593 citations · 3k across the 40 of their papers we have counts for
23 papers · 1 filter
Laser-induced forced evaporative cooling of molecular anions below 4 Kelvin
Jonas Tauch, Saba Zia Hassan, Markus Noetzold +3
The study of cold and controlled molecular ions is pivotal for fundamental research in modern physics and chemistry. Investigations into cooling molecular anions, in particular, ha…
Spectroscopy and ion thermometry of C using laser-cooling transitions
Markus Nötzold, Robert Wild, Christine Lochmann +1
A prerequisite for laser cooling a molecular anion, which has not been achieved so far, is the precise knowledge of the relevant transition frequencies in the cooling scheme. To de…
Quantum tunneling isotope exchange reaction H2 + D- -> HD + H-
Chi Hong Yuen, Mehdi Ayouz, Eric S. Endres +3
The tunneling reaction H + D HD + H was studied in a recent experimental work at low temperatures (10, 19, and 23~K) by Endres {\it et al.}, Phys. Rev. A…
Vibrational Quenching of CN- in Collisions with He and Ar
Barry Mant, Ersin Yurtsever, Lola González-Sánchez +2
The vibrational quenching cross sections and corresponding low-temperature rate constants for the v = 1 and v = 2 states of CN- colliding with He and Ar atoms have been computed ab…
Rovibrational quenching of C-anions in collisions with He, Ne, and Ar atoms
Barry P. Mant, Franco A. Gianturco, Roland Wester +2
The dicarbon molecular anion is currently of interest as a candidate for laser cooling due to its electronic structure and favorable branching ratios to the ground electronic and v…
Temperature-dependent rotationally inelastic collisions of OH- and He
Eric S. Endres, Steve Ndengue, Olga Lakhmanskaya +4
We have studied the fundamental rotational relaxation and excitation collision of OH- J=0 <-> 1 with helium at different collision energies. Using state-selected photodetachment in…
Collisional state-changing of OH rotations by interaction with Rb atoms in cold traps
L. González-Sánchez, F. Carelli, F. A. Gianturco +1
We employ an accurate, ab initio potential energy surface (PES) which describes the electronic interaction energy between the molecular anion OH () and the neutral rubid…
Incomplete rotational cooling in a 22-pole ion trap
E. S. Endres, G. Egger, S. Lee +3
Cryogenic 22-pole ion traps have found many applications in ion-molecule reaction kinetics and in high resolution molecular spectroscopy. For most of these applications it is impor…
Terahertz-visible two-photon rotational spectroscopy of cold OD-
Seunghyun Lee, Daniel Hauser, Olga Lakhmanskaya +5
We present a method to measure rotational transitions of molecular anions in the terahertz domain by sequential two-photon absorption. Ion excitation by bound-bound terahertz absor…
Sympathetic cooling of OH- ions using ultracold Rb atoms in a dark SPOT
H. López, B. Höltkemeier, J. Glässel +5
We are developing a new hybrid atom-ion trap to study the interaction of ultracold rubidium atoms with mass-selected OH- molecules. The ions are trapped inside an octupole rf-trap…
Reactive collisions of trapped anions with ultracold atoms
Johannes Deiglmayr, Anna Göritz, Thorsten Best +2
We present a scheme to embed molecular anions in a gas of ultracold rubidium atoms as a route towards the preparation of cold molecular ions by collisional cooling with ultracold a…
Population redistribution in optically trapped polar molecules
J. Deiglmayr, M. Repp, O. Dulieu +2
We investigate the rovibrational population redistribution of polar molecules in the electronic ground state induced by spontaneous emission and blackbody radiation. As a model sys…
Photoassociation and coherent transient dynamics in the interaction of ultracold rubidium atoms with shaped femtosecond pulses - II. Theory
Andrea Merli, Frauke Eimer, Fabian Weise +8
Photoassociation of ultracold rubidium atoms with femtosecond laser pulses is studied theoretically. The spectrum of the pulses is cut off in order to suppress pulse amplitude at a…
Photoassociation and coherent transient dynamics in the interaction of ultracold rubidium atoms with shaped femtosecond pulses - I. Experiment
Wenzel Salzmann, Terry Mullins, Simone Götz +10
We experimentally investigate various processes present in the photoassociative interaction of an ultracold atomic sample with shaped femtosecond laser pulses. We demonstrate the p…
Radiofrequency multipole traps: Tools for spectroscopy and dynamics of cold molecular ions
Roland Wester
Multipole radiofrequency ion traps are a highly versatile tool to study molecular ions and their interactions in a well-controllable environment. In particular the cryogenic 22-pol…
Calculations of static dipole polarizabilities of alkali dimers. Prospects for alignment of ultracold molecules
Johannes Deiglmayr, Mireille Aymar, Roland Wester +2
The rapid development of experimental techniques to produce ultracold alkali molecules opens the ways to manipulate them and to control their dynamics using external electric field…
Probing isotope effects in chemical reactions using single ions
Peter F. Staanum, Klaus Hoejbjerre, Roland Wester +1
Isotope effects in reactions between Mg+ in the 3p 2P3/2 excited state and molecular hydrogen at thermal energies are studied through single reaction events. From only ~250 reactio…
Evaporation of buffer gas-thermalized anions out of a multipole rf ion trap
J. Mikosch, U. Frühling, S. Trippel +3
We identify plain evaporation of ions as the fundamental loss mechanism out of a multipole ion trap. Using thermalized negative Cl- ions we find that the evaporative loss rate is p…
Theoretical model for ultracold molecule formation via adaptive feedback control
Ulrich Poschinger, Wenzel Salzmann, Roland Wester +3
We investigate pump-dump photoassociation of ultracold molecules with amplitude- and phase-modulated femtosecond laser pulses. For this purpose a perturbative model for the light-m…
Experimental investigation of ultracold atom-molecule collisions
Peter Staanum, Stephan D. Kraft, Joerg Lange +2
Ultracold collisions between Cs atoms and Cs2 dimers in the electronic ground state are observed in an optically trapped gas of atoms and molecules. The Cs2 molecules are formed in…
Coherent control with shaped femtosecond laser pulses applied to ultracold molecules
Wenzel Salzmann, Ulrich Poschinger, Roland Wester +9
We report on coherent control of excitation processes of translationally ultracold rubidium dimers in a magneto-optical trap by using shaped femtosecond laser pulses. Evolution str…
Saturation of Cs2 Photoassociation in an Optical Dipole Trap
S. D. Kraft, M. Mudrich, M. U. Staudt +4
We present studies of strong coupling in single-photon photoassociation of cesium dimers using an optical dipole trap. A thermodynamic model of the trap depletion dynamics is emplo…
Photoassociation inside an optical dipole trap: absolute rate coefficients and Franck-Condon factors
R. Wester, S. D. Kraft, M. Mudrich +5
We present quantitative measurements of the photoassociation of cesium molecules inside a far-detuned optical dipole trap. A model of the trap depletion dynamics is derived which a…