A rapid field scan apparatus for use with ESR detection of transients produced by flash photolysis is described. Design data and test results are presented.
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For the Helmholtz configuration in free space see, e.g., W. T. Scott, Physics and Electricity of Magnetism (Wiley, New York, 1958), pp. 323–324. where B is the field in gauss, n and the number of turns per coil, I the current in amperes and a the radius of the coils in centimeters.
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This value of the field is greater than the calculated (free space) value because of the permeability of the pole faces to which the coils are mounted.
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A more rapid sweep could have been used except that distortion of the lines due to the 200 μsec time constant of the instrument would have occurred.
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The field at the shim is greater than at the center of the pole face; therefore, the field set with the field controller must be increased to in order to produce at the sample.
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© 1973 The American Institute of Physics.
1973
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