Extensive new data on the even-parity autoionization Rydberg series of neutral-tin have been observed and identified by using two-photon resonant ionization laser spectroscopy and time-of-flight detection method.Obser...Extensive new data on the even-parity autoionization Rydberg series of neutral-tin have been observed and identified by using two-photon resonant ionization laser spectroscopy and time-of-flight detection method.Observed autoionization Rydberg series are 5pnp(3/2,1/2)_(1,2),5pnp(3/2,3/2)_(1,2,3),5pnf3/2[5/2]_(2,3),5pnp3/2[7/2]_(3,4),and 5pnf3/2[3/2]_(1,2).The second ionization limit I2 is obtained by fitting experimental data with the Rydberg formula.It is 63483.90±1.35cm^(-1).展开更多
Non-resonant multiphoton ionization of atomic lead at 1064nm laser field has been studied.Both the angular distribution and the intensity dependence of photoelectrons have been measured.The results show that they are ...Non-resonant multiphoton ionization of atomic lead at 1064nm laser field has been studied.Both the angular distribution and the intensity dependence of photoelectrons have been measured.The results show that they are very sensitive to the process of multiphoton ionization.展开更多
Transmission of intense femtosecond laser pulses in air is accompanied by energy depletion.By measuring the transmitted spectra of the focused femtosecond pulses in air,we study the influence of air pressure and initi...Transmission of intense femtosecond laser pulses in air is accompanied by energy depletion.By measuring the transmitted spectra of the focused femtosecond pulses in air,we study the influence of air pressure and initial pulse energy on the spectra around the central wavelength(800 nm)after the interaction of the focused femtosecond laser with air.On this basis,the energy transmittance of the central wavelength of the femtosecond pulses is obtained.It is found that as the air pressure is lower than 1 kPa,the transmitted spectra of focused femtosecond pulses change with the pressure,but there is almost no energy depletion,while as the air pressure is higher than 1 kPa,femtosecond filamentation occurs and the energy transmittance of the central wavelength of the femtosecond pulses decreases with the increase of air pressure and pulse energy.According to the different regimes(i.e.,nonfilamentation,and filamentation regimes),we discuss the effect of energy conversion and transfer on the energy transmittance.This work can help to understand the energy depletion during the transmission of ultrashort intense laser pulses in air and provide a guidance for the practical applications of femtosecond filamentation.展开更多
We used multibody dissipative particle dynamics method,by which the attractive and repulsive interactions can be effectively considered,to investigate the evaporation-induced morphology patterns of triblock copolymer ...We used multibody dissipative particle dynamics method,by which the attractive and repulsive interactions can be effectively considered,to investigate the evaporation-induced morphology patterns of triblock copolymer A5B10C5 in thin film.With changing attractive interactions between solvent vapor and triblock copolymer that represent various selective solvents,lamellar morphology,sandwich lamellar morphology,spherical morphology and disorder morphology patterns of the thin films were obtained for both coil-coil-coil and rod-coil-coil chain architectures,respectively.The order parameter and the film thickness were calculated during the process for characterizing the film properties,and it was found that the rigid A-block of the triblock copolymer hinders the formation of an ordered structure.展开更多
基金Supported by Fok Ying Tong Education FoundationState Education Commission Special Fou ndation for Doctor Bases,P.R.China.
文摘Extensive new data on the even-parity autoionization Rydberg series of neutral-tin have been observed and identified by using two-photon resonant ionization laser spectroscopy and time-of-flight detection method.Observed autoionization Rydberg series are 5pnp(3/2,1/2)_(1,2),5pnp(3/2,3/2)_(1,2,3),5pnf3/2[5/2]_(2,3),5pnp3/2[7/2]_(3,4),and 5pnf3/2[3/2]_(1,2).The second ionization limit I2 is obtained by fitting experimental data with the Rydberg formula.It is 63483.90±1.35cm^(-1).
文摘Non-resonant multiphoton ionization of atomic lead at 1064nm laser field has been studied.Both the angular distribution and the intensity dependence of photoelectrons have been measured.The results show that they are very sensitive to the process of multiphoton ionization.
基金supported by the National Natural Science Foundation of China(Nos.11704145 and 11974138).
文摘Transmission of intense femtosecond laser pulses in air is accompanied by energy depletion.By measuring the transmitted spectra of the focused femtosecond pulses in air,we study the influence of air pressure and initial pulse energy on the spectra around the central wavelength(800 nm)after the interaction of the focused femtosecond laser with air.On this basis,the energy transmittance of the central wavelength of the femtosecond pulses is obtained.It is found that as the air pressure is lower than 1 kPa,the transmitted spectra of focused femtosecond pulses change with the pressure,but there is almost no energy depletion,while as the air pressure is higher than 1 kPa,femtosecond filamentation occurs and the energy transmittance of the central wavelength of the femtosecond pulses decreases with the increase of air pressure and pulse energy.According to the different regimes(i.e.,nonfilamentation,and filamentation regimes),we discuss the effect of energy conversion and transfer on the energy transmittance.This work can help to understand the energy depletion during the transmission of ultrashort intense laser pulses in air and provide a guidance for the practical applications of femtosecond filamentation.
基金Supported by the National Natural Science Foundation of China（Nos.21103064, 21173097, 21073075） and the Basic Re- search Fund of Jilin University, China（Nos.450060481158, 450060491249）.
文摘We used multibody dissipative particle dynamics method,by which the attractive and repulsive interactions can be effectively considered,to investigate the evaporation-induced morphology patterns of triblock copolymer A5B10C5 in thin film.With changing attractive interactions between solvent vapor and triblock copolymer that represent various selective solvents,lamellar morphology,sandwich lamellar morphology,spherical morphology and disorder morphology patterns of the thin films were obtained for both coil-coil-coil and rod-coil-coil chain architectures,respectively.The order parameter and the film thickness were calculated during the process for characterizing the film properties,and it was found that the rigid A-block of the triblock copolymer hinders the formation of an ordered structure.
