A Novel Method to Measure Electronic Spectra of Cold Molecular Ions

Satrajit Chakrabarty, Mathias Holz, Ewen K. Campbell, Agniva Banerjee, Dieter Gerlich, John P. Maier

Research output: Contribution to journalArticlepeer-review


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 A2Πu←X2Σg+ electronic transition with some thousand N2+ ions, helium densities of 10 15 cm−3, and storage times of 1 s. The reduction of the number of N2+−He complexes isthe result of an interplay between excitation, radiative and collisional cooling, ternary association, and collision induced dissociation, which is explained by a kinetic model.
Original languageEnglish
Pages (from-to)4051-4054
JournalThe Journal of Physical Chemistry Letters
Issue number23
Early online date7 Nov 2013
Publication statusE-pub ahead of print - 7 Nov 2013


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