophenol and p‑Methylthioanisole by Murdock, Daniel, Harris, Stephanie J, Karsili, Tolga N. V, Greetham, Gregory M, Clark, Ian P, Towrie, Michael, Orr−Ewing, Andrew J, Ashfold, Michael N. R

“…The 267 nm photodissociation dynamics of p-methylthiophenol (p-MePhSH) and p-methylthioanisole (p-MePhSMe) dissolved in CD3CN have been probed by subpicosecond…”
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Criegee Intermediate–Alcohol Reactions, A Potential Source of Functionalized Hydroperoxides in the Atmosphere by McGillen, Max R, Curchod, Basile F.E, Chhantyal-Pun, Rabi, Beames, Joseph M, Watson, Nathan, Khan, M. Anwar H, McMahon, Laura, Shallcross, Dudley E, Orr-Ewing, Andrew J

“…Ozonolysis, the mechanism by which alkenes are oxidized by ozone in the atmosphere, produces a diverse family of oxidants known as Criegee intermediates (CIs)…”
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Measurements of the evaporation and hygroscopic response of single fine-mode aerosol particles using a Bessel beam optical trap by Cotterell, Michael I, Mason, Bernard J, Carruthers, Antonia E, Walker, Jim S, Orr-Ewing, Andrew J, Reid, Jonathan P

“…A single horizontally-propagating zeroth order Bessel laser beam with a counter-propagating gas flow was used to confine single fine-mode aerosol particles…”
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Comparing molecular photofragmentation dynamics in the gas and liquid phases by Harris, Stephanie J, Murdock, Daniel, Zhang, Yuyuan, Oliver, Thomas A A, Grubb, Michael P, Orr-Ewing, Andrew J, Greetham, Gregory M, Clark, Ian P, Towrie, Michael, Bradforth, Stephen E, Ashfold, Michael N R

“…This article explores the extent to which insights gleaned from detailed studies of molecular photodissociations in the gas phase (i.e. under isolated molecule…”
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Ultrafast energy flow in the wake of solution-phase bimolecular reactions by Glowacki, David R., Rose, Rebecca A., Greaves, Stuart J., Orr-Ewing, Andrew J., Harvey, Jeremy N.

“…Vibrational energy flow into reactants, and out of products, plays a key role in chemical reactivity, so understanding the microscopic detail of the pathways…”
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Ab Initio Molecular Dynamics Study on the Electron Capture Processes of Protonated Methane (CH5 +) by Tachikawa, Hiroto, Orr-Ewing, Andrew J

“…Electron capture dynamics of protonated methane (CH5 +) have been investigated by means of a direct ab initio molecular dynamics (MD) method. First, the ground…”
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