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简介：测量了K3C60单晶薄膜[111]方向的同步辐射角分辨光电子谱。首次观察到K3C60能带色散。通过对能带色散关系的分析，确立了K3C60低温下的一维无序取向结构。

简介：本文通过高分辨X射线衍射及掠入射(GID)的实验方法对生长在SrTiO3衬底上的LLa2/3Ca1/3MnO3和YBaCu3O7单层膜及YBa2Cu3O7-x/La2／3Ca1／3MnO3异质结构双层薄膜的微结构进行了研究。结果发现，所有薄膜都呈c向生长。由于热膨胀系数的不同而引起的热应力使得LCMO膜的晶格参数与靶材的相差较大。La2/3Ca1/3MnO3在单层腹及双层膜中都由靶材的立方结构变成了薄膜状态的四方结构。YBa2Cu3O7在单层膜及双层膜中都由靶材的正交结构变成了薄膜状态的四方结构。La2/3Ca1/3MnO3膜与YBa2Cu3O7膜在不同的样品中处于不同的应力状态。

简介：利用金刚石压砧高压装置（DAC），对Ca3Mn2O7的粉末样品进行了高压能散X射线衍射实验。结果表明，由于岩盐层易被压缩，在压力作用下层状钙钛矿结构锰氧化物Ca3Mn2O7的结构不稳定。在0－35GPa压力范围内，Ca3Mo2O7晶体结构发生了两次相变。在1．3GPa左右，由原来的四方相变为正交相，在9．5GPa左右，又由正交相向新的四方相转变。

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简介：Characteristicsofiontemperaturemeasuredwithcharge-exchangerecombinationspectroscopy（CXRS）werestudiedinOhmic,lower-hybrid-wave（LHW）drivenandion-cyclotron-resonance-frequency（ICRF）heatedplasmasinHT-7.TheresultsindicatethatthecentraliontemperatureTi0followstheone-thirdpowerlawintheproductofcentralline-averageddensityneandplasmacurrentIpinOhmicdischargesandisthereforeconsistentwiththeArtsimovichscalinglawTi0=K·（Ip·Bt·ne·R2）1/3.ItisshownthatthereisanappreciableincreaseofiontemperatureduringtheoperationwithbothLHWandICRFandthattheincrementofiontemperatureinthoseshotsismainlyduetotheenergytransferviacollisionsbetweenionsandelectronsratherthatbydirectheatingoftheions.

简介：SawtoothcontrolexperimentswereperformedonHT-7withalimiterconfigurationandontheExperimentalAdvancedSuperconductingTokamak(EAST)withadoublenullcon-figuration.Thesawtoothperiodcanbemodifiedbylowerhybridwave(LHW)andioncyclotronresonancefrequency(ICRF).Differentsawtoothbehaviorwasobservedwiththesameplasmadensity,LHWpowerbutdifferentplasmacurrentsonHT-7.TherewasadwelltimebetweenLHWaddedandthesawtoothstabilizationonHT-7whilethesawtoothstabilizationimmediatelyhappenedwhenLHWpowerwasinjectedonEAST.Thepossiblemechanismofthesawtoothcontrolisdiscussedinthispaper.Alltheexperimentalresultshaveprovedthatpowerdepositionoftheradiofrequency(RF)shouldbethekeyfactorforsawtoothcontrol.

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简介：对K3±δC60多晶薄膜进行了同步辐射光电子谱研究。入射光子能量为17－86cV。实验发现K3±δC60光电子谱的HOMO－1，HOMO及LUMO等导出能带的谱峰强度均随入射光子能量的增加而呈现振荡的性质，与纯C60的光电子谱峰随入射光子能量变化的趋势相似。结果C60分子独特的笼状几何结构，认为其电离截面的变化是由于K3±δC60的末态电子在C60分子笼内形成球状驻波引起的。以驻波的边界条件为基础进行理论计算，得到的电离截面极小值对应的光子能量与实验得到的结果符合良好。

简介：ThisworkinvestigatedC2F6/O2/ArplasmachemistryanditseffectontheetchingcharacteristicsofSiCOHlow-kdielectricsin60MHz/2MHzdual-frequencycapacitivelycoupleddischarge.FortheC2F6/Arplasma,theincreaseinthelow-frequency(LF)powerledtoanincreasedionimpact,promptingthedissociationofC2F6withhigherreactionenergy.Asaresult,fluorocarbonradicalswithahighF/Cratiodecreased.Theincreaseinthedischargepressureledtoadecreaseintheelectrontemperature,resultinginthedecreaseofC2F6dissociation.FortheC2F6/O2/Arplasma,theincreaseintheLFpowerpromptedthereactionbetweenO2andC2F6,resultingintheeliminationofCF3andCF2radicals,andtheproductionofanF-richplasmaenvironment.TheF-richplasmaimprovedtheetchingcharacteristicsofSiCOHlow-kfilms,leadingtoahighetchingrateandasmoothetchedsurface.

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简介：Experimentsonlowerhybridwave(LHW)couplingwereinvestigatedintheHT-7tokamak.GoodcouplingofLHWplasmahasbeendemonstratedatdifferentconditionsintheHT-7tokamak.RelevantresultshaveprovedthatLHW-plasmacouplingisaffectedbythephasedifferencebetweenadjacentwaveguides.Furthermore,theedgedensityaroundthegrillandrelevantcouplingcanbeadjustedbychangingtheplasmalineaveragedensityorthegapvaluebetweentheLHgrillandthelastclosedfluxsurfaces(LCFS).ItisfoundthatthecouplingofLHWsbecomespoorwhentheedgedensityaroundtheLHgrillislargeenoughintheHT-7tokamak,andthatcouplingremainsgoodwithaproperedgedensity.WithincreasingLHWpower,itisalsofoundthatthereflectioncoefficients(RCs)increaseduetonon-lineareffectsunderconditionsoflowedgerecycling,butcandecreaseunderhighedgerecycling.Theedgedensitydependsmainlyonthecompetitionbetweentheponderomotiveforce(PMF)andtheedgerecyclingintensityintheHT-7tokamak.

简介：SawtoothactivityonHT-7tokamakhasbeeninvestigatedexperimentallymainlybyusingsoftx-raydiodearrayandmagneticprobes.Theirbehaviorsandoccurrencesarecorrelatedcloselytothedischargeconditions:theelectrondensityNe,theelectrontemperatureTe,thesafetyfactorqaonplasmaboundaryandwallconditionetc.Whencentralline-averagedelectrondensityNe(0)isover2.0×1013cm-3,majorsawtoothactivityemergeswithaperiodofupto6.5msandafluctuationamplitudeofupto2～30%ofSXRradiationsignal.Insomecasessuchasthesafetyfactorbetween4.2～4.7andZeff=3.0～6.0,amonstersawtoothactivityoftenemergeswithoutapparentdeteriorationofplasmaconfinementandwithoutmajordisruption.Duringtheseevents,abundantMHDphenomenaareobservedincludingpartialsawtoothoscillations.Inthispaper,theobservedsawtoothbehaviorsandtheirdependenceontheandtheirdependencedensityNeandwallconditioninohmicallyheatedplasmaareintroduced,theresultsarediscussedandpresented.

简介：TheICRF(IonCyclotronRangeFrequency)cleaningtechniquehasbeenusedasaroutinewallcleaningmethodintheHT-7superconductingtokamak.Inawiderangeoftoroidalfield,thcremovalrateofresidualgasbyICRFcleaningwasabouttwentytimeshigherthanthatofglowdischargecleaning(GDC).AtdifferentgaspressureandRFpowerlevels,theICRFcleaningisstudiedcarcfully.Agoodimpurityclcaningeffectandaveryhighhydrogenremovalratewereobtained.Theremovalrateofhydrogenby5kWICRFcleaningachievedwas1.6×10-5Torr.1/s.AndtherelationshipsamongpressureP,outgassingrateQ,atomiclayersLabsorbedonsurfaceandthecleaningmodewerediscussedbriefly.

简介：Thispaperreportsforthefirsttimeanexperimentalstudyonthepowerdepositionprofileoftheioncyclotronrangefrequencies(ICRF)powerdepositingonelectronsinHT-7.ThefastFouriertransform(FFT)analysisandthebreakinslope(BIS)methodareutilizedtoobtaintheinformationofthepowerdeposition.Theresultsindicatethattheelectronswereheateddirectly,andtheelectronsabsorbedaround20%oftheinputpowerofthedischargeofinterest.

简介：测量了C60单晶[111]方向的同步辐射角分辨光电子谱。观察到HOMO能带和HOMO－1能带明显且有规律的色散。色散曲线与LDA理论结果符合得较好。

简介：测量了C60单晶（111）解理面法向发射的角分辨光电子谱。利用同步辐射光源研究了对应于分子轨道HOMO及HOMO－1的能带的色散关系。实验观察到HOMO和HOMO－1能带在Г－L方向存在明显的色散，最大色散分别为0.27eV和0.42eV色散曲线与理论电子结构基本符合。

简介：根据K在C60晶体中的扩散系数分析了在C60（111）单晶解理面上制备K3C60单晶膜的实验条件。对制备出的样品进行了角分辨光电子谱研究。结果表明样品确实为K3C60单晶，并首次观察到K3C60的能带色散。

简介：在C60单晶（111）解理面上制备出厚度约30mm的K3C60单晶膜。利用同步辐射光源，在低温下（约150K）测量了样品法向发射的角分辨光电子谱。观察到K3C60导带和价带明显的色散。导带的光电子谱峰可清晰分辨出4个子峰，这些子峰的最大色散超过0.5eV，并且色散曲线与K3C60的一维无序晶体结构模型下的能带理论基本吻合，只是子带间隔差异较大。

简介：在C60单晶(III)解理面上制各出Rb3C60单晶薄膜．得到了室温和150K温度时导带的光电子谱峰形，费米面附近的电子态密度随温度显著变化．甚至在室温时也能观察到导带有不少于6个子峰．