Zobrazeno 1 - 10
of 94
pro vyhledávání: '"Schmutz Hansjürg"'
We present a method to precisly measure the frequencies of transitions to high-$n$ Rydberg states of the hydrogen atom which are not subject to uncontrolled systematic shifts caused by stray electric fields. The method consists in recording Stark spe
Externí odkaz:
http://arxiv.org/abs/2309.12721
Skimmed supersonic beams provide intense, cold, collision-free samples of atoms and molecules are one of the most widely used tools in atomic and molecular laser spectroscopy. High-resolution optical spectra are typically recorded in a perpendicular
Externí odkaz:
http://arxiv.org/abs/2308.08329
Autor:
Zhelyazkova, Valentina, Martins, Fernanda B. V., Agner, Josef A., Schmutz, Hansjürg, Merkt, Frédéric
Publikováno v:
Phys. Chem. Chem. Phys., 2021, 23, 21606-21622
The energy dependence of the rates of the reactions between He$^+$ and ammonia (NY$_3$, Y= {H,D}), forming NY$_2^+$, Y and He as well as NY$^+$, Y$_2$ and He, and the corresponding product branching ratios have been measured at low collision energies
Externí odkaz:
http://arxiv.org/abs/2112.14532
Autor:
Zhelyazkova, Valentina, Martins, Fernanda B. V., Agner, Josef A., Schmutz, Hansjürg, Merkt, Frédéric
Publikováno v:
Physical Review Letters, 2020
The reaction between He$^+$ and CH$_3$F forming predominantly CH$_2^+$ and CHF$^+$ has been studied at collision energies $E_{\rm coll}$ between 0 and $k_{\rm B}\cdot 10$~K in a merged-beam apparatus. To avoid heating of the ions by stray electric fi
Externí odkaz:
http://arxiv.org/abs/2112.12056
Autor:
Husmann, Dominik, Bernier, Laurent-Guy, Bertrand, Mathieu, Calonico, Davide, Chaloulos, Konstantinos, Clausen, Gloria, Clivati, Cecilia, Faist, Jérôme, Heiri, Ernst, Hollenstein, Urs, Johnson, Anatoly, Mauchle, Fabian, Meir, Ziv, Merkt, Frédéric, Mura, Alberto, Scalari, Giacomo, Scheidegger, Simon, Schmutz, Hansjürg, Sinhal, Mudit, Willitsch, Stefan, Morel, Jacques
Frequency dissemination in phase-stabilized optical fiber networks for metrological frequency comparisons and precision measurements are promising candidates to overcome the limitations imposed by satellite techniques. However, network constraints re
Externí odkaz:
http://arxiv.org/abs/2104.09966
Autor:
Semeria, Luca, Jansen, Paul, Camenisch, Gian-Marco, Mellini, Federico, Schmutz, Hansjürg, Merkt, Frédéric
Publikováno v:
Phys. Rev. Lett. 124, 213001 (2020)
Molecular helium represents a benchmark system for testing $\textit{ab initio}$ calculations on few-electron molecules. We report on the determination of the adiabatic ionization energy of the $a\,^3\Sigma_u^+$ state of He$_2$, corresponding to the e
Externí odkaz:
http://arxiv.org/abs/2006.02916
Akademický článek
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.
Autor:
Peper, Michael, Helmrich, Felix, Butscher, Jonas, Agner, Josef Anton, Schmutz, Hansjürg, Merkt, Frédéric, Deiglmayr, Johannes
Publikováno v:
Peper, M. et al. Precision measurement of the ionization energy and quantum defects of $^{39}\mathrm{K}$ I, Phys. Rev. A 100, 012501 (2019)
We present absolute-frequency measurements in ultracold 39K samples of the transitions from the ground state to np Rydberg states. A global nonlinear regression of the np1/2 and np3/2 term values yields an improved wave number of 35009.8139710(22)(sy
Externí odkaz:
http://arxiv.org/abs/1907.02776
Metastable (1s)(2s) $^3{\rm S}_1$ helium atoms produced in a supersonic beam were excited to Rydberg-Stark states (with $n$ in the $27-30$ range) in a cryogenic environment and subsequently decelerated by, and trapped above, a surface-electrode decel
Externí odkaz:
http://arxiv.org/abs/1904.07628
Autor:
Allmendinger, Pitt, Deiglmayr, Johannes, Schullian, Otto, Höveler, Katharina, Agner, Josef A., Schmutz, Hansjürg, Merkt, Frédéric
Publikováno v:
ChemPhysChem 17(22), 3596--3608 (2016)
Studies of ion-molecule reactions at low temperatures are difficult because stray electric fields in the reaction volume affect the kinetic energy of charged reaction partners. We describe a new experimental approach to study ion-molecule reactions a
Externí odkaz:
http://arxiv.org/abs/1705.00871