Long the sample cavity resonator structure for an epr spectrometer employing dielectric material for improving rf electric and magnetic field uniformity a

Claim 2

Apparatus for use in testing samples in an electron paramagnetic resonsance spectrometer system comprising a cavity resonator having an aperture therethrough to receive an elongated sample cell and to apply a radio frequency magnetic field to said sample cell along a substantial portion of its length to produce electron paramagnetic resonance therein, and a dielectric material positioned in the electric field near said sample cell aperture for controlling the relative intensity of the radio frequency magnetic field applied to a cell along the sample cell length wherein a greater thickness of dielectric material is present at regions of the sample cell length on opposite sides of the central region of the cell length than at the central region.

Claim 3

Apparatus as claimed in claim 1 wherein said cavity resonator operates in the rectangular TE102 mode.

Claim 4

Apparatus as claimed in claim 1 wherein said cavity resonator operates in the cylindrical TE011 mode.

Claim 5

Apparatus as claimed in claim 1 wherein said cavity resonator operates in the cylindrical TM110 mode.

Claim 6

Apparatus as claimed in claim 1 wherein said dielectric material has a concave shape with the thin section near the central region.

Claim 7

Apparatus As claimed in claim 5 wherein said dielectric material is a hollow cylindrical member surrounding the elongated sample cell and with a concave outer surface.

Claim 8

Apparatus as claimed in claim 1 wherein said dielectric material comprises at least two sections extending near the two end regions of the sample cell removed from the central region.

Claim 9

Apparatus as claimed in claim 7 wherein each of said sections comprises a hollow cylinder surrounding the sample cell.

Claim 10

Apparatus as claimed in claim 1 wherein said dielectric material at each side region comprises a pair of plates extending parallel to the sample cell and being positioned on opposite sides of the cell.

Claim 11

Apparatus as claimed in claim 9 wherein the inner ends of the plates near the central region of the sample cell are thicker than the remaining portion of the plates extending away from the central region.

Claim 12

A cavity resonator for an EPR spectrometer including, means for sustaining electric and magnetic field intensity waves in said resonator, said resonator including an aperture defining an axis therethrough for receiving an elongated sample cell, said magnetic field intensity being non-uniform along said sample cell axis, the improvement comprising: means for converting said non-uniform magnetic field intensity along said sample cell axis into a more nearly uniform magnetic field intensity along the said sample cell axis, said means comprising a dielectric material being interposed between said sample cell and at least a pair of cavity walls, said dielectric material includes a surface wherein the cross section of the surface through said axis includes elongated elements parallel to said axis.

Claim 13

A cavity resonator for an EPR spectrometer including, means for sustaining electric and magnetic field intensity waves in said resonator, said resonator including an aperture defining an axis therethrough for receiving an elongated sample cell, said magnetic field intensity being non-uniform along said sample cell axis, the improvement comprising: means for converting said non-uniform magnetic field intensity along said sample cell axis into a more nearly uniform magnetic field intensity along the said sample cell axis, said means comprising a dielectric material being interposed between said sample cell and at least a pair of cavity walls, said dielectric material includes a surface wherein the cross section of the surface through said axis includes elongated elements parallel to said axis.

Claim 14

A cavity resonator of claim 11 wherein said means comprising a dielectric material is configured with respect to the cavity so as to have less effect upon the cavity magnetic field at the region of maximum magnetic field than in the zones removed from the region of maximum magnetic field, said dielectric material being thinner at said region of maximum magnetic field.