Geodesic
Signals of Free Polarization Decay in Gas $^{13}$CH$_3$F.
Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Kazanskii Gosudarstvennyi Universitet. Uchenye Zapiski. Seriya Fiziko-Matematichaskie Nauki, Tome 150 (2008) no. 2, pp. 166-172

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Signals of free polarization decay on a background of transient nutations generated by the method of levels Stark switching in $^{13}$CH$_3$F gas are investigated. Polarization of 9P(32) CO$_2$-laser radiation is parallel to a Stark field. Equidistant spectrum arises because of the linear Stark effect on 0–1 $\nu_3$ R(4,3) $^{13}$CH$_3$F transition, and the beats of free polarization decay signals corresponding to the transitions with different magnetic numbers ($M=-4,\dots,0,\dots,4$) are observed. These signals look like peaks with a period inversely proportional to the intensity of a Stark field. From this dependence the estimate is made for the weighed difference of $^{13}$CH$_3$F permanent dipole moments in the ground and vibrational excited states.
Keywords: free polarization decay, transient nutations, beating, Stark switching, coherent transients. 
@article{UZKU_2008_150_2_a22,
     author = {D. V. Ledovskikh and N. N. Rubtsova and E. B. Khvorostov},
     title = {Signals of {Free} {Polarization} {Decay} in {Gas} $^{13}${CH}$_3${F.}},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {166--172},
     publisher = {mathdoc},
     volume = {150},
     number = {2},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_2008_150_2_a22/}
}
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D. V. Ledovskikh; N. N. Rubtsova; E. B. Khvorostov. Signals of Free Polarization Decay in Gas $^{13}$CH$_3$F.. Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Kazanskii Gosudarstvennyi Universitet. Uchenye Zapiski. Seriya Fiziko-Matematichaskie Nauki, Tome 150 (2008) no. 2, pp. 166-172. http://geodesic.mathdoc.fr/item/UZKU_2008_150_2_a22/