Double Resonance Rotational Spectroscopy of Weakly Bound Ionic Complexes: The Case of Floppy CH3+−He

A novel rotational spectroscopy method applicable to ions stored in cold traps is presented. In a double resonance scheme, rotational excitation is followed by vibrational excitation into a dissociative resonance. Its general applicability is demonstrated for the CH3+−He complex, which undergoes pre...

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Bibliographic Details
Published in:Physical review letters 2018-10, Vol.121 (14)
Main Authors: Töpfer, Matthias, Salomon, Thomas, Kohguchi, Hiroshi, Dopfer, Otto, Yamada, Koichi M T, Schlemmer, Stephan, Asvany, Oskar
Format: Article
Language:English
Subjects:
Cold storage
Cold traps
Excitation
Rotational spectra
Spectroscopy
Spectrum analysis
Online Access:Get full text
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Summary:A novel rotational spectroscopy method applicable to ions stored in cold traps is presented. In a double resonance scheme, rotational excitation is followed by vibrational excitation into a dissociative resonance. Its general applicability is demonstrated for the CH3+−He complex, which undergoes predissociation through its C-H stretching modes ν1 and ν3. High resolution rotational transitions are recorded for this symmetric top, and small unexpected splittings are resolved for K=1. Advantages and potential future applications of this new approach are discussed.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.121.143001