singlet


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Related to singlet: Singlet oxygen, Singlet state

singlet

1. Physics a multiplet that has only one member
2. Chem a chemical bond consisting of one electron
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

singlet

[′siŋ·glət]
(quantum mechanics)
An energy level that is not split by a relatively weak interaction, and thus is not a multiplet or a member of a multiplet.
(spectroscopy)
A spectral line that cannot be resolved into components at even the highest resolution.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Nelson, "Singlet oxygen scavengers affect laser-dye impairment of endothelium-dependent responses of brain arterioles," American Journal of Physiology, vol.
This panel of assays has led to the term, Oxygen Radical Absorbance Capacity using Multiple Radicals (ORAC-MR), which is a sum of the antioxidant capacity against six of the most predominant reactive species found in the human body: ROS (peroxyl radical, hydroxyl radical, superoxide anion, singlet oxygen), RNS (peroxynitrite) and RCS (hypochlorite).
Hence, in this work the reaction mechanism of sulfur atom reaction with [O.sub.4] molecule on the singlet potential energy surface are investigated.
Photoirradiation of porphyrins at selective wavelengths of visible light (450-700 nm) leads to the photochemical conversion of molecular oxygen ([sup.3][O.sub.2]) into singlet oxygen ([sup.1][O.sub.2]), an especially efficacious cytotoxic agent that leads to apoptosis or necrosis [11].
When the material is very dilute, the distance between molecules is large and singlet fission does not occur.
This study reports the removal of organic dye (pollutants) with a system consisting of a 5% solution of sodium hypochlorite (commercial grade), oxygen gas, and a supported copper oxide catalyst to generate singlet oxygen.
After absorption of a photon of light, a molecule of the photosensitizer in its ground singlet state is excited to the singlet state (S) and receives the energy of the photon.
Pyropheophorbide methyl ester (PPME), as with other sensitizers, induced a biological damage depends on the singlet oxygen generation and other radicals of the reactive species of the molecular oxygen, (MacDonald et al., 1999; Al-Omari et al., 2008; Kanony et al., 2003) and thus depends on the availability of molecular oxygen in its triplet ground state and the illumination of the treatment light.
Following the Dellinger meet, the singlets will be auctioned online at www.goducks.com.
Classic, edgey, 50's rock pin-up Describe your look from head to toe: DIY - leather jacket from New Look, vintage denim skirt from London, singlet and tights from Primark, boots from River Island, accessories by Tiffanies What's your favourite shop?
When we entered the water-- I in my shift and him in a singlet with buttons he claimed were mother-of-pearl--he stepped first into the shallows, but I plunged deep, fish-supple, into the slow current's cold.