Magnetic Resonance Absorption in the Chrome Alums

Measurements of paramagnetic resonance absorption at room temperature in single crystals of potassium chrome alum and ammonium chrome alum made at a frequency of 9375 mc/sec. are described. The method makes use of a magic-$T$ bridge with a low level crystal detector which essentially measures the magnetic susceptibility. Data are given for three orientations of the crystals for both the diluted and undiluted salts. The Stark splitting and the g factor of the ground state are evaluated from the positions of the absorption peaks. The theory which is used for the computation of the Stark splitting is extended to include the (110) orientation.