Optically tailored access to metastable electronic states

David L. Andrews, David S. Bradshaw

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On irradiating a molecular system with a laser beam of ultraviolet or visible frequency, photon absorption occurs when an electronic state is at a suitable energy level relative to an initial state. Despite meeting this criterion, interesting metastable states can remain inaccessible because of symmetry constraints. In this Letter a mechanism, based on the input of an off-resonant beam, is shown to enable the population of such states. This is achievable because the laser-modified process involves different selection rules compared to conventional photon absorption. The effects of applying the stimulus beam to either a one- or two-photon process are examined.
Original languageEnglish
Pages (from-to)235-238
Number of pages4
JournalChemical Physics Letters
Early online date4 Nov 2013
Publication statusPublished - 18 Dec 2013

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