The excited state characters of HY103 have been studied by means of time-resolved photon emission （time-correlated single photon counting） and time dependent density functional theory calculations. The experimental ...The excited state characters of HY103 have been studied by means of time-resolved photon emission （time-correlated single photon counting） and time dependent density functional theory calculations. The experimental and theoretical results demonstrate that HY103 dyes undergo an efficient one-bond-flip motion after photoexicitation at room temperature, which leads to a very short lifetime of the normM fluorescence state, and a weak fluorescence emission around 670 am. However, when HY103 are excited in amorphous glasses at 77 K, the normal fluorescence emission is prolonged to nanoseconds time scale about 2 ns, and the fluorescence emission is enhanced. Furthermore, a new emission state is produced, which is characterized as a volume-conserved twisted （VCT） state. This is the first observation of a VCT state. The experiment indicates that the VCT motion of excited state of π-conjugated molecules in restricted environment can form a stable emission state, and the excited state character of π-conjugated molecules in restricted environment is complex.展开更多
In this work,we aim to develop an effective fully discrete Spectral-Galerkin numerical scheme for the multi-vesicular phase-field model of lipid vesicles with adhesion potential.The essence of the scheme is to introdu...In this work,we aim to develop an effective fully discrete Spectral-Galerkin numerical scheme for the multi-vesicular phase-field model of lipid vesicles with adhesion potential.The essence of the scheme is to introduce several additional auxiliary variables and design some corresponding auxiliary ODEs to reformulate the system into an equivalent form so that the explicit discretization for the nonlinear terms can also achieve unconditional energy stability.Moreover,the scheme has a full decoupling structure and can avoid calculating variable-coefficient systems.The advantage of this scheme is its high efficiency and ease of implementation,that is,only by solving two independent linear biharmonic equations with constant coefficients for each phase-field variable,the scheme can achieve the second-order accuracy in time,spectral accuracy in space,and unconditional energy stability.We strictly prove that the fully discrete energy stability that the scheme holds and give a detailed step-by-step implementation process.Further,numerical experiments are carried out in 2D and 3D to verify the convergence rate,energy stability,and effectiveness of the developed algorithm.展开更多
文摘The excited state characters of HY103 have been studied by means of time-resolved photon emission （time-correlated single photon counting） and time dependent density functional theory calculations. The experimental and theoretical results demonstrate that HY103 dyes undergo an efficient one-bond-flip motion after photoexicitation at room temperature, which leads to a very short lifetime of the normM fluorescence state, and a weak fluorescence emission around 670 am. However, when HY103 are excited in amorphous glasses at 77 K, the normal fluorescence emission is prolonged to nanoseconds time scale about 2 ns, and the fluorescence emission is enhanced. Furthermore, a new emission state is produced, which is characterized as a volume-conserved twisted （VCT） state. This is the first observation of a VCT state. The experiment indicates that the VCT motion of excited state of π-conjugated molecules in restricted environment can form a stable emission state, and the excited state character of π-conjugated molecules in restricted environment is complex.
基金supported by National Natural Science Foundation of China(11771375)Shandong Provincial Natural Science Foundation(ZR2021ZD03,ZR2021MA010)supported by National Science Foundation with grant number DMS-2012490.
文摘In this work,we aim to develop an effective fully discrete Spectral-Galerkin numerical scheme for the multi-vesicular phase-field model of lipid vesicles with adhesion potential.The essence of the scheme is to introduce several additional auxiliary variables and design some corresponding auxiliary ODEs to reformulate the system into an equivalent form so that the explicit discretization for the nonlinear terms can also achieve unconditional energy stability.Moreover,the scheme has a full decoupling structure and can avoid calculating variable-coefficient systems.The advantage of this scheme is its high efficiency and ease of implementation,that is,only by solving two independent linear biharmonic equations with constant coefficients for each phase-field variable,the scheme can achieve the second-order accuracy in time,spectral accuracy in space,and unconditional energy stability.We strictly prove that the fully discrete energy stability that the scheme holds and give a detailed step-by-step implementation process.Further,numerical experiments are carried out in 2D and 3D to verify the convergence rate,energy stability,and effectiveness of the developed algorithm.
