Zhen-Xiang Zhong

Oscillator strengths between low-lying ro-vibrational states of hydrogen molecular ions

It is important for experimental design to know the transition oscillator strengths in hydrogen molecular ions. In this work, for HD(+), HT(+), and DT(+), we calculate the ro-vibrational energies and oscillator strengths of dipole transitions between two ro-vibrational states with the vibrational quantum number ν = 0-5 and the total angular momentum L = 0-5. The oscillator strengths of HT(+) and DT(+) are presented as supplementary material.

Spin-orbit corrections of order m alpha(6) to the fine structure of the (37,35) state in the He-4 p antiprotonic helium atom

Precise numerical calculation of radiofrequency intervals between hyperfine sublevels of the (37,35) state of the antiprotonic helium-4 atom is presented. Theoretical consideration includes the QED corrections of order m alpha(6) to the electron spin-orbit interaction. Only the leading order contribution in the electron-to-antiproton and electron-to-alpha particle mass ratios is considered, so the alpha particle and antiproton are treated nonrelativistically. The effective Hamiltonian is derived using the formalism of the nonrelativistic quantum electrodynamics.

Precision spectroscopy of the hydrogen molecular ion HD

Expectation values of the Breit operators and the Q terms are calculated for HD+ with the vibrational number v = 0-4 and the total angular momentum L = 0-4. Relativistic and radiative corrections to some rovibrational transition frequencies are determined. Numerical uncertainty in the R-infinity alpha(2) order correction is reduced to sub-kHz or smaller. Our work provides an independent verification of Korobovs calculations [V. I. Korobov, Phys. Rev. A 74, 052506 (2006); 77, 022509 (2008)]. DOI: 10.1103/PhysRevA.86.064502

Leading term of the He-(p)over-barHe(+) long-range interaction

The long-range interaction between an antiprotonic helium atom (p) over bar He+ and helium atom in its ground state is studied. We calculate the dispersion coefficients C-6 using the complex coordinate rotation (CCR) formalism in order to comply with the resonant nature of metastable states of the antiprotonic helium. We present as well numerical data on static dipole polarizabilities of antiprotonic helium states. The obtained coefficients C-6 may be used to estimate the collisional shift and broadening of transition lines in a low-density precision spectroscopy of the antiprotonic helium.

The leading term of the He

The long-range interaction between an antiprotonic helium atom (p) over bar He+ and helium atom in its ground state is studied. We calculate the dispersion coefficients C-6 using the complex coordinate rotation (CCR) formalism in order to comply with the resonant nature of metastable states of the antiprotonic helium. We present as well numerical data on static dipole polarizabilities of antiprotonic helium states. The obtained coefficients C-6 may be used to estimate the collisional shift and broadening of transition lines in a low-density precision spectroscopy of the antiprotonic helium.

-\bar{p}\mbox{He}^+

The long-range interaction between an antiprotonic helium atom (p) over bar He+ and helium atom in its ground state is studied. We calculate the dispersion coefficients C-6 using the complex coordinate rotation (CCR) formalism in order to comply with the resonant nature of metastable states of the antiprotonic helium. We present as well numerical data on static dipole polarizabilities of antiprotonic helium states. The obtained coefficients C-6 may be used to estimate the collisional shift and broadening of transition lines in a low-density precision spectroscopy of the antiprotonic helium.