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• W4385874689 abstract "High-resolution photoelectron energy spectra of osmium anions are obtained using the slow-electron velocity-map imaging method. The energy levels of excited states 4 F 7/2 , 4 F 5/2 and 4 F 3/2 of Os − are determined to be 148.730(13), 155.69(15), and 176.76(13) THz [or 4961.09(41), 5193.4(49), and 5896.1(42) cm −1 ], respectively. The lifetime of the opposite-parity excited state <?CDATA ${}^{6}{D}_{9/2}^{{rm{o}}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>6</mml:mn> </mml:msup> <mml:msubsup> <mml:mi>D</mml:mi> <mml:mrow> <mml:mn>9</mml:mn> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> <mml:mi mathvariant=normal>o</mml:mi> </mml:msubsup> </mml:mrow> </mml:math> is determined to be 201(10) μs using a cold ion trap, about 15 times shorter than the previous result 3(1) ms. Our high-level multi-configuration Dirac–Hartree–Fock calculations yield a theoretical lifetime 527 μs. Our work shows that the laser cooling rate of Os − is as fast as that of Th − . The advantages of Os − are its near-IR range cooling transition and simple electronic structure, which make Os − a promising candidate for laser cooling of negative ions. We propose a general approach to produce cold atoms and molecules based on the sympathetic cooling of negative ions in combination with a threshold photodetachment." @default.
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• W4385874689 date "2023-09-01" @default.
• W4385874689 modified "2023-10-04" @default.
• W4385874689 title "Energy Levels and Transition Rates for Laser Cooling Os⁻ and a General Approach to Produce Cold Atoms and Molecules" @default.
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• W4385874689 doi "https://doi.org/10.1088/0256-307x/40/9/093101" @default.
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