The Ionization Potential (IP) is qualitatively de ned as the amount of energy to remove the most loosely bound electron of an isolated gaseous atom to form a cation, or the released energy of moving a single electron ...The Ionization Potential (IP) is qualitatively de ned as the amount of energy to remove the most loosely bound electron of an isolated gaseous atom to form a cation, or the released energy of moving a single electron from in nity to the surface of a cation. So the IP value is related to the electronic structure and is one of the fundamental parameters of the atom. We introduced a new experimental method to measure the Rydberg state energy levels of 87Rb atom and got its rst ionization potential to be 33 690.946(7) cm??1.展开更多
The Zeeman-hyperfine-rotational spectra of ^(40)K^(87)Rb within its vibronic ground state at a magnetic field of 545.9 G are investigated by adopting the latest molecular constants available,and the results are in goo...The Zeeman-hyperfine-rotational spectra of ^(40)K^(87)Rb within its vibronic ground state at a magnetic field of 545.9 G are investigated by adopting the latest molecular constants available,and the results are in good agreement with the experimental observation made by Ospelkaus et al.[Phys.Rev.Lett.104030402(2010)].However,the calculated spectra generally shift by−3.6 kHz from the experimental ones,which implies the inaccuracy of the effective rotational constant.Therefore,we refit the spectra and obtain a new B_(eff)=1113952(1)kHz,which reduces the overall root-mean-square deviation from 10.8 kHz to 7.9 kHz.Furthermore,the pure hyperfine spectra within the J=0 and 1 rotational states are simulated.We find that the scalar nuclear spin–spin interaction dominates the hyperfine splitting of J=0 despite it being slightly indirectly affected by the nuclear electric quadruple interaction due to the rotational perturbation,while the nuclear electric quadrupole interactions dominate the splitting,and the scalar and tensor nuclear spin–spin interactions also affect the splitting of J=1.The detailed hyperfine-rotational perturbations are studied.Therefore,the scalar and tensor nuclear spin–spin interaction constants can be precisely determined by simultaneously measuring the pure hyperfine radio-frequency spectra of the J=0 and 1 states in the vibronic ground state.展开更多
The physics package of a chip-scale atomic clock （CSAC） has been successfully realized by integrating vertical cavity surface emitting laser （VCSEL）, neutral density （ND） filter, λ/4 wave plate, 87Rb vapor cell...The physics package of a chip-scale atomic clock （CSAC） has been successfully realized by integrating vertical cavity surface emitting laser （VCSEL）, neutral density （ND） filter, λ/4 wave plate, 87Rb vapor cell, photodiode （PD）, and magnetic coil into a cuboid metal package with a volume of about 2.8 cm3. In this physics package, the critical component, 87Rb vapor cell, is batch-fabricated based on MEMS technology and in-situ chemical reaction method. Pt heater and thermistors are integrated in the physics package. A PTFE pillar is used to support the optical elements in the physics package, in order to reduce the power dissipation. The optical absorption spectrum of 87Rb D1 line and the microwave frequency correction signal are successfully observed while connecting the package with the servo circuit system. Using the above mentioned packaging solution, a CSAC with short-term frequency stability of about 7 × 10^-10τ-1/2 has been successfully achieved, which demonstrates that this physics package would become one promising solution for the CSAC.展开更多
We study the electromagnetically induced-absorption-like(EIA-like)effect for an n-type system in an^(87)Rb Bose–Einstein condensate(BEC)using the absorption imaging technique for coupling and driving lasers operating...We study the electromagnetically induced-absorption-like(EIA-like)effect for an n-type system in an^(87)Rb Bose–Einstein condensate(BEC)using the absorption imaging technique for coupling and driving lasers operating at the D_(1) and D_(2 )lines of^(87)Rb.The coherent effect is probed by measuring the number of atoms remaining after the BEC is exposed to strong driving fields and a weak probe field.The absorption imaging technique accurately reveals the EIA-like effect of the n-type system.This coherent effect in an n-type system is useful for optical storage,tunable optical switching,and so on.展开更多
Atomic density is a basic and important parameter in quantum optics, nonlinear optics, and precision measurement.In the past few decades, several methods have been used to measure atomic density, such as thermionic ef...Atomic density is a basic and important parameter in quantum optics, nonlinear optics, and precision measurement.In the past few decades, several methods have been used to measure atomic density, such as thermionic effect, optical absorption, and resonance fluorescence. The main error of these experiments stemmed from depopulation of the energy level, self-absorption, and the broad bandwidth of the laser. Here we demonstrate the atomic density of^87 Rb vapor in paraffin coated cell between 297 K and 334 K mainly using fluorescence measurement. Optical pumping, anti-relaxation coating, and absorption compensation approaches are used to decrease measurement error. These measurement methods are suitable for vapor temperature at dozens of degrees. The fitting function for the experimental data of87 Rb atomic density is given.展开更多
基金National Natural Science Foundation of China(11274316, 21203216, 11404346), "One Hundred Talents Program" of Chinese Academy of Sciences
文摘The Ionization Potential (IP) is qualitatively de ned as the amount of energy to remove the most loosely bound electron of an isolated gaseous atom to form a cation, or the released energy of moving a single electron from in nity to the surface of a cation. So the IP value is related to the electronic structure and is one of the fundamental parameters of the atom. We introduced a new experimental method to measure the Rydberg state energy levels of 87Rb atom and got its rst ionization potential to be 33 690.946(7) cm??1.
基金supported by the National Natural Science Foundation of China(Grant No.12004199).
文摘The Zeeman-hyperfine-rotational spectra of ^(40)K^(87)Rb within its vibronic ground state at a magnetic field of 545.9 G are investigated by adopting the latest molecular constants available,and the results are in good agreement with the experimental observation made by Ospelkaus et al.[Phys.Rev.Lett.104030402(2010)].However,the calculated spectra generally shift by−3.6 kHz from the experimental ones,which implies the inaccuracy of the effective rotational constant.Therefore,we refit the spectra and obtain a new B_(eff)=1113952(1)kHz,which reduces the overall root-mean-square deviation from 10.8 kHz to 7.9 kHz.Furthermore,the pure hyperfine spectra within the J=0 and 1 rotational states are simulated.We find that the scalar nuclear spin–spin interaction dominates the hyperfine splitting of J=0 despite it being slightly indirectly affected by the nuclear electric quadruple interaction due to the rotational perturbation,while the nuclear electric quadrupole interactions dominate the splitting,and the scalar and tensor nuclear spin–spin interactions also affect the splitting of J=1.The detailed hyperfine-rotational perturbations are studied.Therefore,the scalar and tensor nuclear spin–spin interaction constants can be precisely determined by simultaneously measuring the pure hyperfine radio-frequency spectra of the J=0 and 1 states in the vibronic ground state.
基金supported by the Knowledge Innovation Project of Chinese Academy of Sciences(Grant No.KGCX2-YW-143)
文摘The physics package of a chip-scale atomic clock （CSAC） has been successfully realized by integrating vertical cavity surface emitting laser （VCSEL）, neutral density （ND） filter, λ/4 wave plate, 87Rb vapor cell, photodiode （PD）, and magnetic coil into a cuboid metal package with a volume of about 2.8 cm3. In this physics package, the critical component, 87Rb vapor cell, is batch-fabricated based on MEMS technology and in-situ chemical reaction method. Pt heater and thermistors are integrated in the physics package. A PTFE pillar is used to support the optical elements in the physics package, in order to reduce the power dissipation. The optical absorption spectrum of 87Rb D1 line and the microwave frequency correction signal are successfully observed while connecting the package with the servo circuit system. Using the above mentioned packaging solution, a CSAC with short-term frequency stability of about 7 × 10^-10τ-1/2 has been successfully achieved, which demonstrates that this physics package would become one promising solution for the CSAC.
基金the National Key Research and Development Program of China under Grant No 2016YFA0301602the National Natural Science Foundation of China under Grant Nos 11474188 and 11704234the Fund for Shanxi‘1331 Project’Key Subjects Construction,and the Program of Youth Sanjin Scholar
文摘We study the electromagnetically induced-absorption-like(EIA-like)effect for an n-type system in an^(87)Rb Bose–Einstein condensate(BEC)using the absorption imaging technique for coupling and driving lasers operating at the D_(1) and D_(2 )lines of^(87)Rb.The coherent effect is probed by measuring the number of atoms remaining after the BEC is exposed to strong driving fields and a weak probe field.The absorption imaging technique accurately reveals the EIA-like effect of the n-type system.This coherent effect in an n-type system is useful for optical storage,tunable optical switching,and so on.
基金Project supported by the Natural Science Foundation of China(Grant Nos.11274118 and 11474095)the Innovation Program of Shanghai Municipal Education Commission of China(Grant No.13ZZ036)the Fundamental Research Funds for the Central Universities of China
文摘Atomic density is a basic and important parameter in quantum optics, nonlinear optics, and precision measurement.In the past few decades, several methods have been used to measure atomic density, such as thermionic effect, optical absorption, and resonance fluorescence. The main error of these experiments stemmed from depopulation of the energy level, self-absorption, and the broad bandwidth of the laser. Here we demonstrate the atomic density of^87 Rb vapor in paraffin coated cell between 297 K and 334 K mainly using fluorescence measurement. Optical pumping, anti-relaxation coating, and absorption compensation approaches are used to decrease measurement error. These measurement methods are suitable for vapor temperature at dozens of degrees. The fitting function for the experimental data of87 Rb atomic density is given.
