A spectroscopy technique that offers advances in detection of toxic chemicals and counting of molecules has been demonstrated by a National Institute of Standards and Technology (NIST) scientist and collaborators. Described in the Feb. 8 issue of the Journal of Chemical Physics, the NIST-patented technique may be useful for development of miniaturized chemical sensors, as well as for fundamental surface science studies.
The technique (a variation on cavity ring-down spectroscopy) relies on laser light reflecting and circulating inside a prism-like optical resonator. The time it takes the light to diminish (or ring down) changes depending on whether specific chemicals are present near the resonator and on how much light they absorb. This information can be used to identify and quantify specific molecules.
The technique can detect small amounts (100 parts per million) of trichloroethylene, a toxic commercial solvent that is prevalent but difficult to locate in the environment. The sensitivity is equivalent to the best of other published optical methods that could be used outside a laboratory. A highly selective coating is expected to enhance performance further.
Laura Ost | EurekAlert!
Further Improvement of Qubit Lifetime for Quantum Computers
09.12.2016 | Forschungszentrum Jülich
Electron highway inside crystal
09.12.2016 | Julius-Maximilians-Universität Würzburg
Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.
Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
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