简介:Westudytheoreticallyhowtoproduceanddetecttheultracoldground-stateCs2moleculefromFeshbachstate.Nu-mericalcalculationsareperformedbysolvingthequantumLiouvilleequationbasedonmultilevelBlochmodel.Theproducingefficiencyreaches55%andthedetectingefficiencyis31%.TheproducinganddetectingefficienciesarecloselyrelatedtotheRabifrequenciesoflaserpulses.Thedecayofrelevantelectronicandvibrationalstatesobviouslyreducestheproducinganddetectingefficiencies.
简介:Thehighharmonicgeneration(HHG)fromtheCS2moleculeinintenselaserfieldsisinvestigatedusingtheextendedLewensteinmethod.Tileinitialstateisthehighest-occupiedmolecularorbitaloftheCS2molecule,whichcanbewelldescribedbyGaussianwavepacketusingGAMESS-UKpackage.Comparedwiththecaseoftheellipticallaser,theHHGcanbeextendedintwo-colorcircularlypolarizedlaserfield.Thetime-frequencyanalysisandclassicalelectrontrajectoryaswellastheionizationyieldcurvearealsopresentedtofurtherexplaintheunderlyingmechanism.Afteraddingastaticelectricfieldonthez-direction,thesinglequantumpathcontrolisrealizedandthesupercontinuumspectraareobtained.Moreover,anisolated110aspulsecanbeobtainedbysuperposingtheharmonicsfrom130thto1SOthorder.
简介:134Csabranchingpointins-processpathwhichisshowninFig.1.Thebranchingratioisdefinedasfβ=λβ/(λβ+λn).Itcouldbededucedfromtheabundanceof134Baand136Basince136Bagoesthroughbothdecayandneutroncaptureof134Cswhile134Baonlyexperiencesdecaychannel[1].Duetoboth134Baand134Baarepures-processnuclei,thisbranchingpointisagoodapproachtodeterminethes-processparameters.Withtemperaturedependentβ-decayrateof134Cs,thetemperatureofs-processcouldbededuced.
简介:使用CASSCF/MRCI方法计算了CS+的势能曲线,为了获得更准确的势能曲线,必须对c和s原子采用大基组aug-cc—pCV5Z。测得CS+的振动能级和光谱参数,并与现有的实验值进行比较。这些结果充分支持以前观测的振动能级的结论。