# MAGNETIC CIRCULAR DICHROISM STUDY OF SPIN-ORBIT SPLITTING IN ALKALI DIMERS IN THE PRESENCE OF A HELIUM SURFACE

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 Title: MAGNETIC CIRCULAR DICHROISM STUDY OF SPIN-ORBIT SPLITTING IN ALKALI DIMERS IN THE PRESENCE OF A HELIUM SURFACE Creators: Aubock, Gerald; Nagl, Johann; Callegari, Carlo; Ernst, Wolfgang E. Issue Date: 2008 Abstract: We present the application of Magnetic Circular Dichroism (MCD) to the determination of the level structure of orbitally-degenerate electronic levels of molecules under the perturbation of a He droplet, which had so far escaped assignment. Our target system is the $(1)\,^{3}\Pi_g$ [$(2)\,^{3}\Pi$ if heteronuclear] manifold of alkali dimers.} \textbf{111,} 7404 (2007).} The perturbation due to the droplet breaks the rotational symmetry around the internuclear axis of the diatom and causes a splitting of this orbitally-degenerate manifold. We extend to He droplets a model previously used to interpret the matrix spectra of the NH radical.} \textbf{2415,} 102 (1998).} With a small number of physically reasonable parameters the model accounts for the essential features of laser-induced fluorescence (LIF) and magnetic circular dichroism (MCD) spectra of \chem{Rb_2} and \chem{K_2}. MCD spectra are not only essential to the correct assignment of the observed structure, but also allow a determination of the populations of Zeeman sublevels in the ground state and thus a measurement of the surface temperature of the droplet. The latter agrees with the accepted temperature, 0.37 K, measured in the interior of a droplet. URI: http://hdl.handle.net/1811/33338 Other Identifiers: 2008-WH-10