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The spin transverse relaxation time (${T_{2}}$) of atoms is an importantindicator in the field of precision measurement. Many methods have beenproposed to characterize the ${T_{2}}$ of atoms. In this paper, the ${T_{2}}$of rubidium (Rb) in the same cell is measured by four measuring methods, namelyspin noise spectrum signal fitting, improved free induction decay (FID) signalfitting, $\omega_m$-broadening fitting and magnetic resonance broadeningfitting. At the same time, the ${T_{2}}$ of five different types of Rb cellswere measured and characterized. A comparative analysis visualizes thecharacteristics of the different measuring methods and the effects of buffergas pressure filling on ${T_{2}}$ of Rb. By experimental observation, theapplicability of the different methods was analyzed, and we concluded that themethod of improved FID signal fitting gave the most accurate measurementbecause of the clean environment in which the measurements were taken. Thiswork can be used to provide another analytical perspective for the selection ofthe atomic vapor cells and may shed light on the improvement of the sensitivityof atomic magnetometers.

Comparison and analysis of methods for measuring the spin transverse relaxation time of rubidium atomic vapor