Search

The emission spectrum of ^209Bi has been observed in the infrared region using a Fourier-transform spectrometer at Laboratoire Aimé Cotton, Orsay, using a microwave-excited discharge tube as the light source. In this paper, we report the identification of the 5ƒ–;5g, 5ƒ–;6g, 5ƒ–;7g, and 5ƒ–;8g transitions. We have also located the 6d–;5ƒ, 6d–; 6ƒ, 6d–;7ƒ, 6d–;8ƒ, 6d–;9ƒ, 7d–;6ƒ, 7d–;7ƒ, 7d–;8ƒ, and 7d–;9ƒ transitions. Using the ƒ–g transitions, we have recalculated the ionization limit of bismuth to be 58 760 ± 1 cm^−1.

The spectrum of neutral bismuth has been studied in the infrared region by means of the Fourier-transform spectrometer at the Laboratoire Aimé Cotton, Orsay, France. A microwave-excited discharge tube containing bismuth iodide was used as the light source. A total of 37 hyperfine structures was studied. Precise measurements of the center of gravity of the structures give energy levels with an error less than 0.005 cm^−1. Complete analysis of these hyperfine structures resulted in the determination of the magnetic-dipole and the electric-quadrupole interaction constants for 10 even and 12 odd levels. The present results have increased the number of newly classified lines to 78, as compared with 28 reported in our earlier work [ J. Opt. Soc. Am.72, 589 ( 1982)]. The analysis has also resulted in the confirmation and the assignment of many J values, improved values of energy levels, and two new levels.

New uranium hollow-cathode Fourier-transform spectra have been recorded between 1800 and 42 000 cm^-1. Combined with earlier visible and ultraviolet spectra, these have led to 354 odd levels and 809 even levels of singly ionized uranium (U II) belonging to four odd and six even configurations. High-resolution Fourier-transform spectra of an electrodeless discharge lamp containing ^238UI_4 and ^234UI_4 were used to measure splittings of more than 800 isotopic U II doublets to an accuracy of ~0.001 cm^-1. From these transition isotope shifts 114 odd- and 397 even-level isotope shifts were determined.

The spectrum of neutral ^121Sb emitted by an electrodeless discharge lamp has been observed in the range 2 536–24 786 cm^−1. The wavelengths of 617 lines have been measured. The hyperfine-structure splitting factors of the levels were established for 77% of these lines. Thirty-two new energy levels were found, and several J values were revised. The Slater–Condon method was used for the interpretation of levels in both parities, and the multiconfiguration eigenfunctions were applied to the parametric study of the hyperfine-structure factors A and B. The multichannel quantum-defect theory analysis of high odd levels having J = 1/2 and J = 3/2 was also revised.

The emission spectrum of ^209Bi has been observed in the infrared region using a Fourier-transform spectrometer at Laboratoire Aimé Cotton, Orsay, using a microwave-excited discharge tube as the light source. In this paper, we report the identification of the 5f–5g, 5f–6g, 5f–7g, and 5f–5g transitions. We have also located the 6d–5f, 6d–6f, 6d–7f, 6d–8f, 6d–9f, 7d–6f, 7d–7f, 7d–8f, and 7d–9f transitions. Using the f–g transitions, we have recalculated the ionization limit of bismuth to be 58 760 ± 1 cm^−1.

The spectrum of neutral ^121Sb emitted by an electrodeless discharge lamp has been observed in the range 2 536–24 786 cm^−1. The wavelengths of 617 lines have been measured. The hyperfine-structure splitting factors of the levels were established for 77% of these lines. Thirty-two new energy levels were found, and several J values were revised. The Slater–Condon method was used for the interpretation of levels in both parities, and the multiconfiguration eigenfunctions were applied to the parametric study of the hyperfine-structure factors A and B. The multichannel quantum-defect theory analysis of high odd levels having J = ½ and J = 3/2 was also revised.