简介:ThefirstAsia-PacificComparisonofAbsoluteGravimeters(APMP.M.G-K1)wasorganizedbytheNationalInstituteofMetrology(NIM)ofChinafromDecember21,2015toMarch25,2016inChangping,Beijing.Ourcompactcoldatomgravimeter(CCAG)wastransportedfromHangzhoutoBeijingwithalongdistanceofabout1200kmtoparticipateinthiscomparison.TheCCAGistheonlyone,tothebestofourknowledge,thatisbasedontheprincipleofatominterferometryamongalltheinstruments.Absolutegravityintheindicatedthreetestsiteshasbeenmeasuredasrequestedbytheorganizer.ThesensitivityofourCCAGisestimatedtobe90μGal∕Hzp,evenwhenthemeasurementsarecarriedoutwithoutanyvibrationisolation.Besides,theaccuracyofthisgravimeterhasbeenevaluatedtobeabout19μGalbyconsideringthesignificantsystemerrors.Ourresultsshowagoodagreementwiththegivenreferencevalue.
简介:Wepresentageneralizedtwo-statetheorytoinvestigatethequantumdynamicsandstatisticsofanatomlaserwithnonlinearcouplings.TherotatingwaveapproximateHamiltonianofthesystemisprovedtobeanalyticallysolvable.Thefractionofoutputatomsisthenshowedtoexhibitaninterestingcollapseandrevivalphenomenonwithrespecttotheevolutiontime,asignofnonlinearcouplings.Severalnonclassicaleffects,suchassub-Poissoniandistribution,quadraturesqueezingeffects,second-ordercross-correlationandaccompaniedviolationofCauchy-Schwartzinequalityarealsorevealedfortheoutputmatterwave.Theinitialglobalphaseofthetrappedcondensate,inweaknonlinearcouplinglimits,isfoundtoexertaninterestingimpactonthequantumstatisticalpropertiesofthepropagatingatomlaserbeam.
简介:Onthebasisofthedressed-atommodel,thegeneralanalyticexpressionsfortheeigenenergies,eigenstatesandtheiropticalpotentialsoftheA-configurationthree-levelatomsystemarederivedandanalysed.Fromthecalculationofdipolematrixelementofdifferentdressedstates,weobtainthespontaneous-emissionratesinthedressed-atompicture.Wefindthatourgeneralexpressionsofopticalpotentialsforthethree-leveldressedatomcanbereducedtothesameasonesinpreviousreferencesundertheapproximationofasmallsaturationparameter.Wealsoanalysethedependencesoftheopticalpotentialsofathree-level^85Rbatomonthelaserdetuningandthedependencesofspontaneous-emissionratesontheradialpositioninthedarkhollowbeam,anddiscusstheprobability(population)evolutionsofdressed-atomiceigenstatesinthreelevelsinthehollowbeam.
简介:Theanisotropicpotentialdevelopedinourpreviousresearchandtheclose-couplingmethodareappliedtotheHBr-3He(4He,5He,6He,7He)system,andthepartialcrosssections(PCSs)attheincidentenergyof60meVarecalculated.Basedonthecalculations,theinfluencesoftheisotopeheliumatomonPCSsarediscussedindetail.TheresultsshowthattheexcitationPCSsconvergefasterthantheelasticPCSsforthecollisionenergyandthesystemsconsideredhere.AlsotheexcitationPCSsconvergemorerapidlyforthehigh-excitedstates.Thetaileffectispresentonlyinelasticscatteringandlow-excitedstatesbutnotinhigh-excitedstates.Withtheincreaseofreducedmassofthecollisionsystem,theconvergingspeedoftheelasticandexcitationPCSsslowsdown,andthetaileffectgoesup.
简介:Sr原子的运动过程在He-Sr的亚稳亚稳的转变激光纵的搏动的分泌物被分析,一个简明前後一致的物理模型被开发。分泌物参数,主要粒子密度,电子温度,和放射激光的脉搏的时间的进化是数字地计算的。模型提供的结果同意有实验的井,和每激光脉搏的时间的行为被模拟结果成功地解释。[从作者抽象]
简介:稳定的几何学,电子结构,和磁性(8,0)并且(4,4)做与的围单人赛的BNnanotubes(BNNT)稀土元素(RE)原子与密度用第一原则的pseudopotential飞机波浪方法被调查功能的理论(DFT)。结果证明这些RE原子能有效地与有利精力在BNNT被做。因为弯曲效果,为RE-atomdoped(4,4)BNNT的有约束力的精力的价值比一样的原子在上的那些大(8,0)BNNT。在RE-5d,6s,和B-2p之间的电子转移,N-2porbitals也被观察。而且,BNNT的电子结构和磁性能被如此的做修改。结果证明Ce,下午,Sm,和Eu原子的吸附能导致磁化,当当BNNT与La被做时,没有磁力被观察时。这些结果为spintronics应用程序并且为开发磁性的nanostructures是有用的。
简介:Weproposeanewmeasurementschemefortheatom-moleculedarkstatebyusingelectromagneticallyinducedtransparency(EIT)technique.Basedonadensity-matrixformalism,wecalculatetheabsorptioncoefficientnumerically.TheappearanceoftheEITdipinthespectraprofilegivesclearevidenceforthecreationofthedarkstateintheatom-moleculeBose-Einsteincondensate.
简介:Wepresenttheextendedhydrogenatomandmonopole-hydrogenatomtheorythroughgeneralizingtheusualhydrogenatommodelandwithamonopolemodelrespectively,inwhichY(sl(2))algebrasarerealized.WederivetheHamiltoniansofthetwomodelsbasedontheY(sl(2))andthegeneralizedPauliequation.TheenergyspectraofthesystemsarealsogivenintermsofYangianalgebraandquantummechanics.