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Münster 1999 – wissenschaftliches Programm

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CP: Chemische Physik

CP 26: Poster: Spektroskopie

CP 26.7: Poster

Montag, 22. März 1999, 18:00–20:00, R52/R72

Fluorescence from ionic excimer states of alkalihalides in solid Ne and Ar films — •G. Śliwiński1, M. Frankowski1, and N. Schwentner21Pol. Acad. Sci., IF-FM, Fiszera 14, PL 80-952 Gdańsk — 2Institut für Experimentalphysik, FU Berlin, Arnimallee 14, D-14195 Berlin

The electronic shell configurations of alkalihalide ions (A+X) correspond to those of rare gas halides RgX in the ground state and the charge transfer states (A2+X) are isoelectronic to (Rg+X) exciplex states with similar potential surfaces. The alkalihalide ionic systems A2+X are promissing for an extension of the solid state excimer lasers towards shorter wavelengths. Pulsed e-beam excitation of solid Ne and Ar films doped with 0.4 to 0.6 % (AX) leads to fluorescence in the VUV and deep UV region. The A2+X states are efficiently populated by ionisation of the trapped AX molecules via Rg excitons. The B2Σ→ X2Σ and C2Π→ A2Π bands of Cs2+F (196.5 nm, 227 nm), Cs2+Cl (220.1 nm, 249.2 nm) and Rb2+F (136 nm) in Ne, and a weaker (B-X) emission of Cs2+F (211.2 nm) in Ar are identified, respectively. The ratio of recorded intensities I(CsF)/I(CsCl)/I(RbF) = 20/5/1 reflects the energy transfer efficiency. For RbF and CsCl a competitive emission channel due to pre-dissociation in the B2Σ state is observed. An efficient formation of X2 molecules (RbF, CsCl) is confirmed through recording the molecular D(3Π2g) - A(3Π2u) transition. A strong quenching occurs at doping concentrations higher than 0.7%.

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