Abstract
Transient signals of optical nutations and free polarization decay arising in a gas 13CH3F (rotational transition R(4,3) of vibration mode 0–1 ν3 ) at the step-wise switch of electric field in the presence of resonant radiation of CO2 laser are investigated. In the limit of low intensity of radiation the peaks of free polarization decay are observed; the frequency of their appearance is proportional to the electric field strength. The number of observable peaks of free polarization decay decreases at laser intensity growth, and free polarization decay signal becomes indistinguishable at a background of optical nutations at high laser intensity. At high laser intensity the signal of transient optical nutations dominates. Results of calculations are in qualitative agreement with experimental data
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