Molecular Physics and Spectroscopy

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2025

[293]F. Martins, H. Schmutz, J. A. Agner, V. Zhelyazkova, and F. Merkt
«Microwave-controlled cold chemistry»
Phys. Rev. Lett. 134(12), 123401 (2025)
doi: external page 10.1103/PhysRevLett.134.123401
[292]G. Clausen, K. Gamlin, J. A. Agner, H. Schmutz, and F. Merkt
«Metrology in a two-electron atom: The ionization energy of metastable triplet helium (2 3S1)»
Phys. Rev. A 111(1), 012817 (2025)
doi: external page 10.1103/PhysRevA.111.012817
[291]J. R. Schmitz, and F. Merkt
«Characterisation of the electronic ground states of BaH+ and BaD+ by high-resolution photoelectron spectroscopy»
Phys. Chem. Chem. Phys. 27(3), 1310-1319 (2025)
doi: external page 10.1039/d4cp04323e

 

2024

[290]I. Doran, M. Beyer, and F. Merkt
«Rotational and spin-rotational level structure of para-H2+ from high-resolution multichannel-quantum-theory-assisted Rydberg-state spectroscopy»
Phys. Rev. A 110(6), 062804 (2024)
doi: external page 10.1103/PhysRevA.110.062804
[289]F. B. V. Martins, V. Zhelyazkova, and F. Merkt
«Cold reactions of He+ with OCS and CO2: competitive kinetics and the effects of the molecular multipole moments»
Phys. Chem. Chem. Phys. 26, 24799-24808 (2024)
doi: external page 10.1039/d4cp02871f
[288]G. Clausen, L. Gabriel, J. A. Agner, H. Schmutz, T. Thiele, A. Wallraff, and F. Merkt
«Combining laser cooling and Zeeman deceleration for precision spectroscopy in supersonic beams»
Phys. Rev. A 110(4), 042802 (2024)
doi: external page 10.1103/physreva.110.042802
[287]C. Kreis, J. R. Schmitz, and F. Merkt
«Characterisation of the ground X+ 2∏Ω and first excited A+ 2∑+ electronic states of MgO+ by high-resolution photoelectron spectroscopy»
Phys. Chem. Chem. Phys. 26(28), 19359-19368 (2024)
doi: external page 10.1039/d4cp01944j
[286]C. Kreis, J. R. Schmitz, and F. Merkt
«High-Resolution Photoelectron Spectroscopy of the Ground and First Excited Electronic States of MgXe+»
J. Phys. Chem. A 128(16), 3149-3157 (2024)
doi: external page 10.1021/acs.jpca.4c00940
[285]H. Herburger, E. N. Toutoudaki, U. Hollenstein, and F. Merkt
«High-resolution spectroscopy and MQDT analysis of the np and nf Rydberg series of Xe below the 2P3/2 ionization threshold»
Phys. Rev. A 109(3), 032816 (2024)
doi: external page 10.1103/PhysRevA.109.032816
[284]C. Kreis, J. R. Schmitz, and F. Merkt
«High-resolution photoelectron spectroscopy of the very weakly bound MgNe molecule»
Mol. Phys. 122(15-16), e2297814 (2024)
doi: external page 10.1080/00268976.2023.2297814
[283]I. Doran, N. Hölsch, M. Beyer, and F. Merkt
«The Zero-Quantum-Defect Method and the Fundamental Vibrational Interval of H2+»
Phys. Rev. Lett. 132(7), 073001 (2024)
doi: external page 10.1103/PhysRevLett.132.073001
[282]S. Scheidegger, and F. Merkt
«Precision-Spectroscopic Determination of the Binding Energy of a Two-Body Quantum System: The Hydrogen Atom and the Proton-Size Puzzle»
Phys. Rev. Lett. 132(11), 113001 (2024)
doi: external page 10.1103/PhysRevLett.132.113001
[281]R. Hahn, D. Schlander, V. Zhelyazkova, and F. Merkt
«Opposite effects of the rotational and translational energy on the rates of ion-molecule reactions near 0 K: the D2+ + NH3 and D2+ + ND3 reactions»
Phys. Rev. X 14(1), 011034 (2024)
doi: external page 10.1103/PhysRevX.14.011034

 

2021

[260]

F. B. V. Martins, V. Zhelyazkova, Ch. Seiler, and F. Merkt
«Cold ion chemistry within a Rydberg-​electron orbit: test of the spectator role of the Rydberg electron in the He(n) + CO → C(n') + O + He reaction»
New J. Phys. 23(9), 095011 (2021)
doi: external page 10.1088/1367-​2630/ac231d

[259]

V. Zhelyazkova, F. B. V. Martins, J. A. Agner, H. Schmutz, and F. Merkt
«Multipole-​moment effects in ion–molecule reactions at low temperatures: part I – ion-​dipole enhancement of the rate coefficients of the He+ + NH3 and He+ + ND3 reactions at collisional energies Ecoll/kB near 0 K»
Phys. Chem. Chem. Phys. 23(38), 21606-​21622 (2021)
doi: external page 10.1039/D1CP03116C

[258]

M. Génévriez, D. Wehrli, T. Berglitsch, and F. Merkt
«Characterization of the 3dδ Rydberg state of MgAr+ using a quantum-​control optical scheme»
Phys. Rev. A 104(4), 042811 (2021)
doi: external page 10.1103/PhysRevA.104.042811

[257]

K. Höveler, J. Deiglmayr, and F. Merkt
«Deviation of the rate of the H2+ + D2 reaction from Langevin behaviour below 1 K, branching ratios for the HD2+ + H and H2D+ + D product channels, and product-​kinetic-energy distributions»
Mol. Phys. 119, e1954708 (2021), Jörgen Troe Special Issue
doi: external page 10.1080/00268976.2021.1954708

[256]

D. Wehrli, M. Génévriez, S. Knecht, M. Reiher, and F. Merkt
«Charge-​transfer-induced predissociation in Rydberg states of molecular cations: MgAr+»
J. Phys. Chem. A 125(31), 6681–6696 (2021)
doi: external page 10.1021/acs.jpca.1c03859

[255]

G. Clausen, P. Jansen, S. Scheidegger, J. A. Agner, H. Schmutz, and F. Merkt
«Ionization energy of the metastable 2 1S0 state of 4He from Rydberg-​series extrapolation»
Phys. Rev. Lett. 127(9), 093001 (2021)
doi: external page 10.1103/PhysRevLett.127.093001

[254]

D. Husmann, L.-G. Bernier, M. Bertrand, D. Calonico, K. Chaloulos, G. Clausen, C. Clivati, J. Faist, E. Heiri, U. Hollenstein, A. Johnson, F. Mauchle, Z. Meir, F. Merkt, A. Mura, G. Scalari, S. Scheidegger, H. Schmutz, M. Sinhal, S. Willitsch, and J. Morel
«SI-​traceable frequency dissemination at 1572.06 nm in a stabilized fiber network with ring topology»
Opt. Express 29(16), 24592–24605 (2021)
doi: external page 10.1364/OE.427921

[253]

D. Wehrli, M. Génévriez, and F. Merkt
«Spectroscopic characterization of a thermodynamically stable doubly charged diatomic molecule: MgAr2+»
Phys. Chem. Chem. Phys. 23(18), 10978 (2021)
doi: external page 10.1039/d1cp00730k

[252]

D. Wehrli, U. Hollenstein and F. Merkt
«Line shapes and line positions in PFI-​ZEKE photoelectron and MATI spectra of positively charged ions»
Mol. Phys. 119(10), e1900613 (2021)
doi: external page 10.1080/00268976.2021.1900613

[251]

K. Höveler, J. Deiglmayr, J. A. Agner, H. Schmutz and F. Merkt
«The H2+ + HD reaction at low collision energies: H3+/H2D+ branching ratio and product-​kinetic-energy distributions»
Phys. Chem. Chem. Phys. 23(4), 2676-​2685 (2021)
doi: external page 10.1039/d0cp06107g

 
2020
[250]V. Zhelyazkova, F. B. V. Martins, J. A. Agner, H. Schmutz and F. Merkt
«Ion-molecule reactions below 1K: Strong enhancement of the reaction rate of the ion-dipole reaction He3 + CH3F»
Phys. Rev. Lett. 125(26), 263401 (2020)
doi: external page 10.1103/PhysRevLett.125.263401
[249]P. Jansen and F. Merkt
«Manipulating beams of paramagnetic atoms and molecules using inhomogeneous magnetic fields»
Prog. Nucl. Magn. Reson. Spectrosc. 120-121, 118-148 (2020)
doi: external page 10.1016/j.pnmrs.2020.08.002
[248]M. Génévriez, D. Wehrli, and F. Merkt
«Complete characterization of the 3p Rydberg complex of a molecular ion: MgAr+. II. Global analysis of the A+ 2Π and B+ 2Σ+ (3pσ,π) states»
J. Chem. Phys. 153(7), 074311 (2020)
doi: external page 10.1063/5.0015608
[247]D. Wehrli, M. Génévriez, S. Knecht, M. Reiher, and F. Merkt
«Complete characterization of the 3p Rydberg complex of a molecular ion: MgAr+. I. Observation of the Mg(3pσ)Ar+B+ state and determination of its structure and dynamics»
J. Chem. Phys. 153(7), 074310 (2020)
doi: external page 10.1063/5.0015603
[246]M. Žeško, O. Tkáč, J. A. Agner, H. Schmutz and F. Merkt
«Rydberg-Stark deceleration and trapping of helium in magnetic fields»
J. Phys. B: At. Mol. Opt. Phys. 53(19), 195003 (2020)
doi: external page 10.1088/1361-6455/aba662
[245]L. Semeria, P. Jansen, G.-M. Camenisch, F. Mellini, H. Schmutz, and F. Merkt
«Precision measurements in few-electron molecules: The ionization energy of metastable 4He2 and the first rotational interval of 4He2+»
Phys. Rev. Lett. 124(21), 213001 (2020)
doi: external page 10.1103/PhysRevLett.124.213001
[244]S. Scheidegger and F. Merkt
«Spectroscopy of highly excited states of the hydrogen atom»
Chimia 74(4), 285-288 (2020)
doi: external page 10.2533/chimia.2020.285
[243]M. Génévriez, D. Wehrli, and F. Merkt
«High-resolution spectroscopy of the A+ 2Π ← X+ 2Σ+ transition of MgAr+ by isolated-core multiphoton Rydberg dissociation»
Mol. Phys. 118(11), e1703051 (2020)
doi: external page 10.1080/00268976.2019.1703051
[242]D. Wehrli, M. Génévriez, C. Kreis, J. A. Agner, and F. Merkt
«Determination of the interaction potential and rovibrational structure of the ground electronic state of MgAr+ using PFI-ZEKE photoelectron spectroscopy»
J. Phys. Chem. A 124(2), 379-385 (2020)
doi: external page 10.1021/acs.jpca.9b10435
 M. Génévriez
«Theoretical approaches for doubly-excited Rydberg states in quasi-two-electron systems: two-electron dynamics far away from the nucleus»
Mol. Phys. e1861353 (2020)
doi: external page 10.1080/00268976.2020.1861353
 
2017
[216]U. Jacovella and F. Merkt
«Spin-orbit interaction and Renner-Teller effect in HCCCCH+ studied by high-resolution photoelectron spectroscopy»
Phys. Chem. Chem. Phys. 19(34), 23524 (2017)
doi: external page 10.1039/C7CP04759B
[215]M. Beyer and F. Merkt
«High-resolution photoelectron spectroscopy and calculations of the highest bound levels of D2+ below the first dissociation threshold»
J. Phys. B: At. Mol. Opt. Phys. 50(15), 154005 (2017)
doi: external page 10.1088/1361-6455/aa7ac9
[214]M. Stammeier, S. Garcia, T. Thiele, J. Deiglmayr, J. A. Agner, H. Schmutz, F. Merkt, and A. Wallraff
«Measuring the dispersive frequency shift of a rectangular microwave cavity induced by an ensemble of Rydberg atoms»
Phys. Rev. A 95(5), 053855 (2017)
doi: external page 10.1103/PhysRevA.95.053855
[212]J. Koepsell, T. Thiele, J. Deiglmayr, A. Wallraff, and F. Merkt
«Measuring the polarization of electromagnetic fields using Rabi-rate measurements with spatial resolution: experiment and theory»
Phys. Rev. A 95(5), 053860 (2017)
doi: external page 10.1103/PhysRevA.95.053860
[211]U. Hollenstein, H. Schmutz, J. A. Agner, M. Sommavilla, and F. Merkt
«Vacuum-ultraviolet frequency-modulation spectroscopy»
J. Chem. Phys. 146(1), 014201 (2017)
doi: external page 10.1063/1.4973011
 
2000
[46]A. Osterwalder, R. Seiler, and F. Merkt,
«Measurement of the hyperfine structure in low-l, high-n Rydberg states of ortho H2 by millimeter wave spectroscopy»
J. Chem. Phys. 113(18), 7939-7944 (2000)
doi: external page 10.1063/1.1315608
[45]U. Hollenstein, H. Palm, and F. Merkt,
«A broadly tunable extreme ultraviolet laser source with a 0.008 cm-1 bandwidth»
Rev. Sci. Instrum. 71(11), 4023-4028 (2000)
doi: external page 10.1063/1.1310344
[44]F. Merkt,
«High-resolution spectroscopy of high Rydberg states: Chemical and technological applications»
Chimia 54(3), 89-95 (2000)
[43]R. Signorell and F. Merkt,
«PFI-ZEKE photoelectron spectra of the methane cation and the dynamic Jahn-Teller effect»
Faraday Discuss. 115, 205-228 (2000)
doi: external page 10.1039/a909272b
 
1991
[5]H. H. Fielding, T. P. Softley, and F. Merkt, 
«Photoionization and ZEKE photoelectron spectroscopy of Ar, H2 and CO2 using a coherent XUV laser source»
Chem. Phys. 155(2), 257–265 (1991)
doi: external page 10.1016/0301-0104(91)87025-Q
[4]F. Merkt and T. P. Softley,
«Prediction of rotational line intensities in double-enhanced four-wave mixing (DEFMI) spectroscopy»
Mol. Phys. 72(4), 787–801 (1991)
doi: external page 10.1080/00268979100100561