High Resolution Rovibrational and Rotational Spectroscopy of H_2CCCH^+
arxiv(2024)
摘要
The rovibrational spectrum of the molecular ion H_2CCCH^+ was
investigated in a 4 K cryogenic ion trap instrument employing the leak-out
spectroscopy method. Transitions within the fundamental ν_1 (C-H stretch)
and the combination band ν_3+ν_5 (C-C stretches) were detected, the
search aided by high level quantum chemical calculations. The analysis of the
rovibrational measurements enabled us to predict the rotational structure of
the ground state. Using a rotational-vibrational double-resonance scheme, 14
pure rotational transitions were measured. This, in turn, led to the radio
astronomical detection of H_2CCCH^+ in the interstellar medium, as recently
reported (Silva et al., Astron. Astrophys. 676, L1, 2023).
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