The magneto-optical absorption spectroscopy experiments on thallium, copper and silver are presented. The experimental setup and the method of analysis. are described. The data were acquired utilizing the linearly polarized light emitted by the 2.5 GeV electron accelerator, a 6 Tesla superconducting magnet, and a 3-meter high dispersion spectrograph with the photographic detection.
The magneto-optical absorption spectra of thallium were recorded in the wavelength range from 2020 A to 2090 A. Measurements of oscillator strengths (relative f-value) for the principal series of thallium
6s2 6p 2p1/2 â†’ 6s2 nd 2D3/2 (12 â‰¤ n â‰¤ 24)
6s2 ns 2S Â½ (14 â‰¤ n â‰¤ 23)
are reported. A quantum defect plot of the density of oscillator strengths of discrete transitions in thallium yields the photoionization cross section at the threshold as 1.68 Â± 0.15 Mb for the s-series and 7.77 Â± 0.23 Mb for the d-series.
In case of copper, the magneto-optical absorption spectra are reported in the wavelength range 1600 A - 1850 A. The oscillator strengths for the transitions
3d10 4s 2S1/2 â†’ 3d10 np 2Pl/2 (7 â‰¤n â‰¤13)
3d10 4s 2S1/2 â†’ 3d10 np 2P3/2 (7 â‰¤n â‰¤23)
have been measured, and comparison with the earlier work has been reported. The quantum defect plot of the density of oscillator strength of the discrete transition has been plotted and compared with the alkali atoms.
The magneto-optical absorption spectra of silver are reported in the wavelength range of 1630 A to 1730 A. This wavelength range includes the electric dipole transitions:
4d10 5s 2S1/2 â†’ 4d10 np 2P1/2,.3/2 (9 â‰¤ n â‰¤ 23)
3d10 4s 2S1/2 â†’ 3d9 5s5p 4P1/2,.3/2
The oscillator strengths for the above transition have been measured. The quantum defect plot of the density of oscillator strengths of the discrete transitions has been plotted.