Radiative rotational lifetimes and state-resolved relative detachment cross sections from photodetachment thermometry of molecular anions in a cryogenic storage ring

2); (2) Institut f\"ur Physik; 3); (3) Weizmann Institute of Science; 4); (4) Institut f\"ur Atom- und Molek\"ulphysik; A. Becker (1); A. P. O'Connor (1); A. Wolf (1) ((1) Max-Planck-Institut f\"ur Kernphysik; C. Breitenfeldt (1

arxiv: 1707.04889 · v1 · pith:SGQ7MEA6new · submitted 2017-07-16 · ⚛️ physics.atom-ph · physics.acc-ph· physics.chem-ph

Radiative rotational lifetimes and state-resolved relative detachment cross sections from photodetachment thermometry of molecular anions in a cryogenic storage ring

C. Meyer (1) , A. Becker (1) , K. Blaum (1) , C. Breitenfeldt (1 , 2) , S. George (1) , J. G\"ock (1) , M. Grieser (1)

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F. Grussie (1) E. A. Guerin (1) R. von Hahn (1) P. Herwig (1) C. Krantz (1) H. Kreckel (1) J. Lion (1) S. Lohmann (1) P. M. Mishra (1) O. Novotn\'y (1) A. P. O'Connor (1) R. Repnow (1) S. Saurabh (1) D. Schwalm (1 3) L. Schweikhard (2) K. Spruck (1 4) S. Sunil Kumar (1) S. Vogel (1) A. Wolf (1) ((1) Max-Planck-Institut f\"ur Kernphysik D-69117 Heidelberg Germany (2) Institut f\"ur Physik Ernst-Moritz-Arndt-Universit\"at Greifswald D-17487 Greifswald (3) Weizmann Institute of Science Rehovot 76100 Israel (4) Institut f\"ur Atom- und Molek\"ulphysik Justus-Liebig-Universit\"at Gie{\ss}en D-35392 Gie{\ss}en Germany)

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classification ⚛️ physics.atom-ph physics.acc-phphysics.chem-ph

keywords photodetachmentrotationalstoragethermometrycrosscryogenicdependentmeasure

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Photodetachment thermometry on a beam of OH$^-$ in a cryogenic storage ring cooled to below 10 K is carried out using two-dimensional, frequency and time dependent photodetachment spectroscopy over 20 minutes of ion storage. In equilibrium with the low-level blackbody field, we find an effective radiative temperature near 15 K with about 90% of all ions in the rotational ground state. We measure the J = 1 natural lifetime (about 193 s) and determine the OH$^-$ rotational transition dipole moment with 1.5% uncertainty. We also measure rotationally dependent relative near-threshold photodetachment cross sections for photodetachment thermometry.

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Radiative rotational lifetimes and state-resolved relative detachment cross sections from photodetachment thermometry of molecular anions in a cryogenic storage ring

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