Abstract book - Prof. Per Jensen, Ph.D. - Bergische Universität ...

62 Poster session, D15High-L atomic Rydberg states of alkali metals studied by highresolution time-resolved Fourier-transform infrared spectroscopySvatopluk Civiš, Martin Ferus, Petr Kubelík, Vladislav E. Chernov,Ekaterina M. ZanozinaJ.Heyrovský Institute of Chemical Physic, Praha 8, Dolejškova 3, 18200,Czech Republic, zanozina@triniti.ruCivis S.Ferus M.Kubelik P.Chernov V.E.Zanozina E.M.Here is shortly reported a study focused on time-resolved spectra arising from 193 nmpulsed laser ablation of alkali metal and metal oxides targets in a 10 -3 Torr vacuum. Wereport IR spectra of several alkali metal atoms in the 800–8000 cm -1 region. For themeasurement of the time resolved Fourier-transform infrared spectroscopy (FTIR)spectra the synchronous continuous scanning method was used. After each ArF lasertrigger point several data points was sampled while the interferometer's mirror movedcontinuously. To couple this method with a laser ablation as a source of the registeredemission requires a special instrumental approach 1 .The infrared emission spectra of Na, K, Rb and Cs resulting from the laser ablation oftargets performed as alkali metal salts (NaI, NaBr, KCl, KBr, KF, KI, RbCl, CsCl andCsI) tablets in a vacuum was recorded using time-resolved Fourier-transformspectroscopy in the 800–1000, 1000–1200, 1200–1600, 1800–3600, 4100–5000 and5200–7500 cm -1 ranges with a resolution of 0.02 cm -1 . We report 17 lines of Na, 26 ofK, 24 of Rb and 21 of Cs. The measured Na and K lines are in agreement with the solarspectra recorded in Atmospheric Chemistry Experiment (ACE).The line classification is performed using relative line strengths expressed in terms oftransition dipole matrix elements calculated with the help of the single-channel quantumdefect theory (QDT) 2 . We show the results for the transition probabilities and oscillatorstrengths for transitions between the reported atomic metal states. For the classificationof the observed IR lines, an important role is played by the f-, g- and h-states includingthose discovered in the present measurements. For all the elements considered, the mostintensive emission line in the 800–1000 cm -1 and 1200–1600 cm -1 region correspond tothe 6g–7h and 5g–6h transitions respectively.From the lines observed we extract revised energy values for more than 150 energylevels (uncertainty 0.01–0.03 cm -1 ) of which 1 level of K, 3 of Na, 4 of Rb and 2 of Csare reported for the first time.References[1] S. Civiš, I. Matulková, J. Cihelka, P.Yu. Buslov and V.E. Chernov, Phys. Rev. A,81, 012510, 2010[2] V.E. Chernov, D.L. Dorofeev, I.Yu. Kretinin and B.A. Zon, Phys. Rev. A, 75,022505, 2005