Journal de physique

Optical pumping and g-factor of the 3P0 state of the first excited configuration of rare gases odd isotopes

F. Sage, D. Lecler

Published Jan 1, 1985• 8 citations

Abstract

Metastable np5(n + 1)s 3P0 (1s3 in Paschen notation) atoms of odd isotopes of neon, krypton and xenon have been optically pumped in a beam of metastable atoms by means of a C.W. single-mode dye laser. A magnetic resonance experiment leads to the determination of the g-factor of the 3P0 state : 3.02(2) x 10-4 for 21Ne; 0.974(4) × 10-4 for 83Kr; 7.781(2) x 10-4 for 129Xe and - 2.305(1) x 10-4 for 131Xe. These results are compared with theoretical predictions.

DOI: 10.1051/jphys:01985004604054500

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Journal de physique

Optical pumping and g-factor of the 3P0 state of the first excited configuration of rare gases odd isotopes

F. Sage, D. Lecler

Published Jan 1, 1985• 8 citations

Publisher

Abstract

DOI: 10.1051/jphys:01985004604054500

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Journal de physiqueJan 1, 198030 citations

We have magneto-optically trapped the nine stable isotopes of xenon. Using the Zeeman slowing method to decelerate a beam of xenon atoms in the metastable 6s 3/2 [3/2

{]}_{2}

state (notation representing nl

{\mathit{J}}_{\mathrm{core}}

[K=

{\mathit{J}}_{\mathrm{core}}

{]}_{\mathit{J}}

), we load our trap to a collisionally limited density of more than

{10}^{10}

atoms/

{\mathrm{cm}}^{3}

. The two odd isotopes are trapped without a repumping frequency, even though they have hyperfine structure. The sensitivity of the trapping process to the laser frequency is exploited to make accurate measurements of the isotope shifts for the 6s 3/2 [3/2

{]}_{2}

\ensuremath{\rightarrow}6p 3/2 [5/2

{]}_{3}

laser-cooling transition and of the hyperfine constants for

^{131}\mathrm{Xe}

We demonstrate an experimental technique that selects the nuclear spin I=0 isotope

^{138}\mathrm{Ba}

for spectroscopic measurements from a beam of natural barium containing seven stable isotopes. A cw dye laser is used to optically pump the I=3/2 isotopes

^{135}\mathrm{Ba}

and

^{137}\mathrm{Ba}

into the metastable 6s5d

^{1}

{\mathit{D}}_{2}

and

^{3}

{\mathit{D}}_{1,2}

levels via the 6s6p

^{1}

{\mathit{P}}_{1}

excited state, leaving nearly pure

^{138}\mathrm{Ba}

in the ground state. Photoionization spectra of the excited 5d6p

^{3}

{\mathit{D}}_{1}

even isotope state recorded with optical pumping of

^{135}\mathrm{Ba}

and

^{137}\mathrm{Ba}

to the metastable levels are essentially devoid of forbidden features associated with the hyperfine interaction in the odd isotopes.

High Rydberg levels of ytterbium were studied in a beam of metastable atoms. Levels of the series 4f

^{14}

sn

d were populated from the metastable 4f

^{14}

6s 6p

^3

_o

level by means of the U.V. light of a frequency-doubled single-mode dye laser and detected using the field ionization technique. The critical ionization fields

F_c

of the levels 4f

^{14}

sn

^3

_1

(24 ≤ n ≤ 57) were measured and found to obey the saddle point law (

F_c

= (16

n^{*4}

)

^{-1}

). The hyperfine structures of the odd isotopes were investigated. They are very peculiar due to the fact that the hyperfine interaction is of the same order of magnitude as (or even for the highest

n

values, much more important than) the spin-orbit and electrostatic interactions. A theoretical account of the observed structures using the Slater-Condon parametric method is given. The relative influence of the excited (

n

d) and of the non-excited (6s) optical electron could thus be studied. Furthermore the influence of a valence level perturbing only the odd isotopes components for

n

= 26 was demonstrated.