Non-Born-Oppenheimer study of the muonic molecule ion 4Heμ+

doi:10.1088/1674-1056/ab7908

Abstract Accurate non-Born-Oppenheimer variational calculations of all bound states of the positive muon molecular ion ⁴Heμ⁺ have been performed using explicitly correlated Gaussian functions in conjunction with the global vectors. All the energies obtained are accurate in the order of 10^-6 Hartree (1 Hartree = 27.2114 eV). Compared with the binding energies obtained from calculations based on the Born-Oppenheimer potential with the mass-weighted adiabatic corrections (Chem. Phys. Lett. 110 487 (1984)), the largest relative deviation is up to 15%. By analyzing the average interparticle distances and possibility distributions of interparticle distances of this system, it is confirmed that the Born-Oppenheimer approximation is reasonable for this system and that ⁴Heμ⁺ can be regarded as a system of positive muon bound to a slightly distorted helium atom.

Keywords: positive muon variational calculation explicitly correlated Gaussian

Received: 02 January 2020
Revised: 05 February 2020
Accepted manuscript online:

PACS:	31.15.ac	(High-precision calculations for few-electron (or few-body) atomic systems)
	31.15.vn	(Electron correlation calculations for diatomic molecules)
	31.15.xt	(Variational techniques)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11704399), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030300), and the National Key Research and Development Program of China (Grant No. 2017YFA0304402).

Corresponding Authors: Meng-Shan Wu
E-mail: mswu@wipm.ac.cn

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Hang Yang(杨航), Meng-Shan Wu(吴孟山), Yi Zhang(张屹), Ting-Yun Shi(史庭云), Kalman Varga, Jun-Yi Zhang(张俊义) Non-Born-Oppenheimer study of the muonic molecule ion ⁴Heμ⁺ 2020 Chin. Phys. B 29 043102

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Non-Born-Oppenheimer study of the muonic molecule ion 4Heμ+

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Non-Born-Oppenheimer study of the muonic molecule ion ⁴Heμ⁺