University of Khartoum

Electron Spin Resonance Spectrometer Interfacing

Electron Spin Resonance Spectrometer Interfacing

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Title: Electron Spin Resonance Spectrometer Interfacing
Author: Abd El Moneim El Obeid, Hussein
Abstract: The ESR spectrometer is a collection of more than eight equipments connected together to perform magnetic field sweep of a sample and monitoring the Electron Spin Resonance signal which is a stimulated magnetic dipole transition between two quantum states explained by Zeeman effect. The controlling unit of the spectrometer is the chart recorder which is also responsible of plotting the magnetic field sweep versus the response signal using servo motors. This work deals with the interfacing of the Electron Spin Resonance ESR spectrometer with the computer. That means the control of the system is carried by the computer and the ESR response is acquired by the computer too. In other words one can say the chart recorder function is carried out by the computer. The main benefit of this work is the plot of the first derivative of the ESR response signal (microwave absorption) as Y-axis versus the magnetic field as X-axis and printing out the plot. By this the peak of the absorption curve can be determined which corresponds to zero crossing point of the first derivative plot. Two cards are used to accomplish this work, a Universal Interface Board (UIB) which is installed in the computer used as a parallel output port and an other home made card (Additional Circuit) which is installed in the magnetic field stabilizer of the spectrometer used to couple the computer with the spectrometer. A program is also developed using Labwindows software which is a development system for Quick Basic and C language programmers to perform the control and acquisition. The results (absorption peak) obtained are quite good compared with the one obtained by the chart recorder. And the sensitivity of the Y-axis signal is 5mV while the sensitivity of the X-axis signal equals the sweep range (which is selectable) divided by 4096. Also it should be noted that the interface hardware made is fully compatible in both directions and there are no limitation problems.
URI: http://khartoumspace.uofk.edu/handle/123456789/15894
Date: 2015-07-02


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