High-resolution double resonance action spectroscopy in ion traps: vibrational and rotational fingerprints of ch2nh2+
Thorwirth, Sven
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https://hdl.handle.net/2142/107463
Description
Title
High-resolution double resonance action spectroscopy in ion traps: vibrational and rotational fingerprints of ch2nh2+
Author(s)
Thorwirth, Sven
Contributor(s)
Schlemmer, Stephan
Asvany, Oskar
Markus, Charles R.
Issue Date
2020-06-23
Keyword(s)
Astronomy
Abstract
Applying various action spectroscopic techniques in a 4~K cryogenic ion trap
instrument, protonated methanimine, CH$_2$NH$_2^+$, 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 $\nu_2$ symmetric C-H stretch were measured around 3026\,cm$^{-1}$, which were used to predict pure
rotational transition frequencies of CH$_2$NH$_2^+$ 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.
This method consists of rotational excitation
followed by vibrational excitation, which is finally detected as a
dip in the number of CH$_2$NH$_2^+$-He complexes formed in the 4~K He bath of the trap.
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