The spectrum of trebly-ionized lead, Pb IV

Abstract

Carroll, Smith, Rao and Narayan and Schoepfle have established terms of the one-electron configurations of Pb IV. Schoepfle, whose analysis is the most complete, has identified the 6 s , 7 s , 8 s , 6 p 7 p , 6 d , 7 d , 5 f doublets, and in addition assigned a number of terms to the many-electron configurations that have as limit the 5 d 9 6 s configuration of Pb V. The Au I iso -electronic sequence, especially the configurations involving the 5 d 9 core, has been under investigation in this laboratory for some time. The analysis of Au I and of Hg II have been published and that of Pb IV is presented here. The investigation of Tl III is practically completed and will be published soon; Bi V is partially analysed. The state of our work on Tl III and Bi V is mentioned here because certain terms of these spectra and the corresponding terms of Pb IV have been established mainly by the regularity of the Moseley curves for these terms throughout the sequence Au I to Bi V. Thus the analysis of one spectrum has been facilitated and confirmed by a knowledge of the others. It is certain that some of the terms of Pb IV would not have been found except by such a method.

Изотопический Эффект В Атомных Спектрах

“…Обширные данные по изотопическому смещению в линиях и термах свинца собраны для РЬI и РЬ Ц180-Ю4, р Ь щаяв и РЬIV 186 , которые в обобщённом виде даны в таблицах Брикса и Копфермана 12 . В термах свинца проявляются те же закономер- Большое внимание за последние годы было уделено исследо-ванию изотопического смещения в спектрах элементов редкозе-мельного ряда.…”

Theoretical transition probabilities, oscillator strengths, and radiative lifetimes of levels in Pb IV

“…In this previous work we used relativistic Hartree-Fock (HFR) calculations to obtain the oscillator strengths, but no core-polarization effects were included in these calculations. The Pb IV spectrum was studied earlier in the range from 200 to 9000 Á by Schoepfle [5] and Crawford et al [6]. Analyses of transitions from the autoionizing states 5d 9 6s nf (n = 5,6,7) to the 5d 10 6s 2 S 1/2 in Pb IV have also been reported [7,8].…”

Experimental Stark widths in the Pb IV and Pb V spectra

“…We found that the Table 2). Transitions are taken from Crawford et al (1937) and Gutmann (1969). intensity ratios of the Pb IV spectral lines are constant (within 14%) during the plasma decay.…”

“…A pulsed discharge was created in a glass discharge tube of 5 mm inner diameter with a plasma length of 14 cm (see Fig. 1 Zaidelj et al (1977) not classified by ionization stages, while (Craw) is the abbreviation for Crawford et al (1937) and (Smith) for Smith (1930). of the plates provides uniform distribution of the sputtered Pb atoms along the optical axis of the homogeneous part of the discharge. The length of the cylindrical plates is 20 mm.…”

“…Only few experiments (Smith 1930;Crawford et al 1937;Gutmann 1969Gutmann , 1973 are devoted to the Pb IV spectrum investigation at wavelengths higher than 200 nm. For the Pb V spectrum only one experiment (Gutmann 1969(Gutmann , 1973 refers to the identified Pb V spectral lines.…”