Publications

I. Doran, L. Jeckel, M. Beyer, Ch. Jungen, F. Merkt (2026). Stark effect in molecular Rydberg states: Calculation of Rydberg-Stark manifolds of $\mathrm{H}_2$ and $\mathrm{D}_2$ including fine and hyperfine structures. Phys. Rev. A 113, 062812 (2026).

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D. Knapp, M. Beyer (2026). State-selected preparation of diatomic molecular ions for precision measurements in radio-frequency traps. Molecular Physics, e2652534 (2026).

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L. Verdegay, B. Zeng, D. Knapp, J. C. Roth, M. Beyer (2025). Laser cooling Rydberg molecules—a detailed study of the helium dimer. New J. Phys. 27, 093201 (2025).

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K.-F. Lai, W. Ubachs, M. Beyer (2025). Precision measurement of the last bound states in $\mathrm{H}_2$ and determination of the $\mathrm{H}+\mathrm{H}$ scattering length. Phys. Rev. A 111, 022803 (2025).

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I. Doran, M. Beyer, F. Merkt (2024). Rotational and spin-rotational level structure of para-$\mathrm{H}_2^+$ from high-resolution multichannel-quantum-defect-theory-assisted Rydberg-state spectroscopy. Phys. Rev. A 110, 062804 (2024).

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I. Doran, N. Hölsch, M. Beyer, F. Merkt (2024). Zero-Quantum-Defect Method and the Fundamental Vibrational Interval of $\mathrm{H}_2^+$. Phys. Rev. Lett. 132, 073001 (2024).

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N. Hölsch, I. Doran, F. Merkt, J. Hussels, C.-F. Cheng, E. J. Salumbides, H. L. Bethlem, K. S. E. Eikema, M. Beyer, W. Ubachs, Ch. Jungen (2023). Ionization and dissociation energies of HD and dipole-induced g/u-symmetry breaking. Phys. Rev. A 108, 022811 (2023).

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C. Roth, A. Martínez de Velasco, E. L. Gründeman, M. Collombon, M. Beyer, V. Barbé, K. S. E. Eikema (2023). High-precision Ramsey-comb spectroscopy on molecular deuterium for tests of molecular quantum theory. Mol. Phys. e2211405 (2023).

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K.-F. Lai, M. Beyer, W. Ubachs (2023). Spectroscopic study of the F outer well state in H$_2$, HD and D$_2$. J. Mol. Spectrosc. 393, 111778 (2023).

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D. Ochoa, M. Beyer (2022). Black-body radiation-induced photodissociation and population redistribution of weakly bound states in H$_2^+$. Mol. Phys. , e2133750 (2022).

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N. Hölsch, I. Doran, M. Beyer, F. Merkt (2022). Precision millimetre-wave spectroscopy and calculation of the Stark manifolds in high Rydberg states of para-H$_2$. J. Mol. Spectrosc. 387, 111648 (2022).

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M. Beyer, F. Merkt (2022). Structure and dynamics of HD$^+$ in the vicinity of the H$^+$ + D and D$^+$ + H dissociation thresholds: Feshbach resonances and the role of g/u-symmetry breaking. Mol. Phys. , e2048108 (2022).

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J. Hussels, N. Hölsch, C.-F. Cheng, E. J. Salumbides, H. L. Bethlem, K. S. E. Eikema, Ch. Jungen, M. Beyer, F. Merkt, W. Ubachs (2022). Improved ionization and dissociation energies of the deuterium molecule. Phys. Rev. A 105, 022820 (2022).

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K.-F. Lai, E. J. Salumbides, M. Beyer, W. Ubachs (2021). Precision measurement of quasi-bound resonances in H$_2$ and the H+H scattering length. Mol. Phys. e2018063 (2021).

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K.-F. Lai, E. J. Salumbides, W. Ubachs, M. Beyer (2021). Shape Resonances in H$_2$ as Photolysis Reaction Intermediates. Phys. Rev. Lett. 127, 183001 (2021).

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M. Beyer, J. C. Roth, E. Edwards, D. DeMille (2021). Frequency-doubled Nd:YAG MOPA laser system with programmable rectangular pulses up to 200 microseconds. Optics Express 29, 20370 (2021).

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K.-F. Lai, M. Beyer, E. J. Salumbides, W. Ubachs (2021). Photolysis Production and Spectroscopic Investigation of the Highest Vibrational States in H$_2$ (X $v = 13, 14$). J. Phys. Chem. A 125, 1221 (2021).

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M. Beyer, N. Hölsch, J. Hussels, C.-F. Cheng, E. J. Salumbides, K. S. E. Eikema, W. Ubachs, Ch. Jungen, F. Merkt (2019). Determination of the Interval between the Ground States of Para- and Ortho-H$_2$. Phys. Rev. Lett. 123, 163002 (2019).

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N. Hölsch, M. Beyer, E. J. Salumbides, K. S. E. Eikema, W. Ubachs, Ch. Jungen, F. Merkt (2019). Benchmarking Theory with an Improved Measurement of the Ionization and Dissociation Energies of H$_2$. Phys. Rev. Lett. 122, 103002 (2019).

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M. Beyer, F. Merkt (2018). Hyperfine-interaction-induced g/u mixing and its implication on the existence of the first excited vibrational level of the A$^+$ state of H$_2^+$ and on the scattering length of the H + H$^+$ collision. J. Chem. Phys. 149, 214301 (2018).

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N. Hölsch, M. Beyer, F. Merkt (2018). Nonadiabatic effects on the positions and lifetimes of the low-lying rovibrational levels of the GK and H states of H$_2$. Phys. Chem. Chem. Phys. 20, 26837 (2018).

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M. Beyer, F. Merkt (2018). Half-Collision Approach to Cold Chemistry: Shape Resonances, Elastic Scattering, and Radiative Association in the H$^+$ + H and D$^+$ + D Collision Systems. Phys. Rev. X 8, 031085 (2018).

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M. Beyer, F. Merkt (2018). Communication: Heavy-Rydberg states of HD and the electron affinity of the deuterium atom. J. Chem. Phys. 149, 031102 (2018).

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C.-F. Cheng, J. Hussels, M. Niu, H. L. Bethlem, K. S. E. Eikema, E. J. Salumbides, W. Ubachs, M. Beyer, N. Hölsch, J. A. Agner, F. Merkt, L.-G. Tao, S.-M. Hu, Ch. Jungen (2018). Dissociation Energy of the Hydrogen Molecule at $10^{-9}$ Accuracy. Phys. Rev. Lett. 121, 013001 (2018).

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M. Beyer, N. Hölsch, J. A. Agner, J. Deiglmayr, H. Schmutz, F. Merkt (2018). Metrology of high-n Rydberg states of molecular hydrogen with $10^{-10}$ accuracy. Phys. Rev. A 97, 012501 (2018).

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M. Beyer, F. Merkt (2017). High-resolution photoelectron spectroscopy and calculations of the highest bound levels of D$_2^+$ below the first dissociation threshold. J. Phys. B: At. Mol. Opt. Phys. 50, 154005 (2017).

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M. Beyer, F. Merkt (2016). Structure and dynamics of H$_2^+$ near the dissociation threshold: A combined experimental and computational investigation. J. Mol. Spectrosc. 330, 147 (2016).

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M. Beyer, F. Merkt (2016). Observation and Calculation of the Quasibound Rovibrational Levels of the Electronic Ground State of H$_2^+$. Phys. Rev. Lett. 116, 093001 (2016).

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Ch. Haase, M. Beyer, Ch. Jungen, F. Merkt (2015). The fundamental rotational interval of para-H$_2^+$ by MQDT-assisted Rydberg spectroscopy of H$_2$. J. Chem. Phys. 142, 064310 (2015).

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D. Sprecher, M. Beyer, F. Merkt (2013). Precision measurement of the ionisation energy of the 3dσ GK state of H$_2$. Mol. Phys. 111(14-15), 2100 (2013).

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D. Sprecher, M. Beyer, F. Merkt (2013). Precision measurements of ionization and dissociation energies by extrapolation of Rydberg series: From H$_2$ to larger molecules. Chimia 67(4), 257-261 (2013).

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