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(a) Quasi-optical Bridge with (1) isolator and two focusing parabolic mirrors, (2) microwave waveguide extending from top of (3) 4 mm Revolution NMR LLC. probe. (b) Bottom of probe head, (4) radio frequency transmission line, (5) Thomas Keating Ltd. Corrugated waveguide with miter bend, (6) stator, and (7) cooling helium gas inlet.
