Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 9: Precision Spectrosocopy II - trapped ions (joint session A/Q)

A 9.2: Hauptvortrag

Montag, 5. März 2018, 14:30–15:00, K 1.016

Towards laser cooling of atomic anions — •Alban Kellerbauer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

Currently available cooling techniques for negatively charged particles allow cooling only to the temperature of the surrounding environment, typically a few kelvin. Laser cooling of atomic anions could be used to produce an ensemble of negative particles at microkelvin temperatures. These could sympathetically cool any species of negatively charged particles – from antiprotons to molecular anions – to ultracold temperatures. For this indirect cooling technique [1], a fast electronic transition is required. Until now, there are only three known atomic anions with bound–bound electric-dipole transitions. We have investigated these transitions in Os⁻ [2] and La⁻ [3] by high-resolution laser spectroscopy to test their suitability for laser cooling. The principle of the method, its potential applications, as well as recent experimental results will be presented.

[1] A. Kellerbauer & J. Walz, “A novel cooling scheme for antiprotons”. New J. Phys. 8 (2006) 45. doi:10.1088/1367-2630/8/3/045.

[2] U. Warring et al., “High-resolution laser spectroscopy on the negative osmium ion”. Phys. Rev. Lett. 102 (2009) 043001. doi:10.1103/PhysRevLett.102.043001.

[3] E. Jordan et al., “High-resolution spectroscopy on the laser-cooling candidate La⁻”. Phys. Rev. Lett. 115 (2015) 113001. doi:10.1103/PhysRevLett.115.113001.