Observation of electric-dipole transitions in the laser-cooling candidate Th- And its application for cooling antiprotons
(2021) In Physical Review A 103(4).- Abstract
Despite the fact that the laser-cooling method is a well-established technique to obtain ultracold neutral atoms and atomic cations, it has rarely if ever been applied to atomic anions due to the lack of suitable electric-dipole transitions. Efforts of more than a decade have until recently only resulted in La- as a promising anion candidate for laser cooling, but our previous work [Tang et al., Phys. Rev. Lett. 123, 203002 (2019)10.1103/PhysRevLett.123.203002] showed that Th- is also a potential candidate. Here we report on a combination of experimental and theoretical studies to determine the frequencies and rates, as well as branching ratios, for the relevant transitions in Th-. The resonant frequency of the laser-cooling transition... (More)
Despite the fact that the laser-cooling method is a well-established technique to obtain ultracold neutral atoms and atomic cations, it has rarely if ever been applied to atomic anions due to the lack of suitable electric-dipole transitions. Efforts of more than a decade have until recently only resulted in La- as a promising anion candidate for laser cooling, but our previous work [Tang et al., Phys. Rev. Lett. 123, 203002 (2019)10.1103/PhysRevLett.123.203002] showed that Th- is also a potential candidate. Here we report on a combination of experimental and theoretical studies to determine the frequencies and rates, as well as branching ratios, for the relevant transitions in Th-. The resonant frequency of the laser-cooling transition is determined to be ν=123.455(30) THz [λ=2428.4(6)nm]. The transition rate is calculated as A=1.17×104s-1. Since the branching fraction to dark states is negligible, 1.47×10-10, this represents an ideal closed cycle in Th- for laser cooling. Furthermore, the zero nuclear spin of Th232 makes the cooling process possible in a Penning trap, which can be used to confine both antiprotons and Th- ions. The presented ion dynamics simulations show that the laser-cooled Th- anions can effectively cool antiprotons to a temperature around 10 mK.
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- author
- Tang, Rulin ; Si, Ran ; Fei, Zejie ; Fu, Xiaoxi ; Lu, Yuzhu ; Brage, Tomas LU ; Liu, Hongtao ; Chen, Chongyang and Ning, Chuangang
- organization
- publishing date
- 2021-04-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review A
- volume
- 103
- issue
- 4
- article number
- 042817
- publisher
- American Physical Society
- external identifiers
-
- scopus:85105071989
- ISSN
- 2469-9926
- DOI
- 10.1103/PhysRevA.103.042817
- language
- English
- LU publication?
- yes
- id
- 4cfc0d18-dd93-465a-b3a8-1b04ba5f0f18
- date added to LUP
- 2021-05-27 16:13:20
- date last changed
- 2022-04-27 02:03:33
@article{4cfc0d18-dd93-465a-b3a8-1b04ba5f0f18,
abstract = {{<p>Despite the fact that the laser-cooling method is a well-established technique to obtain ultracold neutral atoms and atomic cations, it has rarely if ever been applied to atomic anions due to the lack of suitable electric-dipole transitions. Efforts of more than a decade have until recently only resulted in La- as a promising anion candidate for laser cooling, but our previous work [Tang et al., Phys. Rev. Lett. 123, 203002 (2019)10.1103/PhysRevLett.123.203002] showed that Th- is also a potential candidate. Here we report on a combination of experimental and theoretical studies to determine the frequencies and rates, as well as branching ratios, for the relevant transitions in Th-. The resonant frequency of the laser-cooling transition is determined to be ν=123.455(30) THz [λ=2428.4(6)nm]. The transition rate is calculated as A=1.17×104s-1. Since the branching fraction to dark states is negligible, 1.47×10-10, this represents an ideal closed cycle in Th- for laser cooling. Furthermore, the zero nuclear spin of Th232 makes the cooling process possible in a Penning trap, which can be used to confine both antiprotons and Th- ions. The presented ion dynamics simulations show that the laser-cooled Th- anions can effectively cool antiprotons to a temperature around 10 mK.</p>}},
author = {{Tang, Rulin and Si, Ran and Fei, Zejie and Fu, Xiaoxi and Lu, Yuzhu and Brage, Tomas and Liu, Hongtao and Chen, Chongyang and Ning, Chuangang}},
issn = {{2469-9926}},
language = {{eng}},
month = {{04}},
number = {{4}},
publisher = {{American Physical Society}},
series = {{Physical Review A}},
title = {{Observation of electric-dipole transitions in the laser-cooling candidate Th- And its application for cooling antiprotons}},
url = {{http://dx.doi.org/10.1103/PhysRevA.103.042817}},
doi = {{10.1103/PhysRevA.103.042817}},
volume = {{103}},
year = {{2021}},
}