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Time-Resolved Measurements of the Adsorption/Desorption of Rb Atoms on Octadecyltrichlorosilane Coated Surfaces 被引量:1
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作者 廖康佳 王美玲 +1 位作者 张贵迎 赵凯锋 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第7期121-123,共3页
We carry out the first time-resolved measurement of Rb atoms desorbing from octadecyltrichlorosilane coated sur- faces by polarizing the atoms near the surface using an evanescent wave pump pulse and watching the subs... We carry out the first time-resolved measurement of Rb atoms desorbing from octadecyltrichlorosilane coated sur- faces by polarizing the atoms near the surface using an evanescent wave pump pulse and watching the subsequent intensity change of another evanescent wave probe beam, and find the mean adsorption (dwell) time to be about 400ns at a cell body temperature of 112℃. The adsorption energy is found to be 0.19eV from the surface tem- perature dependence of the adsorption time. This method can be extended to study the adsorption/desorption process of other alkali atoms on other surfaces of transparent substrates with an ultimate time resolution limited by the flight time of atoms in the evanescent wave which is of the order of nanoseconds. 展开更多
关键词 Time-Resolved Measurements of the Adsorption/Desorption of Rb Atoms on Octadecyltrichlorosilane Coated Surfaces RB OTS
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Pair Production in an Intense Laser Pulse: The Effect of Pulse Length 被引量:1
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作者 REN Na WANG Jia-Xiang +1 位作者 LI An-Kang WANG Ping-Xiao 《Chinese Physics Letters》 SCIE CAS CSCD 2012年第7期47-50,共4页
Production of positron-electron (e^(+) e^(-) ) pairs in an intense laser pulse is investigated by solving the Dirac equation with analytical and numerical methods.We observe that the probability of the pair production... Production of positron-electron (e^(+) e^(-) ) pairs in an intense laser pulse is investigated by solving the Dirac equation with analytical and numerical methods.We observe that the probability of the pair production will firstly decrease slowly as the pulse length T becomes shortened.Then it will increase until T is reduced to the Compton time Tc =(h)/(mec) ≈ 1.29 × 10^(-21)s and finally decrease exponentially to zero.Hence,for a prominent pair production,we not only require that the electric field strength should be higher than the Schwinger critical value Ecr =m^(2)c^(3)/(e(h)) ≈ 1.32 × 10^(16) V/cm,but also that the pulse duration T should be larger than Tc.The latter is shown to be related to momentum requirement for the transition.For fields with different pulse lengths,the phase and chirp influences upon the pair production are also explored. 展开更多
关键词 TRANSITION PULSE slowly
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Symmetry Potential and Effective Mass with Consistent Three-Body Force
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作者 LI Zeng-Hua ZUO Wei 《Chinese Physics Letters》 SCIE CAS CSCD 2012年第6期102-105,共4页
The momentum and isospin dependence of symmetry potential and effective mass in isospin asymmetric nuclear matter is investigated in the framework of the Brueckner-Hartree-Fock approach by adopting the realistic Bonn ... The momentum and isospin dependence of symmetry potential and effective mass in isospin asymmetric nuclear matter is investigated in the framework of the Brueckner-Hartree-Fock approach by adopting the realistic Bonn B two-body interaction in combination with a consistent microscopic three-body force.It is demonstrated that symmetry potentials at the normal density for different asymmetry parameters are in good agreement with the empirical value constrained by the experimental data,and the neutron and proton effective masses show strong isospin splitting with m*n > m*p on the whole range of asymmetry parameters.In the end,the density dependence of the Landau mass is displayed. 展开更多
关键词 FORCE SYMMETRY HARTREE
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