Spin-exchange relaxation of naturally abundant Rb in a K–Rb–<sup>21</sup>Ne self-compensated atomic comagnetometer

Spin-exchange relaxation of naturally abundant Rb in a K–Rb–²¹Ne self-compensated atomic comagnetometer

Lu Yan¹, Zhai Yueyang^{2, 3, 4}, Zhang Yong¹, Fan Wenfeng¹, Xing Li¹, Quan Wei^{2, 3, 4, †}

Theoretical results of SE broadening linewidths of magnetic resonance absorption lines. (a) Δν_total is the linewidth for using naturally abundant Rb, Δν′total is the linewidth for the assumption that the difference in the resonance frequencies between the two isotopes is zero, Δν_a is the linewidth for the assumption that the other isotope ⁸⁵Rb does not exist in naturally abundant Rb, Δν′a is the linewidth for using pure ⁸⁷Rb, and Δν′b is the linewidth for using pure ⁸⁵Rb. (b) Δνtotal−Δν′a is the extra broadening of naturally abundant Rb compared to the case of pure ⁸⁷Rb, Δνa−Δν′a is the extra broadening of naturally abundant Rb caused by the reduction in the effective Rb SE rate, and Δνtotal−Δν′total is the extra broadening of naturally abundant Rb caused by the difference in the resonance frequencies of the two isotopes.