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Title: Heat- and light-induced transformations of Yb trapping sites in an Ar matrix

The low-lying electronic states of Yb isolated in a solid Ar matrix grown at 4.2 K are characterized through absorption and emission spectroscopy. Yb atoms are found to occupy three distinct thermally stable trapping sites labeled “red,” “blue,” and “violet” according to the relative positions of the absorption features they produce. Classical simulations of the site structure and relative stability broadly reproduced the experimentally observed matrix-induced frequency shifts and thus identified the red, blue, and violet sites as due to respective single substitutional (SS), tetravacancy (TV), and hexavacancy (HV) occupation. Prolonged excitation of the {sup 1}S → {sup 1}P transition was found to transfer the Yb population from HV sites into TV and SS sites. The process showed reversibility in that annealing to 24 K predominantly transferred the TV population back into HV sites. Population kinetics were used to deduce the effective rate parameters for the site transformation processes. Experimental observations indicate that the blue and violet sites lie close in energy, whereas the red one is much less stable. Classical simulations identify the blue site as the most stable one.
Authors:
; ; ;  [1] ; ;  [2] ;  [3]
  1. Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, University of Science and Technology of China, Hefei 230026 (China)
  2. Department of Chemistry, M. V. Lomonosov Moscow State University, Moscow 119991 (Russian Federation)
  3. Skolkovo Institute of Science and Technology, 100 Novaya St., Skolkovo, Moscow Region 143025 (Russian Federation)
Publication Date:
OSTI Identifier:
22493195
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 143; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION; ANNEALING; ATOMS; EMISSION SPECTROSCOPY; EXCITATION; HEAT; KINETICS; SIMULATION; SOLIDS; STABILITY; TRANSFORMATIONS; YTTERBIUM