Is this you? As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.
Claim your profile
Articles by Eric Heller
Physics > Chemical Physics
Nitrite photochemistry in atmospheric aerosols and natural waters is a major source of hydroxyl radicals and reactive nitrogen oxides. Contrary to the prevailing view that in the environment aqueous nitrite photochemistry proceeds exclusively through photoexcitation followed by homolytic bond cleavage, we show that visible light directly ionizes aqueous nitrite in individual micron-sized droplets.
Exploring the effects of quantum decoherence on the excited-state dynamics of molecular systems
Fewest-switches surface hopping (FSSH) is employed in order to investigate the nonadiabatic excited-state dynamics of thiophene and related compounds and hence to establish a connection between the electronic system, the critical points in configuration space and the deactivation dynamics. The potential-energy surfaces of the studied molecules were calculated with complete active space self-consistent field and time-dependent density-functional theory.
Rise and Fall of Anderson Localization by Lattice Vibrations: A Time-Dependent Machine Learning Approach
All articles published by MDPI are made immediately available worldwide under an open access license. No special permission is required to reuse all or part of the article published by MDPI, including figures and tables. For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. For more information, please refer to https://www.mdpi.com/openaccess.
Heavy-atom tunnelling in singlet oxygen deactivation predicted by instanton theory with branch-point singularities - Nature Communications
Abstract The reactive singlet state of oxygen (O2) can decay to the triplet ground state nonradiatively in the presence of a solvent. There is a controversy about whether tunnelling is involved in this nonadiabatic spin-crossover process. Semiclassical instanton theory provides a reliable and practical computational method for elucidating the reaction mechanism and can account for nuclear quantum effects such as zero-point energy and multidimensional tunnelling.
Competing quantum effects in heavy-atom tunnelling through conical intersections
Competing quantum effects in heavy-atom tunnelling through conical intersections† Thermally activated chemical reactions are typically understood in terms of overcoming potential-energy barriers. However, standard rate theories break down in the presence of a conical intersection (CI) because these processes are inherently nonadiabatic, invalidating the Born–Oppenheimer approximation.
Skyfall när Timrå IK sprang igång säsongen
Timrå IK:s försäsong 1 augusti 2023 15:43 Timråspelarna är tillbaka från semestern. Under tisdagen väntade fystester i form av löpning på "Grytan". ST Sporten var på plats i det regniga vädret. Annons +AlltDigital Därefter 199 kr/månad. Ingen bindningstid. Avsluta när du vill. Detta ingår i +Allt: Alla artiklar – på tidningenangermanland.se, i nyhetsappen och i nyhetsbrev. Över 40 lokala nyhetssajter och appar – från Sydsvenskan i söder till Östersunds-Posten i norr.
Cykel-Nisse, 85, slutar aldrig laga cyklar - gästar Loosveckan
Loosveckan 2023 20 juli 2023 13:00 Profilen Nisse "Cykel-Nisse" Jonsson sålde visserligen sin verkstad i Arbrå för snart tio år sedan. Trots det har han inga tankar på att sluta reparera cyklar. – Annars vet jag inte vad jag hade gjort om dagarna, säger den 85-årige cykelreparatören. I morgon fredag gör han ett gästspel på Lotta-Boden i Los. Annons Nisse "Cykel-Nisse" Jonsson drev i flera decennier sin egen cykelverkstad i Sundsvall, där han etablerade sig som en av stadens profilen.
Cykel-Nisse slutar aldrig laga cyklar: "Tar det år för år"
Arbrå 20 juli 2023 12:16 Arbråprofilen Nisse "Cykel-Nisse" Jonsson sålde visserligen sin verkstad för snart tio år sedan. Trots det har han inga tankar på att sluta reparera cyklar. – Annars vet jag inte vad jag hade gjort om dagarna, säger den 85- årige cykelreparatören. Annons Nisse "Cykel-Nisse" Jonsson drev i flera decennier sin egen cykelverkstad i Sundsvall, där han etablerade sig som en av stadens profilen. +AlltDigital Därefter 199 kr/månad. Ingen bindningstid. Avsluta när du vill.
Cykel-Nisse slutar aldrig laga cyklar: "Tar det år för år"
Arbrå 20 juli 2023 12:16 Arbråprofilen Nisse "Cykel-Nisse" Jonsson sålde visserligen sin verkstad för snart tio år sedan. Trots det har han inga tankar på att sluta reparera cyklar. – Annars vet jag inte vad jag hade gjort om dagarna, säger den 85- årige cykelreparatören. Annons Nisse "Cykel-Nisse" Jonsson drev i flera decennier sin egen cykelverkstad i Sundsvall, där han etablerade sig som en av stadens profilen. +AlltDigital Därefter 199 kr/månad. Ingen bindningstid. Avsluta när du vill.
Cykel-Nisse slutar aldrig laga cyklar: "Tar det år för år"
Arbrå 20 juli 2023 11:00 Arbråprofilen Nisse "Cykel-Nisse" Jonsson sålde visserligen sin verkstad för snart tio år sedan. Trots det har han inga tankar på att sluta reparera cyklar. – Annars vet jag inte vad jag hade gjort om dagarna, säger den 85- årige cykelreparatören. Annons Nisse "Cykel-Nisse" Jonsson drev i flera decennier sin egen cykelverkstad i Sundsvall, där han etablerade sig som en av stadens profilen. +AlltDigital Därefter 199 kr/månad. Ingen bindningstid. Avsluta när du vill.
Polisen rekryterar 30 civila IT- specialister
Västernorrlands län 10 juli 2023 11:02 Polisområde Nord anställer 30 nya IT- specialister för att höja polisens förmåga inom bland annat kameraövervakning och digital brottslighet. – Kompentensen vi letar efter finns ofta i det civila samhället, det är inga typiska saker man lär sig på polisutbildningen, säger Micael Säll Lindahl, regionalpolischef i Norr.
Density of Avoided Crossings and Diabatic Representation
1. Introduction Bloch’s theorem and translational symmetry are two of the main bricks in the foundation of solid state physics. Their use in crystal lattices makes an implicit assumption, not emphasized in the texts we are aware of. Bloch’s theorem is mathematically correct of course for a fixed, periodic potential, but real nuclei move under the influence of thermal fluctuations, so that they have random configuration without translational symmetry at any moment in time.
Instanton theory for Fermi’s golden rule and beyond
1. Introduction The Born–Oppenheimer approximation is widely used to simplify the Schrödinger equation for molecular systems by expressing the equations of motion in terms of a single adiabatic potential-energy surface (PES). However, there are many molecular processes for which this adiabatic approximation is not valid, typically due to two PESs becoming close in energy. In these situations, alternative approaches are necessary.
Spin Crossover of Thiophosgene via Multidimensional Heavy-Atom Quantum Tunneling
Introduction Reactions involving the transition between electronic states of different spin, often called intersystem crossing or spin crossovers, are widespread throughout nature. As an essential process of photochemistry, (1−7) they play key roles in various scientific fields such as organic light-emitting diodes, (8) synthetic chemistry, (9,10) controlling magnetic properties of materials, (11−15) and photodynamic therapy of cancer and other skin diseases.
Branched flow
Small causes can have large downstream effects. That idea is the foundation of chaos theory. But chaos needs time and space to develop, and fascinating behavior can happen on the way. As a directed wave or a collection of rays, such as light, travels through an almost homogeneous medium, even minute random variations in the medium can lead the wave and the rays to branch off and cause extreme intensity fluctuations. That phenomenon is known as branched flow.
A perspective on the electro-thermal co-design of ultra-wide bandgap lateral devices
Article Metrics Views 1,356 Citations Crossref 0 Web of Science ISI 0 Altmetric Please Note: The number of views represents the full text views from December 2016 to date. Article views prior to December 2016 are not included.
How to Distinguish Journalism from Fake News
Flattening the propaganda curve in the age of the coronavirus Photo by Kayla Velasquez on Unsplash As we struggle to rationalize the minute-by-minute dread of this unfolding pandemic, the Washington Post ran one of the most surreal and outright alarming articles yet: “Coronavirus modelers factor in new public health risk: Accusations their work is a hoax.” It’s not enough that we’re being attacked by a pernicious and unseen virus from the outside: we are creating a self-made enemy by denying...
Nanoscale electro-thermal interactions in AlGaN/GaN high electron mobility transistors
Search in: This Publication Anywhere This Publisher/Society
John Polkinghorne — Quarks and Creation
KRISTA TIPPETT, HOST: My guest this hour is physicist and theologian John Polkinghorne. He explains how he applies the deepest insights of quantum physics to religious mysteries — and finds new ways to think about prayer, evil, evolution, and the afterlife. John Polkinghorne's perspective largely transcends popularized arguments that set scientific reason and religion at odds.
Quantum Chaos: An Introduction
Quantum chaos is the study of the quantum dynamics of systems that are classically chaotic. Contrary to the impression left by most textbooks, almost all conservative dynamical systems are at least partly chaotic in the range of their behavior. This applies to molecules, nuclei, quantum dots, acoustical systems, and dozens of other systems. The field of quantum chaos is still young, growing fast, and rich in conceptual, computational, and experimental challenges.
Show More
loading
Actions
Is this you?
As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.Get in touch with Eric
Contact Eric, search articles and posts on X, monitor coverage, and track replies from one place.
Learn more about Muck Rack