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In ha1 tsii bersichtMit Hilfe der Doppelresonanzmethode wurden Hochfrequenziibergange in der Hyperfeinstruktur (im folgenden Hfs) des angeregten 7 2P3,2-Terms des Cs I-Spektrums nachgewiesen l). Die Messungen wurden an einer 0,2 mC-Probe eines Spaltproduktes durchgefiihrt, das die radioaktiven Isotopeii Cs1= und Cs13' sowie das stabile Reinisotop Cs 133 in annahernd gleicher Haufig-8) Die Jenaer Glaswerlre Schot,t 11. Ucn., hkinz, stellten freundlicherweisc allialifcstcs Glas SM 157 zur Verfiigung.

Resonance scattering of light as function of magnetic field has been used to investigate the hyperfine structure of the 4p 2P3/2and 5p zP3/z-terms in the potassium/-spectrum, 40 using a sample enriched in the K -isotope. With increasing magnetic field strength a structure containing two characteristic signals for K 4~ was observed. Taking into account the small ratio of hypeffine structure splitting to radiation width, these signals could be interpreted as an overlapping of three level-crossings. The line shape and magnetic field strength of these signals can be understood by taking for the magnetic interaction constants A 4~ (4p 2P3/2) ~--- (--7.59 + 0.06) Mc/s, A 40 (5 p 2P3/2) --( ~ 2.45 + 0.02) Mc/s and the electric quadrupol coupli-'ng constants B4~ 2P a/2)= (--3.5 ~-0.5) Me/s, B4~ 2P3/2)=(--1.1 + 0.2)Mc/s using gj=4/3. The values of B]A yield with Sternheimer corrections for the nuclear electric quadrupolmoment Q(K4~ --0.07 9 10 -24 cm 2. Einleitung