photoexcitation


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photoexcitation

(ˌfəʊtəʊˌɛksɪˈteɪʃən)
n
(Chemistry) chem physics the creation of an increase in energy in atoms, molecules or ions caused by the absorption of a photon
References in periodicals archive ?
(2014) proposed that oxybenzone undergoes an electron-driven internal conversion to its keto-tautomer as an ultrafast relaxation pathway upon photoexcitation as the central mechanisms for its protective activity.
The principal mechanism of UVTiO2 photocatalytic reaction is delineated in Fig 1, which normally clarified in three steps: i) photoexcitation of electron-hole pairs; ii) transformation of charge; iii) depletion of charges for redox reactions.
Iscqum will allow implementing crucial advances: I) extending our photoexcitation to the far-infrared for creating few-cycles electromagnetic pulses and exciting structural or electronic collective modes; Ii) upgrading our detection to higher sensitivity and spatial resolution, Extending our ability to image spin and charge distributions.
This process of electron-hole pair generation is known as photoexcitation. Photoexcited electrons can be utilized in the reduction of oxygen, and similarly, holes can be utilized in oxidizing water molecules which are adsorbed on photocatalyst surface.
Curiously, recent ultrafast spectroscopic measurements on optimized polymer:fullerene-based OPV systems indicate that charge carriers begin to appear [less than or equal to] 100fs following photoexcitation [2, 12, 15, 19-22].
Khare, "Coupling of piezoelectric, semiconducting and photoexcitation properties in NaNb[O.sub.3] nanostructures for controlling electrical transport: realizing an efficient piezo-photoanode and piezo-photocatalyst," Nano Energy, vol.
Due to the push-pull interaction, efficient internal charge transfer (ICT) can take place from the donor (D) to the acceptor (A) upon photoexcitation, thus leading to a new absorption band at longer wavelengths [15] and producing appropriate molecular energy levels for high [V.sub.oc], good charge transport, and high [J.sub.SC], thus improving PCE [16].
Jensen et al., "Photoexcitation cascade and multiple hot carrier generation in graphene," in 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC, Munich, Germany, May 2013.
It is also well known that some [beta]-carboline derivates on photoexcitation induce chromosomal damages in mammal cells and may disarm viruses and bacteria [17].
Energy transfer in the photoexcitation of [Sm.sup.3+]-implanted Ti[O.sub.2] thin films.
The unit cell was kept at dark dry cabinet to prevent surging current due to photoexcitation.