1Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210 2University of Chinese Academy of Sciences, Beijing 100049 3School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210 4Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Key Laboratory of the Ministry of Education, Tianjin University, Tianjin 300072 5Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088 6Hefei National Laboratory for Physical Sciences at the Microscale and Shanghai Branch, University of Science and Technology of China, Shanghai 201315 7CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315 8Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany
Abstract：Employing recently developed magneto-optical trap recoil ion momentum spectroscopy (MOTRIMS) combined with cold atoms, strong laser pulse, and ultrafast technologies, we study momentum distributions of the multiply ionized cold rubidium (Rb) induced by the elliptically polarized laser pulses (35 fs, $1.3\times 10^{15}$ W/cm$^{2}$). The complete vector momenta of Rb$^{n+}$ ions up to charge state $n = 4$ are recorded with extremely high resolution (0.12 a.u. for Rb$^{+}$). Variations of characteristic multi-bands are displayed in momentum distributions because the ellipticity varies from the linear to circular polarization, are interpreted qualitatively with the classical over-barrier ionization model. Present momentum spectroscopy of cold heavy alkali atoms presents novel strong-field phenomena beyond the noble gases.
Collins C B, Curry S M, Johnson B W, Mirza M Y, Chellehmalzadeh M A, Anderson J A, Popscu D and Popescu I 1976 Phys. Rev. A14 1662
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Li R Y, Yuan J Y, Wang X C, Hou X Y, Zhang S, Zhu Z Y, Ma Y X, Gao Q, Wang Z Y, Yan T M, Qin C C, Li S, Zhang Y Z, Weidermuller M and Jiang Y H 2019 J. Instrum.14 P02022
2020, Vol. 37 
