Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
In the field of electron paramagnetic resonance spectrometry, ENDOR (Electron Nuclear Double Resonance) is a known method in which a sample is placed in a microwave cavity and is irradiated with both microwave and RF (radio frequency) energy to excite electrons and nuclei. The RF energy comes from an RF helix or coil, sometimes called an ENDOR coil. Shown in the drawing is an improved ENDOR coil 1 having a helix 2 connected to end supports 3. Each support 3 has an outer ring 4 connected to an inner ring 5 by connecting wires or bridges 6 spaced 180Œ apart. The resultant structure is relatively small in size so as to reduce the capacitance effect due to such supports. In other words, such construction diminishes input capacitance and allows an increased flow of current within the helix.