Untersuchung des 4 p 2 P 3/2- und 5p 2 P 3/2-Terms desKI-Spektrums durch Resonanzstreuung von Licht zur Bestimmung des Kernquadrupolmoments von K40

Abstract

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

Steady-State Nuclear Double-Resonance Detection of Electric Quadrupole Moment ofK40

“…The ratio of Q 40 to Q 3Q is plotted in Fig. 2 as a function of r\ for each of the This result confirms the recent measurement of Ney et al, 5 who performed a resonance-scattering experiment in potassium vapor enriched with K 40 and found after correcting for Sternheimer shielding that Q 40 = -0.07x 10"" 24 cm 2 . The above results also allow us to obtain a value of 3.9 x 10 u in esu units for eq.…”

“…Furthermore, a large enough rf field for optimum signals was not available. We obtained an accurate value for the ratio Q 40 /Q 39 and from this found a value for Q 40 in excellent agreement with that of Ney et al 5 One must note with some surprise the fact that signals from K 39 nuclei observed at I and i of the K 39 -resonance frequency overlap signals from K 40 nuclei near 235 and 175 kHz. The evidence clearly indicates that this is only a coincidence.…”

Dependence of the shapes of nonzero-field level-crossing signals in rubidium atoms on the laser frequency and power density

“…Furthermore, the density matrices computed with the theoretical model can shed light on the coherent processes associated with the excitation of the atoms, which is useful for computing fluorescence intensities for arbitrary directions and polarizations. Although the atomic constants involved in the transitions of the D 2 line of rubidium are well known, a precise model of level-crossing signals can be necessary for extracting atomic constants in situations where the large number of level crossings washes out individual peaks or where the hyperfine splitting is small [24]. The utility of such a model for the hyperfine constants A for the 7,9,10D 5/2 states of cesium from electric-field level crossings was demonstrated, for example, in [25].…”

Experimental determinations of the hyperfine structure in the alkali atoms

“…4&q~z. There is a level-crossing measurement by Ney et al (1968), yielding A. = -7.59(6}; B= -3.5(5) MHz.…”