Complex polarisabilities and hyperpolarisabilities of atoms

29th International Conference on Photonic, Electronic, and Atomic Collisions

Bromley, M.W.J.^1 ; Grunefeld, S.J.^1 ; Rossi, J.M.^2 ; Berengut, J.C.^3 ; Tang, L.Y.^4 ; Jiang, J.^5 ; Cheng, Yongjun^6 ; Mitroy, J.^7

School of Mathematics and Physics, University of Queensland, Australia^1

Computational Science Research Center, San Diego State University, United States^2

School of Physics, University of New South Wales, Australia^3

Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, China^4

Northwest Normal University, Langzhou, China^5

Harbin Institute of Technology, Harbin, China^6

School of Engineering, Charles Darwin University, Australia^7

关键词: Alkali atoms;    Eigenstates;    Non linear;    Photon-atom interaction;    Polarisabilities;    Polarisability;    Real part;    Unified method;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/9/092078/pdf
DOI  :  10.1088/1742-6596/635/9/092078

来源: IOP

【 摘 要 】

The complex dipole polarisabilities of alkali atoms are computed for low-lying eigenstates. We present a unified method of calculation of the real part of the polarisability as well as two different imaginary contributions to the polarisability. One imaginary polarisability is related to the resonant damping of the cross-section both below and above threshold, whilst the other imaginary polarisability describes the photoionisation cross-section above threshold. We also present preliminary calculations of the complex hyperpolarisabilities of atomic clocks and how they are impacted by the linear and non-linear photon-atom interactions.