Femtosecond wavepacket interferometry using the rotational dynamics of a trapped cold molecular ion

Berglund, Jeff.; Drewsen, Michael; Koch, Christiane P.

doi:10.1088/1367-2630/17/2/025007

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…Precision spectroscopy represents another important area of application for state-selectively prepared molecular ions. In particular, cold molecular ions could be used for mass spectroscopy [338,339], in optical clocks [340], and to experimentally measure molecular parameters [341]. The latter proposal specifically exploits the rotational dynamics of a state-selectively prepared, trapped molecular ion in a Ramsey-type interferometer to determine the polarizability anisotropy.…”

Section: Rotationally Cold Molecular Ionsmentioning

confidence: 99%

Quantum control of molecular rotation

2019

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The angular momentum of molecules, or, equivalently, their rotation in three-dimensional space, is ideally suited for quantum control. Molecular angular momentum is naturally quantized, time evolution is governed by a well-known Hamiltonian with only a few accurately known parameters, and transitions between rotational levels can be driven by external fields from various parts of the electromagnetic spectrum. Control over the rotational motion can be exerted in one-, two-and many-body scenarios, thereby allowing to probe Anderson localization, target stereoselectivity of bimolecular reactions, or encode quantum information, to name just a few examples. The corresponding approaches to quantum control are pursued within separate, and typically disjoint, subfields of physics, including ultrafast science, cold collisions, ultracold gases, quantum information science, and condensed matter physics. It is the purpose of this review to present the various control phenomena, which all rely on the same underlying physics, within a unified framework. To this end, we recall the Hamiltonian for free rotations, assuming the rigid rotor approximation to be valid, and summarize the different ways for a rotor to interact with external electromagnetic fields. These interactions can be exploited for control -from achieving alignment, orientation, or laser cooling in a one-body framework, steering bimolecular collisions, or realizing a quantum computer or quantum simulator in the many-body setting. IntroductionMolecules, unlike atoms, are extended objects that possess a number of different types of internal motion. In particular, the geometric arrangement of their constituent atoms endows molecules with the basic capability to rotate in three-dimensional space. Rotations can couple to vibrations of the atomic nuclei as well as to the orbital and spin angular momentum of the electrons. The resulting complexity of the energy level structure [1,2,3,4] may be daunting. It offers, on the other hand, a variety of knobs for control and thus is at the core of numerous applications, from the classic example of the ammonia maser [5] all the way to recent measurements of the electron's electric dipole moment in a cryogenic molecular beam of thorium monoxide [6].A key advantage of internal degrees of freedom such as rotation is that they occupy the low-energy part of the energy spectrum. Quantization of the rotational motion has been an early hallmark of quantum mechanics due to its connection to selection rules that govern all light-matter interactions [7]. Nowadays, rotational states and rotational molecular dynamics feature prominently in all active areas of AMO physics research as well as in neighbouring fields such as physical chemistry and quantum information science. Control over the rotational motion is crucial in one-body, two-body and many-body scenarios. For example, rotational state-selective excitation could pave the way towards separating left-and right handed enantiomers of chiral molecules [8,9]. Still within the one-body scenar...

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Section: Rotationally Cold Molecular Ionsmentioning

confidence: 99%

Quantum control of molecular rotation

2019

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“…In particular, the rotation of the molecular ions has been considered mostly with respect to a coupling with an external laser field. 15,[24][25][26] In this paper, we study the dynamical behavior of a rigid, heteronuclear diatomic molecular ion trapped inside a linear Paul trap. We investigate the coupling of the permanent dipole moment of the molecular ion with the trapping electric field and its effect on the rotational dynamics of the ion and also on the center-of-mass (COM) motion of the ion.…”

Section: Introductionmentioning

confidence: 99%

Rotational dynamics of a diatomic molecular ion in a Paul trap

Hashemloo

Dion

2015

The Journal of Chemical Physics

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We present models for a heteronuclear diatomic molecular ion in a linear Paul trap in a rigidrotor approximation, one purely classical and the other where the center-of-mass motion is treated classically, while rotational motion is quantized. We study the rotational dynamics and their influence on the motion of the center-of-mass, in the presence of the coupling between the permanent dipole moment of the ion and the trapping electric field. We show that the presence of the permanent dipole moment affects the trajectory of the ion and that it departs from the Mathieu equation solution found for atomic ions. For the case of quantum rotations, we also evidence the effect of the above-mentioned coupling on the rotational states of the ion. C 2015 AIP Publishing LLC. [http://dx

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Communication: Substantial impact of the orientation of transition dipole moments on the dynamics of diatomics in laser fields

Badankó

Halász

Cederbaum

et al. 2018

The Journal of Chemical Physics

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The formation of light-induced conical intersections (LICIs) between electronic states of diatomic molecules has been thoroughly investigated over the past decade. In the case of running laser waves, the rotational, vibrational, and electronic motions couple via the LICI giving rise to strong nonadiabatic phenomena. In contrast to natural conical intersections (CIs) which are given by nature and hard to manipulate, the characteristics of LICIs are easily modified by the parameters of the laser field. The internuclear position of the created LICI is determined by the laser energy, while the angular position is given by the orientation of the transition dipole moment (TDM) with respect to the molecular axis. In the present communication, using MgH+ as a showcase example, we exploit the strong impact of the orientation of the TDMs exerted on the light-induced nonadiabatic dynamics. Comparing the photodissociations induced by parallel or perpendicular transitions, a clear signature of the created LICIs is revealed in the angular distribution of the photofragments.

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Femtosecond wavepacket interferometry using the rotational dynamics of a trapped cold molecular ion

Cited by 4 publications

References 16 publications

Quantum control of molecular rotation

Quantum control of molecular rotation

Rotational dynamics of a diatomic molecular ion in a Paul trap

Communication: Substantial impact of the orientation of transition dipole moments on the dynamics of diatomics in laser fields

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