Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 15: Ultra-cold atoms, ions and BEC II (with Q)

A 15.5: Vortrag

Dienstag, 24. März 2015, 15:30–15:45, C/HSW

Photoassociation of Chromium — •Jahn Rührig, Tobias Bäuerle, Axel Griesmaier, and Tilman Pfau — 5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, Stuttgart, 70569 , Germany

We report the homonuclear photoassociation (PA) [1] of 52Cr atoms while demagnetization cooling [2] in an optical dipole trap. This constitutes the first measurement of PA in an high spin element. Although Cr, with the 7S3 ground and 7P3 excited states, is expected to have a complicated PA spectrum the spin polarized cloud, the applied σ light and the absence of hyperfine-splitting lead to a remarkably simple PA spectrum. Within the scan range of 20 GHz we observe two distinct PA series each following a LeRoy-Bernstein law [3] with excellent agreement. We determine the C3 coefficients of the Hund’s case c) [4] adiabatic potentials to be 1.9 a.u. and 1.5 a.u.. Due to the strong spin orbit coupling we compute the full adiabatic potentials [5] to explain the observed C3 coefficients. In a different set of experiments we can lift the spin-polarization of the cloud by tilting the magnetic field which leads to additional PA series.

[1]:K. M. Jones, Rev. Mod. Phys. 78, 483-535 (2006)

[2]:M. Fattori et al. , Nature Physics 2, 765 (2006).

[3]:R. J. LeRoy et al., J. Chem. Phys. 52, 3869 (1970).

[4]:F. Hund, Zeitschrift für Physik 36, 657-674 (1926).

[5]:M. Movre et al.,J. Phys. B: At. Mol. Phys. 10, 2631 (1977).

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