Physical Review A

Theory for the Rydberg states of helium: Quantum defect extensions and comparison with experiment up to n = 102 for the singlet and triplet P states

G. W. F. Drake, Aaron Bondy

Published Jul 29, 2026• 1 citation

DOI: 10.1103/jzjp-k8yc

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Physical Review A

Theory for the Rydberg states of helium: Quantum defect extensions and comparison with experiment up to n = 102 for the singlet and triplet P states

G. W. F. Drake, Aaron Bondy

Published Jul 29, 2026• 1 citation

Publisher

DOI: 10.1103/jzjp-k8yc

Related papers

Theory for the Rydberg states of helium: Results for 2 ≤ n ≤ 35 and comparison with experiments for the singlet and triplet P states

G. W. F. Drake, Aaron T. Bondy, Oliver P. Hallett +1 more

Physical Review ADec 1, 20254 citations

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G. W. F. Drake

Advances in atomic, molecular, and optical physicsJan 1, 199342 citations

Hyperfine structure and three-channel quantum-defect theory of 6sndD21 Rydberg states of Ba

Herbert H. Rinneberg, Jörg Neukammer

The hyperfine structure of $6snd^{1}D_{2}$ Rydberg states of $^{135,137}\mathrm{Ba}$ is reported for principal quantum numbers ranging between $n=10$ and $n=50$ . From our data, singlet-triplet mixing coefficients have been deduced. A three-channel quantum-defect model has been used to analyze the resonance in singlet-triplet mixing of $6snd^{1}D_{2} \mathrm{and} ^{3}D_{2}$ Rydberg states in the vicinity of the $5d7d^{1}D_{2}$ perturber. For the determination of the scattering matrix, hyperfine-structure data were found to be essential. Good agreement has been achieved between calculated and experimental singlet-triplet mixing coefficients.The hyperfine structure of $6snd^{1}D_{2}$ Rydberg states of $^{135,137}\mathrm{Ba}$ is reported for principal quantum numbers ranging between $n=10$ and $n=50$. From our data, singlet-triplet mixing coefficients have been deduced. A three-channel quantum-defect model has been used to analyze the resonance in singlet-triplet mixing of $6snd^{1}D_{2} \mathrm{and} ^{3}D_{2}$ Rydberg states in the vicinity of the $5d7d^{1}D_{2}$ perturber. For the determination of the scattering matrix, hyperfine-structure data were found to be essential. Good agreement has been achieved between calculated and experimental singlet-triplet mixing coefficients.

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High n (2 < n < 50) Rydberg transitions in neutral helium

P. Quinet, Émile Biémont

May 27, 19930 citations

The hyperfine structure of

6snd^{1}D_{2}

Rydberg states of

^{135,137}\mathrm{Ba}

is reported for principal quantum numbers ranging between

n=10

and

n=50

. From our data, singlet-triplet mixing coefficients have been deduced. A three-channel quantum-defect model has been used to analyze the resonance in singlet-triplet mixing of

6snd^{1}D_{2} \mathrm{and} ^{3}D_{2}

Rydberg states in the vicinity of the

5d7d^{1}D_{2}

perturber. For the determination of the scattering matrix, hyperfine-structure data were found to be essential. Good agreement has been achieved between calculated and experimental singlet-triplet mixing coefficients.