简介:Cesiumcontentintheseawateris3.0910-4mg·L-1,andammonium-typemordenitewasusedtoexchangecesiumfromcesiumsource.K-typemordenitewasobtainedbyhydrothermalsynthesismethod.Afterammonium-modified,ionexchangepropertiessuchassaturatedionexchangecapacitiesandselectivitycoefficientsforalkalimetalionsweredetermined.Atthesametime,ionexchangeisothermalcurvesofammonium-typemordeniteforCs+andNH4+weredeterminedat25°C.Pitzerelectrolytesolutiontheorywasusedtoworkoutactivitycoefficientsofthesystem,andtheKiellanddiagramoftheionexchangesystemwasobtained.Thecalculatedequilibriumconstant(Ka)andionfreeenthalpy(DG0)ofmordeniteforCs+andNH4+are1.455and-930.3J·mol-1,respectively,indicatingthationexchangeprocessofammonium-typemordeniteforcesiumisaspontaneousprocess.
简介:A459nmFaradayanomalousdispersionopticalfilter(FADOF)workingatthesidewingsofthecesium6S1∕2→7P1∕2transitionwithweakoscillatorstrengthisachieved.Thetransmittanceofthehighersidewingreaches98%atatemperatureof179°Candmagneticfieldabove323G.Theexperimentalresultscoincidewiththetheoreticalpredictionsin1982and1995,whichwerenotrealizedinexperimentsforoverthreedecades.Duetoitshightransmittance,highaccuracy,andnarrowlinewidth,the459nmFADOFcanbeappliedinunderwateropticalcommunications,thebuildingofactiveopticalclocks,andlaserfrequencystabilizationinactiveopticalclocks.