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Evidence for disorder in L-alanine lattice detected by Pulsed-EPR spectroscopy at cryogenic temperatures (CROSBI ID 125182)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Maltar-Strmečki, Nadica ; Rakvin, Boris Evidence for disorder in L-alanine lattice detected by Pulsed-EPR spectroscopy at cryogenic temperatures // Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 63 (2006), 4; 784-787-x

Podaci o odgovornosti

Maltar-Strmečki, Nadica ; Rakvin, Boris

engleski

Evidence for disorder in L-alanine lattice detected by Pulsed-EPR spectroscopy at cryogenic temperatures

The unusual behavior of lattice dynamics of l-alanine has been assigned to intermolecular dynamics and localization of vibrational energy. Recent heat capacity and Pulsed-EPR measurements support presence of thermally activated dynamic orientational disorder in the l-alanine lattice below 20 K. In the present study, the additional evidence for possible thermally activated disordered behavior of l-alanine lattice have been obtained by investigating dependences of longitudinal relaxation time of first stable l-alanine radical, SAR1, on sample cooling rates for the same low temperature interval. The obtained relaxation time by Pulsed-EPR shows clear dependence on cooling rates and this behavior can be explained within two types of suggested spin-lattice relaxation mechanisms for the paramagnetic centers in the hydrogen-bonded organic crystal.

L-alanine; pulsed-EPR; lattice disorder

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Podaci o izdanju

63 (4)

2006.

784-787-x

objavljeno

1386-1425

Povezanost rada

Fizika, Kemija

Indeksiranost