Ionization Energy of Rb$_2$ by electric field-ionization of molecular Rydberg states
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Torres, Manuel Alejandro Lefrán Fernández, David Rodríguez Márquez, Jaime Javier Borges Cardoso, Marcos Roberto Marcassa, Luis Gustavo Pandey, Amrendra Vexiau, Romain Dulieu, Olivier Bouloufa-Maafa, Nadia |
| author_facet | Torres, Manuel Alejandro Lefrán Fernández, David Rodríguez Márquez, Jaime Javier Borges Cardoso, Marcos Roberto Marcassa, Luis Gustavo Pandey, Amrendra Vexiau, Romain Dulieu, Olivier Bouloufa-Maafa, Nadia |
| contents | We report the measurement of the ionization energy of the $^{85}\text{Rb}_2$ molecule through resonantly enhanced 2-photon ionization in a supersonic beam. The first photon excites the $X^1Σ_g^+ (v_X = 0)\rightarrow B^1Π_u (v_B = 2)$ transition, while the second photon wavenumber is scanned over the 16720 cm$^{-1}$-16750 cm$^{-1}$ range, thus yielding a structured spectrum of Rb$_2^+$ ions extracted by an electric field and recorded by mass spectrometry. We modeled the onset of the ionization signal as a function of the electric field strength between $18 V/cm$ and $180 V/cm$, leading to the Rb$_2$ ionization energy $E_i = 31497.3 \pm 0.6 $cm$^{-1}$, and to the dissociation energy of the Rb$_2^+$ ground state $D_0 = 6158.2 \pm 0.6$ cm$^{-1}$. Our measured value $E_i$ is found to be $149.3$ cm$^{-1}$ larger than the one reported in the experiment by Bellos et al. [Phys. Rev. A 87, 012508 (2013)]. Our value of $D_0$ agrees with our theoretical determination using a quantum chemistry approach. Using a simple theoretical model, we assign unevenly spaced structures of the ionization spectrum to molecular Rydberg levels belonging to several series that converge to the lowest vibrational levels of Rb$_2^+$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_08634 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ionization Energy of Rb$_2$ by electric field-ionization of molecular Rydberg states Torres, Manuel Alejandro Lefrán Fernández, David Rodríguez Márquez, Jaime Javier Borges Cardoso, Marcos Roberto Marcassa, Luis Gustavo Pandey, Amrendra Vexiau, Romain Dulieu, Olivier Bouloufa-Maafa, Nadia Atomic Physics We report the measurement of the ionization energy of the $^{85}\text{Rb}_2$ molecule through resonantly enhanced 2-photon ionization in a supersonic beam. The first photon excites the $X^1Σ_g^+ (v_X = 0)\rightarrow B^1Π_u (v_B = 2)$ transition, while the second photon wavenumber is scanned over the 16720 cm$^{-1}$-16750 cm$^{-1}$ range, thus yielding a structured spectrum of Rb$_2^+$ ions extracted by an electric field and recorded by mass spectrometry. We modeled the onset of the ionization signal as a function of the electric field strength between $18 V/cm$ and $180 V/cm$, leading to the Rb$_2$ ionization energy $E_i = 31497.3 \pm 0.6 $cm$^{-1}$, and to the dissociation energy of the Rb$_2^+$ ground state $D_0 = 6158.2 \pm 0.6$ cm$^{-1}$. Our measured value $E_i$ is found to be $149.3$ cm$^{-1}$ larger than the one reported in the experiment by Bellos et al. [Phys. Rev. A 87, 012508 (2013)]. Our value of $D_0$ agrees with our theoretical determination using a quantum chemistry approach. Using a simple theoretical model, we assign unevenly spaced structures of the ionization spectrum to molecular Rydberg levels belonging to several series that converge to the lowest vibrational levels of Rb$_2^+$. |
| title | Ionization Energy of Rb$_2$ by electric field-ionization of molecular Rydberg states |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2507.08634 |