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Photoexcitation
About: Photoexcitation is a research topic. Over the lifetime, 5874 publications have been published within this topic receiving 134733 citations.
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TL;DR: Following 157 nm photoexcitation of amorphous solid water and polycrystalline water ice, photodesorbed water molecules, in the ground vibrational state, have been observed using resonance-enhanced multiphoton ionization detection methods and the measured energy distributions are in good accord with those predicted by classical molecular dynamics calculations.
Abstract: Following 157 nm photoexcitation of amorphous solid water and polycrystalline water ice, photodesorbed water molecules H2O and D2O, in the ground vibrational state, have been observed using resonance-enhanced multiphoton ionization detection methods. Time-of-flight and rotationally resolved spectra of the photodesorbed water molecules were measured, and the kinetic and internal energy distributions were obtained. The measured energy distributions are in good accord with those predicted by classical molecular dynamics calculations for the kick-out mechanism of a water molecule from the ice surface by a hot hydrogen deuterium atom formed by photodissociation of a neighboring water molecule. Desorption of D2O following 193 nm photoirradiation of a D2O /H2S mixed ice was also investigated to provide further direct evidence for the operation of a kick-out mechanism. © 2010 American Institute of Physics. doi:10.1063/1.3386577
40 citations
TL;DR: The photogeneration charge carrier quantum yield and mobility in atomically thin colloidal InSe nanosheets is determined by ultrafast transient terahertz (THz) spectroscopy and a near unity quantum yield of free charge carriers is determined for low photoexcitation density.
Abstract: The implementation of next generation ultrathin electronics by applying highly promising dimensionality-dependent physical properties of two-dimensional (2D) semiconductors is ever increasing. In this context, the van der Waals layered semiconductor InSe has proven its potential as photodetecting material with high charge carrier mobility. We have determined the photogeneration charge carrier quantum yield and mobility in atomically thin colloidal InSe nanosheets (inorganic layer thickness 0.8–1.7 nm, mono/double-layers, ≤ 5 nm including ligands) by ultrafast transient terahertz (THz) spectroscopy. A near unity quantum yield of free charge carriers is determined for low photoexcitation density. The charge carrier quantum yield decreases at higher excitation density due to recombination of electrons and holes, leading to the formation of neutral excitons. In the THz frequency domain, we probe a charge mobility as high as 20 ± 2 cm2/(V s). The THz mobility is similar to field-effect transistor mobilities ex...
40 citations
TL;DR: In this article, a non-degenerate ground-state poly(3, n-hexylthiophene) in solution was reported to have a relatively short-lived luminescence decay that is relatively shortlived (∼600 ps).
40 citations
40 citations
TL;DR: The results presented here suggest that the ESIPT process of the SA molecule in the excited state can be attributed to the electronegativity change of O1 induced by excitation.
40 citations