Two-step laser excitation of the even-parity Rydberg levels of lead (original) (raw)
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Three-step laser excitation of the ?, ? J = 1, 2, 3 autoionizing Rydberg levels of lead
Journal of Physics B-atomic Molecular and Optical Physics, 1997
We report here first measurements of the odd-parity 0953-4075/30/5/013/img12 J =1, 2 and 0953-4075/30/5/013/img13 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 0953-4075/30/5/013/img14 J = 1, 2 were chosen for the excitation of the final levels. The assignments have been made using the 0953-4075/30/5/013/img15-coupling scheme for the observed levels. The Rydberg series 0953-4075/30/5/013/img16, 0953-4075/30/5/013/img17, 0953-4075/30/5/013/img18 and 0953-4075/30/5/013/img19 as well as 0953-4075/30/5/013/img20 are reported. All the observed series exhibit constant quantum defects with respect to the ionization potential value 0953-4075/30/5/013/img21. The full widths at half the maximum 0953-4075/30/5/013/img22 of the observed levels are also reported.
Spectrochimica Acta Part B: Atomic Spectroscopy, 2011
We report experimentally determined oscillator strength distribution in the bound region of lead corresponding to the 6p7s (1/2, 1/2) 1 → 6pnp (1/2, 3/2) 2 (20 ≤ n ≤ 52) Rydberg transitions. The absolute value of the photoionization cross section from the 6p7s (1/2, 1/2) 1 excited state at the first ionization threshold 6p ( 2 P 1/2 ) has been determined as 27± 4 Mb using the saturation absorption technique. The threshold value of the photoionization cross section is used to calibrate the oscillator strengths of the above mentioned Rydberg transitions. Moreover, oscillator strengths in the bound region smoothly connect with the differential oscillator strength density at the first ionization threshold, and verify the fundamental condition of quantum defect theory.
Journal of Physics B Atomic Molecular and Optical Physics
We report new experimental data on the even parity 5p [iopmath latex="$_{1/2} n$"] 1/2n [/iopmath] p and nf [iopmath latex="$J = 1$"] J = 1 [/iopmath] , 2 Rydberg series of tin excited from the 5p6s [iopmath latex="$(3/2,1/2)_1$"] (3/2,1/2)1 [/iopmath] intermediate level using a two-step laser excitation technique in conjunction with an atomic beam apparatus. The Rydberg series 5pnf [iopmath latex="$(1/2,5/2)_2$"] (1/2,5/2)2 [/iopmath] [iopmath latex="$(12\le n \le 46)$"] (12n46) [/iopmath] and 5pnp [iopmath latex="$(1/2,1/2)_1$"] (1/2,1/2)1 [/iopmath] [iopmath latex="$(20\le n \le 31)$"] (20n31) [/iopmath] are reported for the first time, whereas the 5pnp [iopmath latex="$(1/2,3/2)_2$"] (1/2,3/2)2 [/iopmath] [iopmath latex="$(16\le n \le 56)$"] (16n56) [/iopmath] series have been extended to higher principal quantum number. The previously reported three p levels, 5p8p [iopmath latex="$(3/...
Journal of Physics B: Atomic, Molecular and Optical Physics, 2001
We report new experimental data on the even parity 5p 1/2 np and nf J = 1, 2 Rydberg series of tin excited from the 5p6s(3/2, 1/2) 1 intermediate level using a two-step laser excitation technique in conjunction with an atomic beam apparatus. The Rydberg series 5pnf(1/2, 5/2) 2 (12 n 46) and 5pnp(1/2, 1/2) 1 (20 n 31) are reported for the first time, whereas the 5pnp(1/2, 3/2) 2 (16 n 56) series have been extended to higher principal quantum number. The previously reported three p levels, 5p8p(3/2, 3/2) 0,2 and 5p8p(3/2, 1/2) 2 , and three f levels, 5p5f(3/2, 5/2) 1,2 and 5p5f(3/2, 7/2) 2 , have also been detected. The inter-channel interaction among the 5pnf(1/2, 5/2) 2 and 5p5f(3/2, 5/2) 2 channels has been studied using a two channel quantum defect theory.
Three-step excitation of the ?, nd, ng autoionizing Rydberg levels via the 6p6f ? level of lead
Journal of Physics B-atomic Molecular and Optical Physics, 1997
New spectra of lead consisting of the autoionizing Rydberg energy region excited via the 0953-4075/30/19/010/img12 level is presented. Fifty levels along with their FWHM widths are reported. Eleven levels of the 0953-4075/30/19/010/img13 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 0953-4075/30/19/010/img14 configuration have been observed. An unexplained phenomenon is observed where the 0953-4075/30/19/010/img15 levels for n > 14 do not show up via the 0953-4075/30/19/010/img12 route in contrast to the fact they are observed as strong resonances when excited via other similar routes, namely, 0953-4075/30/19/010/img17 and 0953-4075/30/19/010/img18 levels.
Two-step laser spectroscopy of the even-parity Rydberg levels of neutral tin
Journal of Physics B: Atomic, Molecular and Optical Physics, 1999
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 n 45) and 5pnp ( 1 2 , 3 2 ) 1 (12 n 18) 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. 0953-4075/99/245669+11$30.00
Three step excitation of the ? autoionizing Rydberg levels via ? levels of lead
Journal of Physics B-atomic Molecular and Optical Physics, 1997
In this paper we present the Rydberg autoionization spectra of lead from 73 000 cm −1 to the 6p 3/2 ionization limit at 73 900.65 cm −1 excited from the 6p7f and 6p8f 1 2 [ 5 2 ] 2 intermediate levels. Term energies and FWHM of 40 lower n levels (n = 10-15) of the 6p 3/2 nd, (n + 2)s J = 1-3 Rydberg series are reported for the first time.
Journal of Physics B: Atomic, Molecular and Optical Physics, 2001
Landé g J factors and lifetimes for the levels in the even-parity Rydberg series 6pnp (n = 9-16) and 6pnf (n = 6-12) as well as for the levels from perturbing configurations of neutral lead have been measured using laser-induced fluorescence and Zeeman quantum-beat techniques. Two-step excitation was performed in a thermal atomic lead beam. Strong perturbations in the Rydberg series are manifested both in the g J factor and lifetime data.
Journal of Physics B Atomic Molecular and Optical Physics
New experimental data on the even-parity autoionizing Rydberg series in the region between 2P [iopmath latex="$_{1/2}$"] 1/2 [/iopmath] and 2P [iopmath latex="$_{3/2}$"] 3/2 [/iopmath] fine structure ionic limits of tin using a two-step laser excitation scheme in conjunction with an atomic beam apparatus are presented. The 5p6s 1P1 [iopmath latex="$\left(\case32, \case12\right)_{1}$"] (3/2,1/2)1 [/iopmath] level at 39 257.1 cm [iopmath latex="$^{-1}$"] -1 [/iopmath] was used as an intermediate level to access the levels lying above the first ionization threshold. The upper levels are designated using the jj-coupling scheme and the following Rydberg series 5pnf [iopmath latex="$\left(\case32, \case72\right)_{2}$"] (3/2,3/2)2 [/iopmath] ( [iopmath latex="$6 \leq n \leq 34$"] 6n34 [/iopmath] ), 5pnf [iopmath latex="$\left(\case32, \case52\right)_{2}$"] (3/2,3/2)2 [/iopmath] ( [iopmath latex="$6 \leq n \leq 18$&q...
Quantum-defect analysis of npnpnp and ndndnd rmH_3\rm{H_3}rmH_3 Rydberg energy levels
In this work, Rydberg energy levels of the triatomic hydrogen molecule (H3) are studied with multichannel quantum-defect theory. We extract the body-frame p-wave quantum defects from highly accurate ab initio electronic potential surfaces and calculate the quantum defects of higher angular momentum states in a long-range multipole potential model. Laboratory-frame quantum defect matrices emerge from a rovibrational-frame transformation carried out with accurate rovibrational states of H + 3 . Finally, we use the laboratory-frame quantum defects to calculate Rydberg energy levels for the fundamental neutral triatomic molecule H3.