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Issue 48, 2019
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High-resolution double resonance action spectroscopy in ion traps: vibrational and rotational fingerprints of CH2NH2+

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Abstract

By applying various action spectroscopic techniques in a 4 K cryogenic ion trap instrument, protonated methanimine, CH2NH2+, has been investigated by high-resolution rovibrational and pure rotational spectroscopy for the first time. In total, 39 rovibrational transitions within the fundamental band of the ν2 symmetric C–H stretch were measured around 3026 cm−1, which were used to predict pure rotational transition frequencies of CH2NH2+ in the ground vibrational state. Based on these predictions, nine rotational transitions were observed between 109 and 283 GHz using a novel double resonance method, which significantly improved the sensitivity of the rotational measurements. This double resonance method consists of rotational excitation followed by vibrational excitation, which is finally detected as a dip in the number of CH2NH2+–He complexes formed in the 4 K He bath of the trap. The new measurements and the derived predictions of pure rotational transitions will enable the first radio-astronomical search for CH2NH2+.

Graphical abstract: High-resolution double resonance action spectroscopy in ion traps: vibrational and rotational fingerprints of CH2NH2+

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Publication details

The article was received on 08 Oct 2019, accepted on 20 Nov 2019 and first published on 21 Nov 2019


Article type: Paper
DOI: 10.1039/C9CP05487A
Phys. Chem. Chem. Phys., 2019,21, 26406-26412

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    High-resolution double resonance action spectroscopy in ion traps: vibrational and rotational fingerprints of CH2NH2+

    C. R. Markus, S. Thorwirth, O. Asvany and S. Schlemmer, Phys. Chem. Chem. Phys., 2019, 21, 26406
    DOI: 10.1039/C9CP05487A

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