A procedure for fabricating novel TiO_(2) membrane materialwith sub-micrometre pores and large specific surface area from the template has been demonstrated. The morphology and structure of the membrane have been char...A procedure for fabricating novel TiO_(2) membrane materialwith sub-micrometre pores and large specific surface area from the template has been demonstrated. The morphology and structure of the membrane have been characterized by scanning electron microscopy. The results have indicated that the macroporous membraneconsists of uniform hollow spheres which are interconnected to each other by 'small windows'. Potential unique applications of this macroporous materialin the fields of catalysis, optics, sensors, etc, are suggested.展开更多
When focusing YAG laser pulses at 266nm into a heat-pipe oven containing PbI2 molecules vapor,four red line emissions at 626.0,619.8,613.7 and 621.8nm are observed.The photodissociation mechanism of PbI_(2) molecules ...When focusing YAG laser pulses at 266nm into a heat-pipe oven containing PbI2 molecules vapor,four red line emissions at 626.0,619.8,613.7 and 621.8nm are observed.The photodissociation mechanism of PbI_(2) molecules and the possible generation channels of these four line emissions are given.Moreover,the dependence of the emission at 626.0nm on incident laser energy and heat-pipe temperature is measured.The experimental observation is well supported by the photodissociation mechanism proposed by us.展开更多
The stimulated emission at 722.9nm is observed by a direct photodissociation of the PbI2 molecules with a 266nm pulse laser.The possible dissociation channels are discussed.Two-photon resonant photodissociation mechan...The stimulated emission at 722.9nm is observed by a direct photodissociation of the PbI2 molecules with a 266nm pulse laser.The possible dissociation channels are discussed.Two-photon resonant photodissociation mechanism is used to explain the generation of the 722.9 nm emission.The emission is measured at different incident laser energy and heat-pipe temperature.The obtained experimental result is well supported by the photodissociation mechanism given by us.展开更多
We have prepared a silica colloidal crystal with ethanol, which has a face-centered cubic structure and a corresponding photonic band gap located in the visible region, determined by Kossel ring analysis and the trans...We have prepared a silica colloidal crystal with ethanol, which has a face-centered cubic structure and a corresponding photonic band gap located in the visible region, determined by Kossel ring analysis and the transmission spectra. A special feature is an apparent variation of its lattice constant, as well as the gap frequency, with sample height. The Raman scattering induced by a picosecond laser at different heights of the colloidal crystal has been measured. It is found that the intensity of the Raman scattering is not related sensitively to the photonic gap, even though the Raman-Stokes wavelength is inside the gap.展开更多
基金Supported by the National Natural Science Foundation of China.
文摘A procedure for fabricating novel TiO_(2) membrane materialwith sub-micrometre pores and large specific surface area from the template has been demonstrated. The morphology and structure of the membrane have been characterized by scanning electron microscopy. The results have indicated that the macroporous membraneconsists of uniform hollow spheres which are interconnected to each other by 'small windows'. Potential unique applications of this macroporous materialin the fields of catalysis, optics, sensors, etc, are suggested.
基金Supported by the National Natural Science Foundation of China for Distinguished Young Scholars(19825110)National High Technology 410 Project.
文摘When focusing YAG laser pulses at 266nm into a heat-pipe oven containing PbI2 molecules vapor,four red line emissions at 626.0,619.8,613.7 and 621.8nm are observed.The photodissociation mechanism of PbI_(2) molecules and the possible generation channels of these four line emissions are given.Moreover,the dependence of the emission at 626.0nm on incident laser energy and heat-pipe temperature is measured.The experimental observation is well supported by the photodissociation mechanism proposed by us.
基金Supported by the National Natural Science Foundation of China for Distinguished Young Scholars(19825110)National High Technology 410 Project.
文摘The stimulated emission at 722.9nm is observed by a direct photodissociation of the PbI2 molecules with a 266nm pulse laser.The possible dissociation channels are discussed.Two-photon resonant photodissociation mechanism is used to explain the generation of the 722.9 nm emission.The emission is measured at different incident laser energy and heat-pipe temperature.The obtained experimental result is well supported by the photodissociation mechanism given by us.
基金Supported by the National Natural Science Foundation of China under Grant No.19774073.
文摘We have prepared a silica colloidal crystal with ethanol, which has a face-centered cubic structure and a corresponding photonic band gap located in the visible region, determined by Kossel ring analysis and the transmission spectra. A special feature is an apparent variation of its lattice constant, as well as the gap frequency, with sample height. The Raman scattering induced by a picosecond laser at different heights of the colloidal crystal has been measured. It is found that the intensity of the Raman scattering is not related sensitively to the photonic gap, even though the Raman-Stokes wavelength is inside the gap.
