Standoff trace chemical sensing via manipulation of excited electronic state lifetimes.

Standoff alpha radiation detection via excited state absorption of air

Non-radiative processes in protonated diazines, pyrimidine bases and an aromatic azine.

The excited state lifetimes of DNA bases are often very short due to very efficient non-radiative processes assigned to the ππ*-nπ* coupling. A set of protonated aromatic diazine molecules (pyridazine, pyrimidine and pyrazine C4H5N2(+)) and protonated pyrimidine DNA bases (cytosine, uracil and thymine), as well as the protonated pyridine (C5H6N(+)), have been investigated. For all these molecul...

Experiment 1: Excited-state properties of 2-naphthol (the acidity constants)

The electronic structure of a molecule determines such physical and chemical properties as its charge distribution, geometry (and therefore the dipole moment), ionization potential, electron affinity, and of course, chemical reactivity. If the electronic structure of a molecule were to be changed, one would expect its physical and chemical properties to be altered. Such a rearrangement can occu...

Experiment 6a: Excited-state properties of 2-naphthol (the acidity constants)

The electronic structure of a molecule determines such physical and chemical properties as its charge distribution, geometry (and therefore the dipole moment), ionization potential, electron affinity, and of course, chemical reactivity. If the electronic structure of a molecule were to be changed, one would expect its physical and chemical properties to be altered. Such a rearrangement can occu...

Optical sensing and imaging of trace oxygen with record response.

Dioxygen is one of the key molecules on Earth. It plays an essential role in the atmosphere, the hydrosphere, the geosphere and not the least the biosphere. Many physiological transformations, chemical reactions, and (bio)technological processes produce or consume O2, while anoxic species, numerous chemical syntheses, and manufacturing protocols demand its complete absence. Its extraterrestrial...