A multi-frequency EPR spectroscopy approach in the detection of boson peak excitations

被引：3

作者：

Kveder, Marina ^{[1
]}

Merunka, Dalibor ^{[1
]}

Ilakovac, Amon ^{[2
]}

Rakvin, Boris ^{[1
]}

机构：

[1] Rudjer Boskovic Inst, Zagreb 10000, Croatia

[2] Fac Sci, Zagreb 10000, Croatia

来源：

JOURNAL OF MAGNETIC RESONANCE | 2011年 / 213卷 / 01期

关键词：

Boson peak; Multi-frequency EPR; Electron spin-lattice relaxation; ELECTRON-SPIN RELAXATION; LATTICE-RELAXATION; SATURATION RECOVERY; DISORDER; MODES;

D O I：

10.1016/j.jmr.2011.08.029

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

The influence of boson peak (BP) excitations on low-temperature spin-lattice relaxation rate of a paramagnetic center embedded in a glassy matrix is investigated in the context of multi-frequency electron paramagnetic resonance (EPR) detection. In the theoretical analysis, the transition rate of spin one-half in the presence of a phonon field is calculated within the approximation of Fermi's golden rule. Several phonon densities of states are compared, among which one originating from a model of quasi-localized vibrations has been introduced into electron spin relaxation formalism for the first time. The respective frequency dependencies of spin-lattice relaxation rates are predicted which should lead to observable effects of BP modes if a multi-frequency study at very low temperatures is performed. (C) 2011 Elsevier Inc. All rights reserved.

引用

收藏

页码：26 / 31

页数：6

相关论文

共 38 条

[21] Far-infrared emission by boson peak vibrations in a globular protein [J].

Leyser, H ;

Doster, W ;

Diehl, M .

PHYSICAL REVIEW LETTERS, 1999, 82 (14) :2987-2990

[22] SPIN-LATTICE RELAXATION IN RARE-EARTH SALTS [J].

ORBACH, R .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1961, 264 (1318) :458-+

[23] Vibrational instability, two-level systems, and the boson peak in glasses [J].

Parshin, D. A. ;

Schober, H. R. ;

Gurevich, V. L. .

PHYSICAL REVIEW B, 2007, 76 (06)

[24] SOFT POTENTIAL MODEL AND UNIVERSAL PROPERTIES OF GLASSES [J].

PARSHIN, DA .

PHYSICA SCRIPTA, 1993, T49A :180-185

[25] Heat capacity and electron spin echo evidence for low frequency vibrational modes and lattice disorder in L-alanine at cryogenic temperatures [J].

Rakvin, B ;

Maltar-Strmecki, N ;

Ramsey, CM ;

Dalal, NS .

JOURNAL OF CHEMICAL PHYSICS, 2004, 120 (14) :6665-6673

[26] Quantitative assessment of the effects of orientational and positional disorder on glassy dynamics [J].

Ramos, MA ;

Vieira, S ;

Bermejo, FJ ;

Dawidowski, J ;

Fischer, HE ;

Schober, H ;

Gonzalez, MA ;

Loong, CK ;

Price, DL .

PHYSICAL REVIEW LETTERS, 1997, 78 (01) :82-85

[27] Boson peak and its relation to acoustic attenuation in glasses [J].

Ruffle, B. ;

Parshin, D. A. ;

Courtens, E. ;

Vacher, R. .

PHYSICAL REVIEW LETTERS, 2008, 100 (01)

[28] Communication: High-frequency acoustic excitations and boson peak in glasses: A study of their temperature dependence [J].

Ruta, B. ;

Baldi, G. ;

Giordano, V. M. ;

Orsingher, L. ;

Rols, S. ;

Scarponi, F. ;

Monaco, G. .

JOURNAL OF CHEMICAL PHYSICS, 2010, 133 (04)

[29] Development of high-pressure, high-field and multi-frequency ESR apparatus and its application to quantum spin system [J].

Sakurai, T. ;

Horie, T. ;

Tomoo, M. ;

Kondo, K. ;

Matsumi, N. ;

Okubo, S. ;

Ohta, H. ;

Uwatoko, Y. ;

Kudo, K. ;

Koike, Y. ;

Tanaka, H. .

INTERNATIONAL CONFERENCE ON HIGH PRESSURE SCIENCE AND TECHNOLOGY, JOINT AIRAPT-22 AND HPCJ-50, 2010, 215

[30] Impact of electron-electron spin interaction on electron spin relaxation of nitroxide diradicals and tetraradical in glassy solvents between 10 and 300 K [J].

Sato, Hideo ;

Kathirvelu, Velavan ;

Spagnol, Gaelle ;

Rajca, Suchada ;

Rajca, Andrzej ;

Eaton, Sandra S. ;

Eaton, Gareth R. .

JOURNAL OF PHYSICAL CHEMISTRY B, 2008, 112 (10) :2818-2828

← 1 2 3 4 →