Electron Spin Relaxation in Irradiated Solids [Spiral-bound]

Bernard T. Ghim (Author)

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Book Description

Publication Date: 1996

This is a AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A729803. The abstract provided by the Pentagon follows: This investigation has four separate sections related to analysis of irradiated materials using pulsed electron paramagnetic resonance (EPR) techniques. The first part documents the design and fabrication of versatile loop-gap resonators (LGR) made of copper-film (CuFlon (superscript R)) for use at various microwave frequencies. The LGRs are almost transparent to 100 KHz magnetic field modulation used in CW-EPR and allow 90% transmission of a 200 ns magnetic field pulse (2.5 mT) used in stepped field electron electron double resonance (STELDOR) experiments. The second part is a multifrequency investigation of the E' center of irradiated vitreous silica. The longitudinal relaxation time, T1, changed little between 1.1 and 9.1 GHz, but was systematically longer at 19.4 GHz. T1 was dependent upon orientation, with T1 values decreasing about 50% between the parallel and perpendicular orientations of the g-tensor with respect to the external magnetic field. The third part is a multifrequency CW and time domain EPR investigation of irradiated L-alanine which is used as a dosimeter for radiation. The time domain EPR analysis shows the presence of spectral diffusion. The fourth part is the development and use of ELDOR techniques to study the spectral diffusion in irradiated L-alanine and other irradiated organic solids. Pulsed STELDOR, and pulsed two-frequency ELDOR methods were developed and the details of the implementation is reported.

#outer_postBodyPS { display: none; } #psGradient { display: none; } #psPlaceHolder { display: none; } #psExpand { display: none; } This is a AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A729803. The abstract provided by the Pentagon follows: This investigation has four separate sections related to analysis of irradiated materials using pulsed electron paramagnetic resonance (EPR) techniques. The first part documents the design and fabrication of versatile loop-gap resonators (LGR) made of copper-film (CuFlon (superscript R)) for use at various microwave frequencies. The LGRs are almost transparent to 100 KHz magnetic field modulation used in CW-EPR and allow 90% transmission of a 200 ns magnetic field pulse (2.5 mT) used in stepped field electron electron double resonance (STELDOR) experiments. The second part is a multifrequency investigation of the E' center of irradiated vitreous silica. The longitudinal relaxation time, T1, changed little between 1.1 and 9.1 GHz, but was systematically longer at 19.4 GHz. T1 was dependent upon orientation, with T1 values decreasing about 50% between the parallel and perpendicular orientations of the g-tensor with respect to the external magnetic field. The third part is a multifrequency CW and time domain EPR investigation of irradiated L-alanine which is used as a dosimeter for radiation. The time domain EPR analysis shows the presence of spectral diffusion. The fourth part is the development and use of ELDOR techniques to study the spectral diffusion in irradiated L-alanine and other irradiated organic solids. Pulsed STELDOR, and pulsed two-frequency ELDOR methods were developed and the details of the implementation is reported.

Product Details

Spiral-bound: 178 pages
Publisher: Storming Media (1996)
Language: English
ISBN-10: 1423576454
ISBN-13: 978-1423576457

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