By using one-dimensional tight-binding model modified to include electron-electric field interaction and electron-electron interaction,we theoretically explore the polarization process of exciton and biexciton in cis-...By using one-dimensional tight-binding model modified to include electron-electric field interaction and electron-electron interaction,we theoretically explore the polarization process of exciton and biexciton in cis-polyacetylene.The dynamical simulation is performed by adopting the non-adiabatic evolution approach.The results show that under the effect of moderate electric field,when the strength of electron-electron interaction is weak,the singlet exciton is stable but its polarization presents obvious oscillation.With the enhancement of interaction,it is dissociated into polaron pairs,the spin-flip of which can be observed through modulating the interaction strength.For the triplet exciton,the strong electron-electron interaction restrains its normal polarization,but it is still stable.In the case of biexciton,the strong electron-electron interaction not only dissociate it,but also flip its charge distribution.The yield of the possible states formed after the dissociation of exciton and biexciton is also calculated.展开更多
以铝直接水解法获得的氢氧化铝粉末为原料,采用水热法制备薄水铝石粉体.利用X射线衍射、扫描电子显微镜、透射电子显微镜和热重-差示扫描量热仪等检测方法对粉体样品的物相结构、微观形貌及热分解过程进行表征.结果表明:水热产物均为斜...以铝直接水解法获得的氢氧化铝粉末为原料,采用水热法制备薄水铝石粉体.利用X射线衍射、扫描电子显微镜、透射电子显微镜和热重-差示扫描量热仪等检测方法对粉体样品的物相结构、微观形貌及热分解过程进行表征.结果表明:水热产物均为斜方相薄水铝石,粉体粒径在300 nm左右,经600℃煅烧后得到相似形貌的γ-Al_2O_3粉体.使用Popescu法对粉体的脱水动力学进行分析.经计算得,粉体脱水过程的机理函数为g(α)=(1-2α/3)-(1-α)^(2/3),属于D4模型,是三维扩散过程,该过程的活化能Ea=160.34 k J·mol^(-1),指前因子A=9.75×10~9 min^(-1),相关系数R_2=0.9916.展开更多
基金Project supported by the Natural Science Foundation of Shandong Province,China(Grant No.ZR2020MA070).
文摘By using one-dimensional tight-binding model modified to include electron-electric field interaction and electron-electron interaction,we theoretically explore the polarization process of exciton and biexciton in cis-polyacetylene.The dynamical simulation is performed by adopting the non-adiabatic evolution approach.The results show that under the effect of moderate electric field,when the strength of electron-electron interaction is weak,the singlet exciton is stable but its polarization presents obvious oscillation.With the enhancement of interaction,it is dissociated into polaron pairs,the spin-flip of which can be observed through modulating the interaction strength.For the triplet exciton,the strong electron-electron interaction restrains its normal polarization,but it is still stable.In the case of biexciton,the strong electron-electron interaction not only dissociate it,but also flip its charge distribution.The yield of the possible states formed after the dissociation of exciton and biexciton is also calculated.
文摘以铝直接水解法获得的氢氧化铝粉末为原料,采用水热法制备薄水铝石粉体.利用X射线衍射、扫描电子显微镜、透射电子显微镜和热重-差示扫描量热仪等检测方法对粉体样品的物相结构、微观形貌及热分解过程进行表征.结果表明:水热产物均为斜方相薄水铝石,粉体粒径在300 nm左右,经600℃煅烧后得到相似形貌的γ-Al_2O_3粉体.使用Popescu法对粉体的脱水动力学进行分析.经计算得,粉体脱水过程的机理函数为g(α)=(1-2α/3)-(1-α)^(2/3),属于D4模型,是三维扩散过程,该过程的活化能Ea=160.34 k J·mol^(-1),指前因子A=9.75×10~9 min^(-1),相关系数R_2=0.9916.
