Angle-resolved photoelectron spectroscopy of the DABCO molecule probed with VUV radiation
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| Format: | Preprint |
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2026
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| _version_ | 1866913000867233792 |
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| author | Scognamiglio, Audrey Barreau, Lou Schouder, Constant Cubaynes, Denis Gans, Bérenger Gloaguen, Éric Garcias, Gustavo A. Nahon, Laurent Poisson, Lionel |
| author_facet | Scognamiglio, Audrey Barreau, Lou Schouder, Constant Cubaynes, Denis Gans, Bérenger Gloaguen, Éric Garcias, Gustavo A. Nahon, Laurent Poisson, Lionel |
| contents | We report a study of the diazabicyclo[2.2.2]octane (DABCO) molecule photoionized using VUV synchrotron radiation in combination with an ion--electron coincidence spectrometer. We determine accurately the adiabatic ionization energy to $7.199\pm0.006$~eV. Two vibrational progressions of DABCO cation ground state are resolved at $847~\text{cm}^{-1}\pm27~\text{cm}^{-1}$ and $1257~\text{cm}^{-1}\pm67~\text{cm}^{-1}$, which we assign to modes of $e'$ symmetry. Analysis of the photoelectron angular distribution shows that the anisotropy parameter depends on the vibrational excitation. This dependence of the $β$ parameter with the vibrational excitation is attributed to the scattering of the outgoing wavefunction mediated by high-lying Rydberg states. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_02534 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Angle-resolved photoelectron spectroscopy of the DABCO molecule probed with VUV radiation Scognamiglio, Audrey Barreau, Lou Schouder, Constant Cubaynes, Denis Gans, Bérenger Gloaguen, Éric Garcias, Gustavo A. Nahon, Laurent Poisson, Lionel Atomic Physics Chemical Physics We report a study of the diazabicyclo[2.2.2]octane (DABCO) molecule photoionized using VUV synchrotron radiation in combination with an ion--electron coincidence spectrometer. We determine accurately the adiabatic ionization energy to $7.199\pm0.006$~eV. Two vibrational progressions of DABCO cation ground state are resolved at $847~\text{cm}^{-1}\pm27~\text{cm}^{-1}$ and $1257~\text{cm}^{-1}\pm67~\text{cm}^{-1}$, which we assign to modes of $e'$ symmetry. Analysis of the photoelectron angular distribution shows that the anisotropy parameter depends on the vibrational excitation. This dependence of the $β$ parameter with the vibrational excitation is attributed to the scattering of the outgoing wavefunction mediated by high-lying Rydberg states. |
| title | Angle-resolved photoelectron spectroscopy of the DABCO molecule probed with VUV radiation |
| topic | Atomic Physics Chemical Physics |
| url | https://arxiv.org/abs/2604.02534 |