• Open Access

Influence of a Supercritical Electric Dipole Moment on the Photodetachment of C3N

Malcolm Simpson, Markus Nötzold, Tim Michaelsen, Robert Wild, Franco A. Gianturco, and Roland Wester
Phys. Rev. Lett. 127, 043001 – Published 19 July 2021

Abstract

Threshold photodetachment spectroscopy of the molecular ion C3N has been performed at both 16(1) and 295(2) K in a 22-pole ion trap. The 295(2) K spectrum shows a large increase in the cross section with an onset about 200cm1 below threshold, which is explained by significant vibrational excitation of the trapped ions at room temperature. This excitation disappears at cryogenic temperatures leading to an almost steplike onset of the cross section at threshold, which cannot be adequately described with a Wigner threshold law. Instead, we show that the model developed by O’Malley for photodetachment from neutrals with large permanent dipoles [Phys. Rev. 137, A1668 (1965)] fits very well to the data. A high-resolution scan of the threshold region yields additional features, which we assign to the rotational P and R branches of an electronic transition to a dipole-bound state with Σ+1 symmetry. This state is found 2(1)cm1 below threshold in very good agreement with a recent computational prediction. We furthermore refine the value of the electron affinity of C3N to be 34727(1)cm1.

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  • Received 5 February 2021
  • Revised 28 April 2021
  • Accepted 26 May 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.043001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Malcolm Simpson, Markus Nötzold, Tim Michaelsen, Robert Wild, Franco A. Gianturco, and Roland Wester*

  • Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria

  • *roland.wester@uibk.ac.at

Article Text

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Issue

Vol. 127, Iss. 4 — 23 July 2021

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