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\title{BOUND-BOUND AND BOUND-FREE SPECTROSCOPY OF COLD TRAPPED NEGATIVE IONS}

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\author{\underline{\FirstName R. \LastName WESTER}}
\address{Institut f{\"u}r Ionenphysik und Angewandte Physik, Universit{\"a}t Innbruck, 6020 Innsbruck, Austria}

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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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Cryogenic radiofrequency ion traps are a versatile tool to prepare molecular ions at cold translational as well as rovibrational temperatures \footnote{D. Gerlich, Phys. Scr. T59, 256 (1995)}$^,$\footnote{R. Wester, J. Phys. B 42, 154001 (2009)}. For negative ions, electron affinities and internal state populations can then be studied using photodetachment spectroscopy near threshold. We have used this approach to investigate rotational cooling of OH$^-$ anions \footnote{D. Hauser, S. Lee, F. Carelli, S. Spieler, O. Lakhmanskaya, E. S. Endres, S. S. Kumar, F. Gianturco, R. Wester, Nat. Phys. 11, 467 (2015)}\footnote{E. S. Endres, G. Egger, S. Lee, O. Lakhmanskaya, M. Simpson, R. Wester, J. Mol. Spectrosc. 332, 134 (2017)} and to determine the electron affinities of CN, C$_3$N, and C$_2$ with better accuracies \footnote{M. Simpson, M. N{\"o}tzold, A. Schmidt-May, T. Michaelsen, B. Bastian, J. Meyer, R. Wild, F. A. Gianturco, M. Milovanovic;, V. Kokoouline, R. Wester, J. Chem. Phys. 153, 184309 (2020)}$^,$\footnote{M. Simpson, M. N{\"o}tzold, T. Michaelsen, R. Wild, F. A. Gianturco, R. Wester, Phys. Rev. Lett. 127, 043001 (2021)}$^,$\footnote{S. Purushu et al., (in preparation)}. In the case of C$_3$N$^-$ this provided evidence for a dipole-bound state just below threshold, in good agreement with theoretical calculations. Furthermore, we have studied high-resolution bound-bound spectroscopy of a vibrational overtone in OH$^-$ \footnote{O. Lakhmanskaya, M. Simpson, R. Wester, Phys. Rev. A 102, 012809 (2020)} and an electronic transition in C$_2^-$ \footnote{M. N{\"o}tzold, R. Wild, C. Lochmann, R. Wester, Phys. Rev. A 106, 023111 (2022)}, which provided direct access to the translational velocity distributions of the ions. Recently, we have also observed the fluorescence from the excited B-state in C$_2^-$, mediated by vibrational quenching collisions \footnote{M. N{\"o}tzold et al., (in preparation)}.





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