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The influence of collision energy on magnetically tuned^(6)Li-^(6)Li Feshbach resonance

Chinese Physics B 2022年第6期31卷 326-333页

作者： Rong Zhang Yong-Chang Han Shu-Lin Cong Maksim B Shundalau Department of Physics Dalian University of TechnologyDalian 116024China DUT-BSU Joint Institute Dalian University of TechnologyDalian 116024China Physics Department Belarusian State UniversityMinskBelarus

The effect of collision energy on the magnetically tuned^(6)Li-^(6)Li Feshbach resonance(FR)is investigated theoretically by using the coupled-channel(CC)method for the collision energy ranging from 1μK·kBto 100μK·*** the collision energy of 1μK·kB,the resonance positions calculated are 543.152 Gs(s wave,the unit 1 Gs=10^(-4)T),185.109 Gs(p wave|ml|=0),and 185.113 Gs(p wave|ml|=1),*** p-wave FR near 185 Gs exibits a doublet structure of 4 mGs,associated with dipole-dipole *** the increase of the collision energy,it is found that the splitting width remains the same(4 mGs),and that the resonance positions of s and p waves are shifted to higher magnetic fields with the increase of collision *** variations of the other quantities including the resonance width and the amplitude of the total scattering section are also discussed in *** thermally averaged elastic rate coefficients at T=10,15,20,25 K are calculated and compared.

关键词： Feshbach resonance collision energy ^(6)Li-^(6)Li system

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Three-Body Recombination of Cold^(3)He–^(3)He–T^(-)System

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Chinese Physics Letters 2022年第8期39卷 28-33页

作者： Ming-Ming Zhao Li-Hang Li Bo-Wen Si Bin-Bin Wang Bina Fu Yong-Chang Han Department of Physics Dalian University of TechnologyDalian 116024China Beijing Institute of Radio Measurement Beijing 100854China Physics and Space Science College China West Normal UniversityNanchong 637009China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China DUT-BSU Joint Institute Dalian University of TechnologyDalian 116024China

The atom-atom-anion three-body recombination(TBR)and collision induced dissociation(CID)processes of the^(3)He-^(3)He-T^(-)system at ultracold temperatures are investigated by solving the Schr¨odinger equation in the adiabatic hyperspherical *** variations of the TBR and CID rates with the collision energies in the ultracold temperatures are *** is found that the J~Π=1~-symmetry dominates the TBR and CID processes in most of the considered collision energy *** rate of TBR(CID)into(from)the l=1 anion is larger than those for the l=0 and l=2 anions,with the l representing the rotational quantum number of~3HeT~-.This can be understood via the nonadiabatic couplings among the different channels.

关键词： collision anion symmetry

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Ab initio calculation of the ground and first excited states of the lithium dimer

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Communications in Theoretical Physics 2021年第12期73卷 129-136页

作者： JianJun Qi YuYao Bai QianQian Guo Yong-Chang Han Maksim B Shundalau Department of Physics Dalian University of TechnologyDalian 116024China DUT-BSU Joint Institute Dalian University of TechnologyDalian 116024China Physics Department Belarusian State UniversityMinskBelarus

Based on a high level ab initio calculation which is earned out with the multireference configuration interaction method under the aug-cc-pVXZ(AVXZ)basis sets,X=T,Q,5,the accurate potential energy curves(PECs)of the ground state X^(1)Σ_(g)^(+)and the first excited state A^(1)Σ_(u)^(+)of Li_(2)are *** fitting the ab initio potential energy points with the MurrellSorbie potential function,the analytic potential energy functions(APEFs)are *** molecular bond length at the equilibnum(R_(e)),the potential well depth(D_(e)),and the spectroscopic constants(B_(e),ω_(e),α_(e),andω_(e)χ_(e))for the X^(1)Σ_(g)^(+)state and the A^(1)Σ_(u)^(+)state are deduced from the *** vibrational energy levels of the two electronic states are obtained by solving the time-independent Schrodmger equation with the Founer gnd Hamiltonian *** the spectroscopic constants and the vibrational levels agree well with the experimental *** Franck-Condon factors(FCFs)corresponding to the transitions from the vibrational level(v’=0)of the ground state to the vibrational levels(v"=0-74)of the first excited state have been *** FCF for the vibronic transition of A^(1)Σ_(u)^(+)(v"=0)←X^(1)Σ_(g)^(+)(v’=0)is the *** PECs and corresponding spectroscopic constants provide reliable theoretical references to both the spectroscopic and the molecular dynamic studies of the Li_(2)dimer.

关键词： potential energy curve spectroscopic constants vibrational levels

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