The mixed-field effect at the hyperfine level of the rovibronic ground state of the^(127)I^(79)Br(X^(1)Σ,v=0,J=0)molecule is computed on the J-I uncoupled basis of|JM_(J)I_(1)M_(1)I_(2)M_(2)>,where J is the molecu...The mixed-field effect at the hyperfine level of the rovibronic ground state of the^(127)I^(79)Br(X^(1)Σ,v=0,J=0)molecule is computed on the J-I uncoupled basis of|JM_(J)I_(1)M_(1)I_(2)M_(2)>,where J is the molecular total angular momentum excluding nuclear spin,M_J is the projection number of J,I_(1) and I_(2) are the nuclear spins of the iodine and bromine atoms,and M_(1) and M_(2) are the projection numbers of I_(1) and I_(2),respectively.When the two applied electric and magnetic fields are parallel,the perturbations are rare and only one perturbation is observed in a relatively large field regime in our computation range.However,when the two fields are off-parallel,the perturbations increase significantly and some sublevels show the Feshbach-like resonance phenomenon.Therefore,such sublevels transit between weak-field seeking and strong-field seeking repeatedly,which can be utilized to enhance or suppress cold molecular collision and chemical reaction rates.Such behavior of the molecular hyperfine structure in the mixed off-parallel fields may also be utilized to construct an electric-field-assisted anti-Helmholtz magnetic trap for cold molecules and to realize evaporative cooling of cold molecules(sub-mK)into the ultracold regime(μK).展开更多
A global analysis of the ro-vibrational spectra of 19 bands in the comet-tail （A2Πi-X2Σ＋） system of the 12C16O＋ cation is presented, and the precise molecular constants of the vibrational levels involved are obt...A global analysis of the ro-vibrational spectra of 19 bands in the comet-tail （A2Πi-X2Σ＋） system of the 12C16O＋ cation is presented, and the precise molecular constants of the vibrational levels involved are obtained via a weighted nonlinear least-squares fitting procedure. Furthermore, the resultant precise equilibrium molecular constants enable us to achieve accurate Rydberg-Klein-Rees （RKR） potential curves for both the A and X states, yielding the accurate Franck-Condon factor and band origin of each band in this system.展开更多
Taking into account the dephasing process in the realistic atomic ensemble,we theoretically study the generation of atomic spin squeezing via atomic coherence induced by the coupling and probe fields.Using the Heisenb...Taking into account the dephasing process in the realistic atomic ensemble,we theoretically study the generation of atomic spin squeezing via atomic coherence induced by the coupling and probe fields.Using the Heisenberg–Langevin approach,we find that the perfect spin squeezing in the X component can be obtained while the coupling and probe fields produce the maximum coherence between the ground state sublevels 1 and 2.Moreover,the degree of atomic spin squeezing in the X component can be strengthened with the increasing atomic density and/or Rabi frequency of the mixing field.The theoretical results provide a proof-of-principle demonstration of generating the atomic spin squeezing via quantum coherence in the realistic atomic ensemble which may find potential applications in quantum information processing and quantum networks.展开更多
The linear correlated constants AD （centrifugal correction of the spin-orbit coupling constant） and γ （the spinrotation constant） involved in the second negative （A^2 Ⅱu-X^2 Ⅱg） system of O2^＋ are determined...The linear correlated constants AD （centrifugal correction of the spin-orbit coupling constant） and γ （the spinrotation constant） involved in the second negative （A^2 Ⅱu-X^2 Ⅱg） system of O2^＋ are determined by nonlinear least-squares fitting the spectra of 16 O2^＋ and 18 0＋ using the isotopic effect. In addition, the molecular constants of the other O2^＋ isotopologues are predicted.展开更多
Adopting the experimentally available vibrational constants in a recent analysis of the strong perturbation between the A22Π3/2u and BΔ3/2u states of Cl+2in the A–X band system [Gharaibeh et al. 2012 J. Chem. Phys....Adopting the experimentally available vibrational constants in a recent analysis of the strong perturbation between the A22Π3/2u and BΔ3/2u states of Cl+2in the A–X band system [Gharaibeh et al. 2012 J. Chem. Phys. 137 194317], an unambiguous vibrational assignment of the bands reported previously is carried out. The equilibrium rotational constants Be and α e of the X2Π3/2g and A2Π3/2u states for35Cl+2and35Cl37Cl+and those of the B2Δ3/2u state for35Cl+2are obtained by fitting the experimental values of Bυ. In addition, the values of Be and α e of these three states for the minor isotopologues35Cl37Cl+and37Cl+2are predicted by employing the isotopic effect. The values of equilibrium internuclear distance Re of the three states for the three isotopologues are calculated as well.展开更多
Hyperfine structures and the field effects of IBr molecule in its rovibronic ground state are theoretically studied by diagonalizing the effective Hamiltonian matrix.Perturbations of high-J levels up to 4 are taken in...Hyperfine structures and the field effects of IBr molecule in its rovibronic ground state are theoretically studied by diagonalizing the effective Hamiltonian matrix.Perturbations of high-J levels up to 4 are taken into account when studying the hyperfine sub-levels of the J=0 level,and thus,an 80×80 matrix is constructed and solved.Some of the experimentally absent molecular constants are computed using Dalton program.Our results will be helpful in the experimental investigation of manipulation and further cooling of cold IBr molecules.展开更多
Hyperfine structures of IC1 in its vibronic ground state due to the nuclear spin and electric quadruple interactions are determined by diagonalizing the effective Hamiltonian matrix. Furthermore, the Stark sub-levels ...Hyperfine structures of IC1 in its vibronic ground state due to the nuclear spin and electric quadruple interactions are determined by diagonalizing the effective Hamiltonian matrix. Furthermore, the Stark sub-levels are precisely determined as well. The results are helpful for electro-static manipulation （trapping or further cooling） of cold IC1 molecules. For example, an electric field of 1000 V/cm can trap IC1 molecules less than 637μK in the lowest hyperfine level.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No.12004199)。
文摘The mixed-field effect at the hyperfine level of the rovibronic ground state of the^(127)I^(79)Br(X^(1)Σ,v=0,J=0)molecule is computed on the J-I uncoupled basis of|JM_(J)I_(1)M_(1)I_(2)M_(2)>,where J is the molecular total angular momentum excluding nuclear spin,M_J is the projection number of J,I_(1) and I_(2) are the nuclear spins of the iodine and bromine atoms,and M_(1) and M_(2) are the projection numbers of I_(1) and I_(2),respectively.When the two applied electric and magnetic fields are parallel,the perturbations are rare and only one perturbation is observed in a relatively large field regime in our computation range.However,when the two fields are off-parallel,the perturbations increase significantly and some sublevels show the Feshbach-like resonance phenomenon.Therefore,such sublevels transit between weak-field seeking and strong-field seeking repeatedly,which can be utilized to enhance or suppress cold molecular collision and chemical reaction rates.Such behavior of the molecular hyperfine structure in the mixed off-parallel fields may also be utilized to construct an electric-field-assisted anti-Helmholtz magnetic trap for cold molecules and to realize evaporative cooling of cold molecules(sub-mK)into the ultracold regime(μK).
基金the National Natural Science Foundation of China(Grant No.11034002)the State Key Development Program for Basic Research of China(Grant No.2011CB921602)+2 种基金the Natural Science Program of Nantong University,Chinathe State Key Laboratory of Precision Spectroscopy,ChinaQing Lan Project,China
文摘A global analysis of the ro-vibrational spectra of 19 bands in the comet-tail （A2Πi-X2Σ＋） system of the 12C16O＋ cation is presented, and the precise molecular constants of the vibrational levels involved are obtained via a weighted nonlinear least-squares fitting procedure. Furthermore, the resultant precise equilibrium molecular constants enable us to achieve accurate Rydberg-Klein-Rees （RKR） potential curves for both the A and X states, yielding the accurate Franck-Condon factor and band origin of each band in this system.
文摘Taking into account the dephasing process in the realistic atomic ensemble,we theoretically study the generation of atomic spin squeezing via atomic coherence induced by the coupling and probe fields.Using the Heisenberg–Langevin approach,we find that the perfect spin squeezing in the X component can be obtained while the coupling and probe fields produce the maximum coherence between the ground state sublevels 1 and 2.Moreover,the degree of atomic spin squeezing in the X component can be strengthened with the increasing atomic density and/or Rabi frequency of the mixing field.The theoretical results provide a proof-of-principle demonstration of generating the atomic spin squeezing via quantum coherence in the realistic atomic ensemble which may find potential applications in quantum information processing and quantum networks.
基金Supported by the National Natural Science Foundation of China under Grant No 11034002, the National Basic Research Program of China under Grant No 2011CB921602, the QingLan Project of Jiangsu Province, and the Natural Science Foundation of Zhejiang Province under Grant No Y6110524.
文摘The linear correlated constants AD （centrifugal correction of the spin-orbit coupling constant） and γ （the spinrotation constant） involved in the second negative （A^2 Ⅱu-X^2 Ⅱg） system of O2^＋ are determined by nonlinear least-squares fitting the spectra of 16 O2^＋ and 18 0＋ using the isotopic effect. In addition, the molecular constants of the other O2^＋ isotopologues are predicted.
基金supported by the Natural Science Foundation of Zhejiang Province,China(Grant Nos.Y6110524 and Y1111085)the Scientific Research Foundation of the Department of Education of Zhejiang Province,China(Grant No.Y201430970)+1 种基金the National Nature Science Foundation of China(Grant No.11247007)the Qing Lan Project of Jiangsu Province,China
文摘Adopting the experimentally available vibrational constants in a recent analysis of the strong perturbation between the A22Π3/2u and BΔ3/2u states of Cl+2in the A–X band system [Gharaibeh et al. 2012 J. Chem. Phys. 137 194317], an unambiguous vibrational assignment of the bands reported previously is carried out. The equilibrium rotational constants Be and α e of the X2Π3/2g and A2Π3/2u states for35Cl+2and35Cl37Cl+and those of the B2Δ3/2u state for35Cl+2are obtained by fitting the experimental values of Bυ. In addition, the values of Be and α e of these three states for the minor isotopologues35Cl37Cl+and37Cl+2are predicted by employing the isotopic effect. The values of equilibrium internuclear distance Re of the three states for the three isotopologues are calculated as well.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12004199,U1810129,52076145,and 11904252).
文摘Hyperfine structures and the field effects of IBr molecule in its rovibronic ground state are theoretically studied by diagonalizing the effective Hamiltonian matrix.Perturbations of high-J levels up to 4 are taken into account when studying the hyperfine sub-levels of the J=0 level,and thus,an 80×80 matrix is constructed and solved.Some of the experimentally absent molecular constants are computed using Dalton program.Our results will be helpful in the experimental investigation of manipulation and further cooling of cold IBr molecules.
基金supported by the National Natural Science Foundation of China(Grant No.11034002)the National Basic Research Program of China(Grant No.2011CB921602)Qing Lan Project,China
文摘Hyperfine structures of IC1 in its vibronic ground state due to the nuclear spin and electric quadruple interactions are determined by diagonalizing the effective Hamiltonian matrix. Furthermore, the Stark sub-levels are precisely determined as well. The results are helpful for electro-static manipulation （trapping or further cooling） of cold IC1 molecules. For example, an electric field of 1000 V/cm can trap IC1 molecules less than 637μK in the lowest hyperfine level.
