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Abstract
Careful control of quantum states is a gateway to research in many areas of science such as quantum information, quantum-controlled chemistry, and astrophysical processes. Precise optical control of molecular ions remains a challenge due to the scarcity of suitable level schemes, and direct laser cooling has not yet been achieved for either positive or negative molecular ions. Using a cryogenic wire trap, we show how the internal quantum states of C2- anions can be manipulated using optical pumping and inelastic quenching collisions with H2 gas. We obtained optical pumping efficiencies of about 96% into the first vibrational level of C2- and determined the absolute inelastic rate coefficient from v=1 to 0 to be k_q = (3.2±0.2stat±1.3sys)×10−13 cm3/s at 20(3) K, over 3 orders of magnitude smaller than the capture limit. Reduced-dimensional quantum scattering calculations yield a small rate coefficient as well, but significantly larger than the experimental value. Using optical pumping and inelastic collisions, we also realized fluorescence imaging of negative molecular ions. Our work demonstrates high control of a cold ensemble of C2−, providing a solid foundation for future work on laser cooling of molecular ions.
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Authors (10)
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Markus Nötzold
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck
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Robert Wild
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck
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Christine Lochmann
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck
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Tanja Rahim
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck
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Sruthi Purushu Melath
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck
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Katrin Dulitz
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck
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Barry P. Mant
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck
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Francesco Antonio Gianturco
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck
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Roland Wester
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck
Cite as
Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/PhysRevLett.131.183002
- License
- Copyright (2023 American Physical Society)
Keywords
Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
PHYSICAL REVIEW LETTERS
no. 131,
ISSN: 0031-9007 - Language:
- English
- Publication year:
- 2023
- Bibliographic description:
- Nötzold M., Wild R., Lochmann C., Rahim T., Melath S. P., Dulitz K., Mant B. P., Franz J., Gianturco F. A., Wester R.: Vibrational Quenching of Optically Pumped Carbon Dimer Anions// PHYSICAL REVIEW LETTERS -Vol. 131,iss. 183002 (2023), s.1-5
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/physrevlett.131.183002
- Sources of funding:
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- Austrian Science Fund (FWF), Projects No. P29558-N36 and No. I3159-N36
- DECI resource BEM based in Poland at WCSS with support from the PRACE aisbl
- LEO HPC infrastructure of the University of Innsbruck
- Verified by:
- Gdańsk University of Technology
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