Magnetic resonance investigation of F centers in LiF caused by ionizing radiation

T. Klempt; S. Schweizer; K. Schwartz; O. Kanert; D. Suter; U. Rogulis; J. M. Spaeth

doi:10.1080/10420150108214108

Magnetic resonance investigation of F centers in LiF caused by ionizing radiation

T. Klempt^*
, S. Schweizer
, K. Schwartz
, O. Kanert
, D. Suter
, U. Rogulis
, J. M. Spaeth

^*Corresponding author for this work

TU Dortmund University
Paderborn University
GSI Helmholtz Centre for Heavy Ion Research

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Damage caused in lithium fluoride crystals by γ-rays, electrons, and heavy ions includes, besides other point defects, F centers and their agglomerates. We have studied the paramagnetic F centers by measurements of the nuclear spin relaxation (NSR) of ¹⁹F and ⁷Li, the return of the magnetic circular dichroism of absorption (MCDA) after switching off the resonant microwave field and by optical absorption. The magnetic resonance experiments were performed over a range of defect concentrations to measure the longitudinal spin lattice relaxation times T_1e of the F centers. Over several orders of magnitude, the NSR rate T_1n^-1 is proportional to the concentration of F centers. Measurements at different frequencies and temperatures suggest a spin diffusion limited NSR process. Raising the temperature of the crystal initiates an annealing process that can be observed as a decrease of the NSR rate.

Original language	English
Pages (from-to)	159-163
Number of pages	5
Journal	Radiation Effects and Defects in Solids
Volume	155
Issue number	1-4
DOIs	https://doi.org/10.1080/10420150108214108
Publication status	Published - 2001
Externally published	Yes

Keywords

Annealing
F center
MCDA
Nuclear spin relaxation
Spin-diffusion limited

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10.1080/10420150108214108

Cite this

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title = "Magnetic resonance investigation of F centers in LiF caused by ionizing radiation",

abstract = "Damage caused in lithium fluoride crystals by γ-rays, electrons, and heavy ions includes, besides other point defects, F centers and their agglomerates. We have studied the paramagnetic F centers by measurements of the nuclear spin relaxation (NSR) of 19F and 7Li, the return of the magnetic circular dichroism of absorption (MCDA) after switching off the resonant microwave field and by optical absorption. The magnetic resonance experiments were performed over a range of defect concentrations to measure the longitudinal spin lattice relaxation times T1e of the F centers. Over several orders of magnitude, the NSR rate T1n-1 is proportional to the concentration of F centers. Measurements at different frequencies and temperatures suggest a spin diffusion limited NSR process. Raising the temperature of the crystal initiates an annealing process that can be observed as a decrease of the NSR rate.",

keywords = "Annealing, F center, MCDA, Nuclear spin relaxation, Spin-diffusion limited",

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doi = "10.1080/10420150108214108",

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}

TY - JOUR

T1 - Magnetic resonance investigation of F centers in LiF caused by ionizing radiation

AU - Klempt, T.

AU - Schweizer, S.

AU - Schwartz, K.

AU - Kanert, O.

AU - Suter, D.

AU - Rogulis, U.

AU - Spaeth, J. M.

PY - 2001

Y1 - 2001

N2 - Damage caused in lithium fluoride crystals by γ-rays, electrons, and heavy ions includes, besides other point defects, F centers and their agglomerates. We have studied the paramagnetic F centers by measurements of the nuclear spin relaxation (NSR) of 19F and 7Li, the return of the magnetic circular dichroism of absorption (MCDA) after switching off the resonant microwave field and by optical absorption. The magnetic resonance experiments were performed over a range of defect concentrations to measure the longitudinal spin lattice relaxation times T1e of the F centers. Over several orders of magnitude, the NSR rate T1n-1 is proportional to the concentration of F centers. Measurements at different frequencies and temperatures suggest a spin diffusion limited NSR process. Raising the temperature of the crystal initiates an annealing process that can be observed as a decrease of the NSR rate.

AB - Damage caused in lithium fluoride crystals by γ-rays, electrons, and heavy ions includes, besides other point defects, F centers and their agglomerates. We have studied the paramagnetic F centers by measurements of the nuclear spin relaxation (NSR) of 19F and 7Li, the return of the magnetic circular dichroism of absorption (MCDA) after switching off the resonant microwave field and by optical absorption. The magnetic resonance experiments were performed over a range of defect concentrations to measure the longitudinal spin lattice relaxation times T1e of the F centers. Over several orders of magnitude, the NSR rate T1n-1 is proportional to the concentration of F centers. Measurements at different frequencies and temperatures suggest a spin diffusion limited NSR process. Raising the temperature of the crystal initiates an annealing process that can be observed as a decrease of the NSR rate.

KW - Annealing

KW - F center

KW - MCDA

KW - Nuclear spin relaxation

KW - Spin-diffusion limited

UR - https://www.scopus.com/pages/publications/0012535929

U2 - 10.1080/10420150108214108

DO - 10.1080/10420150108214108

M3 - Article

AN - SCOPUS:0012535929

SN - 1042-0150

VL - 155

SP - 159

EP - 163

JO - Radiation Effects and Defects in Solids

JF - Radiation Effects and Defects in Solids

IS - 1-4

ER -

Magnetic resonance investigation of F centers in LiF caused by ionizing radiation

Abstract

Keywords

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