Measurement of ¹²⁹Xe frequency shift due to Cs-¹²⁹Xe collisions

Enhancement factor κ₀, which characterizes NMR and EPR frequency shifts for Cs-¹²⁹Xe, is measured for the first time. The enhancement factor κ₀ was measured to be (702±41) at 80 ℃ and (653±20) at 90 ℃, using the NMR frequency shift, detected by atomic magnetometer at a low magnetic field of 100 nT. This result is useful for predicting the EPR frequency shifts for Cs and the NMR frequency shifts for ¹²⁹Xe in spin-exchange cells.