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Schmidt HT, Eklund G, Chartkunchand KC, et al. Rotationally Cold OH^{-} Ions in the Cryogenic Electrostatic Ion-Beam Storage Ring DESIREE. Phys Rev Lett. 2017;119(7):073001doi: 10.1103/PhysRevLett.119.073001.
Schmidt, H. T., Eklund, G., Chartkunchand, K. C., Anderson, E. K., Kamińska, M., de Ruette, N., Thomas, R. D., Kristiansson, M. K., Gatchell, M., Reinhed, P., Rosén, S., Simonsson, A., Källberg, A., Löfgren, P., Mannervik, S., Zettergren, H., & Cederquist, H. (2017). Rotationally Cold OH^{-} Ions in the Cryogenic Electrostatic Ion-Beam Storage Ring DESIREE. Physical review letters, 119(7), 073001. https://doi.org/10.1103/PhysRevLett.119.073001
Schmidt, H T, et al. "Rotationally Cold OH^{-} Ions in the Cryogenic Electrostatic Ion-Beam Storage Ring DESIREE." Physical review letters vol. 119,7 (2017): 073001. doi: https://doi.org/10.1103/PhysRevLett.119.073001
Schmidt HT, Eklund G, Chartkunchand KC, Anderson EK, Kamińska M, de Ruette N, Thomas RD, Kristiansson MK, Gatchell M, Reinhed P, Rosén S, Simonsson A, Källberg A, Löfgren P, Mannervik S, Zettergren H, Cederquist H. Rotationally Cold OH^{-} Ions in the Cryogenic Electrostatic Ion-Beam Storage Ring DESIREE. Phys Rev Lett. 2017 Aug 18;119(7):073001. doi: 10.1103/PhysRevLett.119.073001. Epub 2017 Aug 14. PMID: 28949695.
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Phys Rev Lett. 2017 Aug 18;119(7):073001. doi: 10.1103/PhysRevLett.119.073001. Epub 2017 Aug 14.

Rotationally Cold OH^{-} Ions in the Cryogenic Electrostatic Ion-Beam Storage Ring DESIREE.

Physical review letters

H T Schmidt, G Eklund, K C Chartkunchand, E K Anderson, M Kamińska, N de Ruette, R D Thomas, M K Kristiansson, M Gatchell, P Reinhed, S Rosén, A Simonsson, A Källberg, P Löfgren, S Mannervik, H Zettergren, H Cederquist

Affiliations

  1. Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden.
  2. Institute of Physics, Jan Kochanowski University, 25-369 Kielce, Poland.

PMID: 28949695 DOI: 10.1103/PhysRevLett.119.073001

Abstract

We apply near-threshold laser photodetachment to characterize the rotational quantum level distribution of OH^{-} ions stored in the cryogenic ion-beam storage ring DESIREE at Stockholm University. We find that the stored ions relax to a rotational temperature of 13.4±0.2  K with 94.9±0.3% of the ions in the rotational ground state. This is consistent with the storage ring temperature of 13.5±0.5  K as measured with eight silicon diodes but in contrast to all earlier studies in cryogenic traps and rings where the rotational temperatures were always much higher than those of the storage devices at their lowest temperatures. Furthermore, we actively modify the rotational distribution through selective photodetachment to produce an OH^{-} beam where 99.1±0.1% of approximately one million stored ions are in the J=0 rotational ground state. We measure the intrinsic lifetime of the J=1 rotational level to be 145±28  s.

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