A saturated-absorption spectrum of SiF4 gas, free of Doppler broadening, has been recorded in the lasing range of a low-pressure CO2 laser. Multiplets of superﬁne structure are observed, which are due to the tunnel transitions between the states of molecular rotation around equivalent symmetry axes. Multiplet satel- lites are revealed, whose origin is explained by two-photon processes. Splitting of the energy levels of the super- ﬁne structure multiplet is derived from satellite interpretation. A satellite is found, which can be caused by four- photon processes.
|Journal||Optics and Spectroscopy (English translation of Optika i Spektroskopiya)|
|State||Published - 2009|