Ortho-Positronium Lifetime As a Detector of Spin-Crossover

M. Bokora, T. Mareka, K. Süvegha, Z.S. Böcskeib, J. Buschmannc and A. Vértesa a Department of Nuclear Chemistry, Eötvös Loránd University, P.O. Box 32, 1518 Budapest, Hungary b Chinoin Inc., Budapest, Hungary c Institute für Kristallographie, Freie Universität, Berlin, Germany

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Positron lifetime parameters were measured for the spin-crossover complexes [Fe(R-1H-tetrazole)6](BF4)2 (R = 1-ethyl, 1-n-propyl) and for the diamagnetic [Zn(1-n-propyl-1H-tetrazole)6](BF4)2. Positronium forms with significant intensity in the studied compounds. The ortho-para conversion of ortho-positronium was used to follow the spin-crossover. Changes of the dynamic structure were found in the propyltetrazole complex between 150 K and 90 K.

DOI: 10.12693/APhysPolA.95.469 PACS numbers: 78.70.Bj, 36.10.Dr, 75.20.-g, 33.25.+k