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A Novel Method to Measure Electronic Spectra of Cold Molecular Ions

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University of Basel, CH-4056 Basel, Switzerland
University of Technology, 09107 Chemnitz, Germany
Cite this: J. Phys. Chem. Lett. 2013, 4, 23, 4051–4054
Publication Date (Web):November 7, 2013
https://doi.org/10.1021/jz402264n
Copyright © 2013 American Chemical Society

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    Abstract

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    A universal method has been developed for measuring spectra of molecular ions in a 22-pole radio frequency trap at 5 K. It is based on laser induced inhibition of complex growth (LIICG). The first successful measurements have been demonstrated on the A2ΠuX2Σg+ electronic transition with some thousand N2+ ions, helium densities of 1015 cm–3, and storage times of 1 s. The reduction of the number of N2+–He complexes is the result of an interplay between excitation, radiative and collisional cooling, ternary association, and collision induced dissociation, which is explained by a kinetic model.

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