A MINIMAL CAVITY AND ITS CAPACITIVE COUPLING FOR IN-VIVO EPR MEASUREMENTS ON MICE

A very simple ring resonator for in vivo L-band EPR spectroscopy was b uilt and characterised. It employs a special capacitive coupling that allows measurents to be made on large biological samples which are not possible with other resonators. In spite of its intrinsic low Q it ha s a sensitivity almost equivalent to that obtained from high Q resonat ors. These features were tested down to a nitroxide concentration of 1 0 mu M in high conductivity phantoms.