g J -Faktoren der tiefsten3 P 1-Zustände von Strontium und Barium

Abstract

The gj-values of the lowest 3Pl-states of Sr and Ba have been determined with optical double resonance. The measurement has been carried out by observation of radiofrequency transitions Amj= 4-1 between Zeeman levels of the even isotopes. Calibration of the magnetic field has been done by optical pumping of the 32S~/2 ground state of the sodium atom. The results are: g~Xp (5 s 5 p aP1, Sr) = 1.50065 (4) g~Xp (6 s 6p aP 1, Ba) = 1.49651 (7).

Lifetimes andg J factors of 6s7p and 5d6p levels of Ba I

“…In the case of the 6s 7p configuration a further correction pertaining to the spin-other orbit interaction [20,25] can be evaluated numerically. The inclusion of this interaction improves the agreement between theory and experiment, similarly like in the 6s 6p configuration [10].…”

“…Small discrepancies in the 6s 7p 3P 1 level of (9__+5). 10 -4 are similar in size than in the 6s 6p 3P I state [10]. They presumably originate from neglecting diamagnetic and relativistic corrections, which cannot be calculated accurately because of the lack of precise radial wave functions.…”

“…The calibration of the magnetic field was achieved by observation of r f-transitions A ms= ___ 1 in the 6s 6p 3/01 state of Ba which yield strong and narrow (300 KHz) signals. For this state gs is known as gj= 1.49651 (7) [10]. The recording of this transition was taken as close as possible to the center of the resonance line to be measured.…”

On the electric nuclear quadrupole moments of135,137Ba

“…In order to clarify the situation, the original goal of obtaining information on the nucleus from the atomic hfs was then reversed towards the improvement of the understanding of the atom by studying its spectra and the interaction with its nucleus. Precise measurements of gs as well as ~ for both 1/]1 [5] and 3p~ [8][9][10] did not reveal any doubt about the coupling coefficients obtained from the fine structure. Remeasurements of the hfs confirmed the previous data [4].…”

Level-Crossing-Untersuching der Stark-Aufspaltung der tiefsten1 P 1-Terme von Ca, Sr und Ba

“…Um aus den gemessenen Verhiiltnissen ~ten/gs die tensoriellen Polarisierbarkeiten zu bestimmen, wurden die gs-Faktoren der 1P1-Terme aus den gemessenen gj-Faktoren der entsprechenden aP1-Terme [11][12][13] In einer Diskussion der Polarisierbarkeitskonstanten kann einerseits versucht werden, Aussagen tiber die Zustandsvektoren (speziell fiber die ortsabh/ingigen Anteile) der betrachteten Terme zu gewinnen. Der Zusammenhang zwischen der Polarisierbarkeit und dem Zustandsvektor eines Niveaus wird insbesondere aus einem yon Sternheimer [15] …”