Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster III

A 26.58: Poster

Donnerstag, 17. März 2011, 16:00–18:30, P2

Comparison between measurements of hyperfine structures of Pr II - lines investigated by collinear laser ion beam spectroscopy (CLIBS) ans saturation spectroscopy — •Nadeem Akhtar1,2, Naveed Anjum1,2, Harry Hühnermann1,3, and Laurentius Windholz11Inst. f. Experimentalphysik, Techn. Univ. Graz, Petersgasse 16, A-8010 Graz — 2Optics Labs, Nilore, Islamabad, Pakistan — 3Fachbereich Physik, Univ. Marburg/Lahn

Investigation of narrow hyperfine structures needs a reduction of the Doppler broadening of the investigated lines. Here we have used two methods: collinear laser spectroscopy (CLIBS) and laser saturation spectroscopy. In the first method, the Doppler with is reduced by accelerating Pr ions to a high velocity and excitation with a collinear laser beam, while in the second method ions with velocity group zero are selected by nonlinear saturation.

In this work the hyperfine spectra of several Pr II lines were investigated using CLIBS. A line with of ca. 60 MHz was measured. The same lines were then investigated in a hollow cathode discharge lamp using intermodulated laser-induced fluorescence spectroscopy. Using this technique a spectral line width of about 200 MHz was achieved. In both methods, the excitation source is a ring dye laser operated with R6G. Using a fit program, magnetic dipole interaction constants A and the electric-quadrupole interaction constants B of the involved levels have been determined in both cases. We discuss advantages and disadvantages of both methods.

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