Radiative Rotational Lifetimes and State-Resolved Relative Detachment Cross Sections from Photodetachment Thermometry of Molecular Anions in a Cryogenic Storage Ring.
- Meyer, C.
- Becker, A.
- Blaum, K.
- Breitenfeldt, C.
- George, S.
- Göck, J.
- Grieser, M.
- Grussie, F.
- Guerin, E.
- von Hahn, R.
- Herwig, P.
- Krantz, C.
- Kreckel, H.
- Lion, J.
- Lohmann, S.
- Mishra, P.
- Novotny, O.
- O'Connor, A.
- Repnow, R.
- Saurabh, S.
- Schwalm, D.
- Schweikhard, L.
- Spruck, K.
- Kumar, S.
- Vogel, S.
- Wolf, A.
DOIAbstract
Photodetachment thermometry on a beam of OH<sup>−</sup> in a cryogenic storage ring cooled to below 10 K is carried out using two-dimensional frequency- and time-dependent photodetachment spectroscopy over 20 min 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<sup>−</sup> 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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