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Issue 2, 2013
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Internal state thermometry of cold trapped molecular anions

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Photodetachment spectroscopy of OH and H3O2 anions has been performed in a cryogenic 22-pole radiofrequency multipole trap. Measurements of the detachment cross section as a function of laser frequency near threshold have been analysed. Using this bound–free spectroscopy approach we could demonstrate rotational and vibrational cooling of the trapped anions by the buffer gas in the multipole trap. Below 50 K the OH rotational temperature shows deviations from the buffer gas temperature, and possible causes for this are discussed. For H3O2 vibrational cooling of the lowest vibrational quantum states into the vibrational ground state is observed. Its photodetachment cross section near threshold is modelled with a Franck–Condon model, with a detachment threshold that is lower, but still in agreement with the expected threshold for this system.

Graphical abstract: Internal state thermometry of cold trapped molecular anions

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Publication details

The article was received on 11 Sep 2012, accepted on 06 Nov 2012 and first published on 07 Nov 2012

Article type: Paper
DOI: 10.1039/C2CP43186F
Phys. Chem. Chem. Phys., 2013,15, 612-618

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    Internal state thermometry of cold trapped molecular anions

    R. Otto, A. von Zastrow, T. Best and R. Wester, Phys. Chem. Chem. Phys., 2013, 15, 612
    DOI: 10.1039/C2CP43186F

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