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3 Optica Applicata

3 2006

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The E2 admixture in mixed multipole line 647.6 nm in the spectrum of Bi I

Werbowy S, Kwela J

Optica Applicata

2006

Vol. 36, nr 4

s. 535--541

A study of the hyperfine structure of mixed multipole line 646.7 nm of Bi I is reported. A special computer program was designed to obtain the predicted contour of the hyperfine structure of the line for different values of the electric-quadrupole admixture. By variation of free parameters, describing the line shape and the electric-quadrupole admixture D, defined as the ratio of the magnetic-dipole and electric-quadrupole decay rates D = AE2/(AM1 + AE2), the calculated profiles were fitted into the recorded spectra. The D value of the best fit found is (17.8 ± 1.0)%. Our result is compared with recent theories and other experiments.

Stark effect in He I in extremely high electric field

Windholz L, Drozdowski R, Wasowicz T J, Kwela J

Optica Applicata

2006

Vol. 36, nr 4

s. 569--574

In the spectral range between 480–630 nm the Stark effect of the transitions n1Q–21S, n1Q–21P and n3Q–23P (n = 3–10, Q = S, P, D, ...) was studied in atomic helium using electric field up to 1500 kV/cm. For such an extremely high field the Stark splitting becomes greater than the simple structure of the atom. In consequence, anticrossings of the Stark components of the same magnetic quantum number occur. The experimental results have been compared with the theoretical shifts. The results of calculations show good agreement with observation not only for low field values, but also for those in high fields and in the case of level anticrossings.

Hyperfine structure and isotope shifts in 461.9 nm forbidden line of Pb I

Wasowicz T J, Drozdowski R, Kwela J

Optica Applicata

2006

Vol. 36, nr 4

s. 529--533

Studies of the hyperfine structure and the isotope shifts in the 461.9 nm (1S0–3P1) magnetic-dipole line of Pb I are presented. As a light source the electrodeless discharge tube was used. The high resolution spectral apparatus consisted of a silver coated Fabry–Perot etalon and a grating spectrograph combined with a CCD camera used as a detector. In the analysis of the spectra a computer simulation technique was used. The experiments with the isotope 207Pb yielded the hyperfine structure splitting constant A for the 3P1 level of the 6s26p2 ground configuration. In the experiment with natural lead the isotope shifts between four stable isotopes (204, 206, 207, 208) were measured.