We report the first measurements of the even-parity J = 1 and 2 levels of neutral tin using a two-step laser excitation technique in conjunction with an atomic beam apparatus. The Rydberg series 5pnp (1/2,3/2)2 (11 n45) and 5pnp (1/2,3/2)1 (12 n18) have been observed converging to the first ionization limit. In addition, five p-levels; 5p8p (3/2,1/2)1,2, 5p8p (3/2,3/2)0,1,2 and three f-levels 5p5f (3/2,5/2)1,2 and 5p5f (3/2,7/2)2 converging to the second ionization threshold have been identified. The perturbations among the J = 2 levels have been studied using three-channel quantum defect theory.
We report here first measurements of the odd-parity 6p 3/2 ns J = 1, 2 and 6p 3/2 nd J = 0, 1, 2, 3 autoionizing Rydberg levels of lead using a three-step laser excitation scheme in conjunction with an atomic beam apparatus. Four initial levels 6p 3/2 7p 1/2,3/2 J = 1, 2 were chosen for the excitation of the final levels. The assignments have been made using the j 1 K-coupling scheme for the observed levels. The Rydberg series 6pnd 3/2[1/2] 0,1 (13 n 38), 3/2[3/2] 2 (16 n 73), 3/2[5/2] 2,3 (13 n 37) and 3/2[7/2] 3 (16 n 39) as well as 6p 3/2 ns3/2[3/2] 1,2 (14 n 40) are reported. All the observed series exhibit constant quantum defects with respect to the ionization potential value 73 900.65 ± 0.05 cm −1 . The full widths at half the maximum of the observed levels are also reported.
In this paper we present the Rydberg autoionization spectra of lead from 73 000 cm −1 to the 6p 3/2 ionization limit at 73 900.65 cm −1 excited from the 6p7f and 6p8f 1 2 [ 5 2 ] 2 intermediate levels. Term energies and FWHM of 40 lower n levels (n = 10-15) of the 6p 3/2 nd, (n + 2)s J = 1-3 Rydberg series are reported for the first time.
New spectra of lead consisting of the autoionizing Rydberg energy region excited via the 6p6f 1 2 5 2 2 level is presented. Fifty levels along with their FWHM widths are reported. Eleven levels of the 6p 3/2 ng (6 n 12) configuration have been reported for the first time. Besides two unassigned levels with effective quantum number 8.446 and 10.86, five new levels of the 6p 3/2 9d configuration have been observed. An unexplained phenomenon is observed where the 6pns 3
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