In order to determine the nuclear quadrupol moments of the stable K-isotopes, the hypeffine structure of the 4p and 5p 2P3/z-states was investigated by resonance scattering of light. The scattered intensity R(H) from separated isotopes in a sealed off resonance cell, as function of an external magnetic field H was observed with different polarisations (a-and ~r-components perpendicular to H) both in exciting and scattered light. Because the hfs-splitting of the investigated states is comparable to the radiation width F, the measured change in intensity AR(H)[AH is due to interference effects (Hanle-effect, level-crossing, anti-crossing) and decoupling of electronic and nuclear spin (Heydenburg-effect). The different effects are not distinguishable in contrary to an usual level-crossing experiment and therefore the measured signal-structure is compared with line shape calculations according to BreWs-formula. Assuming "white" excitation and gs=4/3, the measured signal-structure can be explained with the following values:F/2~r (4p)= 5.7 (4) MHz Without Sternheimer corrections one obtains from these values Q (K39)= 0.062.10 -24 cm 2 and Q(K41)=0.076 9 10 -24 cm 2 for the electrical nuclear quadrupolmoments of K 39 and K 41.
The level-crossing technic has been used to investigate the hyperfinestructur of the 3d 1~ 4p 2p~-term in Copper I by scattering the resonance line 2= 3248 A on an atomic beam of separated isotop Cu 63 respectively Cu 6s in an external magnetic field. With the A-value of the 3d 1~ 4p 2ps from optical measurements 1 the ratio A (2pff): A (2P~t) ~ 0,4 is about twice greater than for an unperturbet alkali-like 2p-term. From the width of the level-crossing signals a mean lifetime of the 3 d 1~ 4p 2P~-term ~=(7,0-t-0,2). 10 -9 sec is deduced.
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
The hyperfine structure of the excited 3d 9 4s 4p 4pk-term of the Cu I-spectrum was investigated in a level-crossing experiment using an atomic beam with copper in natural abundance as absorber. From the level-crossing signals the following relations for the hyperfine structure constants were deduced*
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