简介：Accordingtothedipoletransitionselectionrulesandbychoosingpropertransitionchannels,itisfoundthattheinvertedY-typefour-levelschemecanbeclassifiedintoninedifferent2nd-ordersubschemeswhenusingcorrespondinglaserfields,andtheycanbefurtherclassifiedintoeighty3rd-ordersubschemesindetailaccordingtodifferentexcitingintensitiesthatareappliedindifferentchannels.Inthispaper,thestructuremultiformityofinvertedY-typefour-levelschemeisdiscussedandthedemonstrationsonsomesubschemesarealsogiven.Atthesametime,thesubschemeswhichhavebeenstudiedarepointedout,butmostofthemhavenotbeenresearchedtothebestofourknowledge.
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