Ultrafast manipulation of the weakly bound helium dimer

  title={Ultrafast manipulation of the weakly bound helium dimer},
  author={Maksim Kunitski and Qingze Guan and Holger Maschkiwitz and J{\"o}rg Hahnenbruch and Sebastian Eckart and Stefan Zeller and Anton Kalinin and Markus S. Sch{\"o}ffler and Lothar Ph. H. Schmidt and Till Jahnke and D{\"o}rte Blume and Reinhard D{\"o}rner},
  journal={Nature Physics},
Controlling the interactions between atoms with external fields opened up new branches in physics ranging from strongly correlated atomic systems to ideal Bose1 and Fermi2 gases and Efimov physics3,4. Such control usually prepares samples that are stationary or evolve adiabatically in time. In contrast, in molecular physics, external ultrashort laser fields are used to create anisotropic potentials that launch ultrafast rotational wave packets and align molecules in free space5. Here we combine… 
3 Citations
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Gently stirred not shaken
  • D. Rolles
  • Physics, Chemistry
    Nature Physics
  • 2020
Manipulating weakly bound helium dimers with ultrafast laser pulses reveals their quantum behaviour. This method opens a route towards studying the low-energy dynamics of other exotic and fragile


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A field-dependent value of angular momentum can be imparted to a 4 He 2 cluster by the interaction of its anisotropic polarizability with a nonresonant laser field. In this way a centrifugal term is
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Calculations indicate that 15 and 1.5 ns laser pulses of an intensity in excess of 5 x 10(9) W/cm(2) are capable of dissociating the molecule due to the vibrational shift, which can be used to fine-tune the rovibrational levels and thereby affect collisional resonances by the nonresonant light.
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We review the theoretical and experimental status of intense laser alignment---a field at the interface between intense laser physics and chemical dynamics with potential applications ranging from
Feshbach resonances in ultracold gases
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Probing weakly bound molecules with nonresonant light.
Numerical simulations applied to the Rb(2) and KRb Feshbach molecules indicate that shaking by feasible laser pulses can be used to accurately recover the square of the vibrational wave function and, by inversion, also the long-range part of the molecular potential.