Sample cells for electron-resonance tests

Claim 1

A sample cell for the reception of highly polar liquid samples to be tested by electron precession resonance upon insertion into a microwave cavity resonator, comprising: a pair of elongated, identical parts of dielectric material each having a semicircular transverse cross section for substantially its entire length; each of said parts also having a rectangular recess milled in the flat, surface thereof, said recess extending longitudinally from one end of said parts and having a length less than the length of said parts; each of said parts further having a reduced, substantially rectangular transverse cross section along the predetermined portion of its length which is inserted into the microwave cavity resonator; said parts being mated symmetrically with their flat surfaces in adjoining relationship along their entire length to thereby form an internal sample cavity having a rectangular cross section, said cavity being open at said one end of said parts and closed at the other end of said parts; a pair of spaced rings each encircling an end portion of said mated parts for holding said parts in their adjoining relationship; whereby the circular portion of the cell centers it in the cavity resonator and the portion of the cell having a rectangular cross section forms reduced flat surfaces which are parallel to the adjoining flat surfaces of said parts, and sealing material between the adjoining surfaces of said mated parts to maintain samples within said sample cavity.