Physical Review A

Lifetimes of Rydberg levels in the perturbed 6snp 3 P2 series of ytterbium i

Guo Chuan, Yingning Yu, Hua Yu, Jiang Zhankui, Peng Weixian

Published Feb 1, 1993• 3 citations

Abstract

Using three-step laser excitation in an atomic beam and a time-resolved spectroscopy technique, we measured both the lifetimes of the Rydberg levels of Yb i belonging to the perturbed series 6nsp $^{3}$${\mathit{P}}_{2}$ and the lifetimes of the perturbing 4${\mathit{f}}^{13}$5${\mathit{d}}^{2}$6s $^{3}$${\mathit{P}}_{2}$${,}^{1}$${\mathit{D}}_{2}$ levels. An expected shortening has been observed for the lifetimes of those levels which are strongly mixed with the perturbers.

DOI: 10.1103/physreva.47.1551

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Physical Review A

Lifetimes of Rydberg levels in the perturbed 6snp 3 P2 series of ytterbium i

Guo Chuan, Yingning Yu, Hua Yu, Jiang Zhankui, Peng Weixian

Published Feb 1, 1993• 3 citations

Publisher

Abstract

Using three-step laser excitation in an atomic beam and a time-resolved spectroscopy technique, we measured both the lifetimes of the Rydberg levels of Yb i belonging to the perturbed series 6nsp

^{3}$${\mathit{P}}_{2}

and the lifetimes of the perturbing 4

{\mathit{f}}^{13}

{\mathit{d}}^{2}

^{3}$${\mathit{P}}_{2}$${,}^{1}$${\mathit{D}}_{2}

levels. An expected shortening has been observed for the lifetimes of those levels which are strongly mixed with the perturbers.

DOI: 10.1103/physreva.47.1551

Related papers

Studies on natuval radiative lifetime in perterbed Rydberg odd parity sequences of Yb I

Peng Weixian

Acta Optica SinicaJan 1, 19930 citations

Natural radiative lifetime of Yb in the perturbed 6snd 1 ,3 D2 sequences

Jiang Zhankui, Chengfei Wang, Dadi Wang

Natural radiative lifetimes of ytterbium in the 6snd ${}^{1}$ ${D}_{2}$ (n=10--29), 6snd ${}^{3}$ ${D}_{2}$ (n=10--20) Rydberg sequences have been measured using stepwise excitation and a fluorescence-decay monitoring method. The lifetimes are perturbed by the 4${f}^{13}$5d6s6p configuration near n=11 and 27, except when the ${n}^{\mathrm{*}3}$ dependence of the lifetime values appeared. The lifetimes of the perturbing 5d6s6p states were also measured.Natural radiative lifetimes of ytterbium in the 6snd ${}^{1}$${D}_{2}$ (n=10--29), 6snd ${}^{3}$${D}_{2}$ (n=10--20) Rydberg sequences have been measured using stepwise excitation and a fluorescence-decay monitoring method. The lifetimes are perturbed by the 4${f}^{13}$5d6s6p configuration near n=11 and 27, except when the ${n}^{\mathrm{*}3}$ dependence of the lifetime values appeared. The lifetimes of the perturbing 5d6s6p states were also measured.

Physical Review AOct 1, 19879 citations

Very high resolution study of high Rydberg levels of the configurations 4f14 6snd of Yb I

L. Barbier, R.-J. Champeau

High Rydberg levels of ytterbium were studied in a beam of metastable atoms. Levels of the series 4f $^{14}$ 6 $sn$ d were populated from the metastable 4f $^{14}$ 6s 6p $^3$ P $_o$ level by means of the U.V. light of a frequency-doubled single-mode dye laser and detected using the field ionization technique. The critical ionization fields $F_c$ of the levels 4f $^{14}$ 6 $sn$ d $^3$ D $_1$ (24 ≤ n ≤ 57) were measured and found to obey the saddle point law ( $F_c$ = (16 $n^{*4}$ ) $^{-1}$ ). The hyperfine structures of the odd isotopes were investigated. They are very peculiar due to the fact that the hyperfine interaction is of the same order of magnitude as (or even for the highest $n$ values, much more important than) the spin-orbit and electrostatic interactions. A theoretical account of the observed structures using the Slater-Condon parametric method is given. The relative influence of the excited ( $n$ d) and of the non-excited (6s) optical electron could thus be studied. Furthermore the influence of a valence level perturbing only the odd isotopes components for $n$ = 26 was demonstrated.High Rydberg levels of ytterbium were studied in a beam of metastable atoms. Levels of the series 4f$^{14}$ 6$sn$d were populated from the metastable 4f$^{14}$ 6s 6p $^3$P$_o$ level by means of the U.V. light of a frequency-doubled single-mode dye laser and detected using the field ionization technique. The critical ionization fields $F_c$ of the levels 4f$^{14}$ 6$sn$d $^3$D$_1$ (24 ≤ n ≤ 57) were measured and found to obey the saddle point law ($F_c$ = (16 $n^{*4}$)$^{-1}$). The hyperfine structures of the odd isotopes were investigated. They are very peculiar due to the fact that the hyperfine interaction is of the same order of magnitude as (or even for the highest $n$ values, much more important than) the spin-orbit and electrostatic interactions. A theoretical account of the observed structures using the Slater-Condon parametric method is given. The relative influence of the excited ($n$d) and of the non-excited (6s) optical electron could thus be studied. Furthermore the influence of a valence level perturbing only the odd isotopes components for $n$ = 26 was demonstrated.

Journal de physiqueJan 1, 198030 citations

Two-colour three-photon excitation of the 6s n f 1,3 F 3 and 6s n p 1 P 1 , 3 P 1,2 Rydberg levels of Yb I

Raheel Ali, M Yaseen, Ali Nadeem +2 more

We report a reinvestigation of the 6snf 1,3F3 (9 < or = n < or = 30), 6snp 1P1 (12 < or = n < or = 56), 6snp 3P1 (12 < or = n < or = 21) and 6snp 3P2 (12 < or = n < or = 19) Rydberg states of ytterbium atom using a two-colour three-photon resonant excitation technique through the 4f146s5d 1D2 intermediate level. The spectra were observed using two dye lasers simultaneously pumped by a common Nd:YAG laser in conjunction with a thermionic diode ion detector. Some new levels have been identified in the vicinity of the 6snf (9 < or = n < or = 16) Rydberg levels. Three new perturbers 4f135d 26s3D3 at 48 584.1 cm-1, 4f135d26s 1F3 at 49 122.4 cm-1 and 4f135d26s 3G3 at 49 661.6 cm-1 have been located in addition to observation of the 6s9d 1D2 and 6p2 1D2 even parity levels due to sequential excitation from the 6s6p 1P1 level. The interchannel interactions among the J = 2 and J = 3 channels have been analysed using multichannel quantum defect theory.We report a reinvestigation of the 6snf 1,3F3 (9 < or = n < or = 30), 6snp 1P1 (12 < or = n < or = 56), 6snp 3P1 (12 < or = n < or = 21) and 6snp 3P2 (12 < or = n < or = 19) Rydberg states of ytterbium atom using a two-colour three-photon resonant excitation technique through the 4f146s5d 1D2 intermediate level. The spectra were observed using two dye lasers simultaneously pumped by a common Nd:YAG laser in conjunction with a thermionic diode ion detector. Some new levels have been identified in the vicinity of the 6snf (9 < or = n < or = 16) Rydberg levels. Three new perturbers 4f135d 26s3D3 at 48 584.1 cm-1, 4f135d26s 1F3 at 49 122.4 cm-1 and 4f135d26s 3G3 at 49 661.6 cm-1 have been located in addition to observation of the 6s9d 1D2 and 6p2 1D2 even parity levels due to sequential excitation from the 6s6p 1P1 level. The interchannel interactions among the J = 2 and J = 3 channels have been analysed using multichannel quantum defect theory.

Journal of Physics B Atomic Molecular and Optical PhysicsJan 1, 199916 citations

Multichannel quantum-defect theory of lifetimes for highly excited states of atoms: Calculation of Yb lifetimes in the perturbed 6snd 1 ,3 D2 sequences

X. W. Liu, Z -W Wang

By combining the quantum theory of radiative transition with multichannel quantum-defect theory, we have derived a general formula to calculate the lifetimes of highly excited states for atoms. As an example, we have evaluated the lifetimes for the perturbed 6snd $^{1}D_{2}$ (n=8--40) and 6snd $^{3}D_{2}$ (n=10--26) Rydberg levels, and the perturbers of the ytterbium atom. We have not only obtained results that are in perfect agreement with the recent measurements, but also predicted the lifetimes of 18 other highly excited states. The results indicate that the dramatic variation for lifetimes of Rydberg states in the vicinity of perturbing states is due to the strong channel interaction.By combining the quantum theory of radiative transition with multichannel quantum-defect theory, we have derived a general formula to calculate the lifetimes of highly excited states for atoms. As an example, we have evaluated the lifetimes for the perturbed 6snd $^{1}D_{2}$ (n=8--40) and 6snd $^{3}D_{2}$ (n=10--26) Rydberg levels, and the perturbers of the ytterbium atom. We have not only obtained results that are in perfect agreement with the recent measurements, but also predicted the lifetimes of 18 other highly excited states. The results indicate that the dramatic variation for lifetimes of Rydberg states in the vicinity of perturbing states is due to the strong channel interaction.

Physical Review AAug 1, 198915 citations

Rydberg and autoionizing states of neutral ytterbium

C. B. Xu, Xiang-Yuan Xu, Wenbo Huang +2 more

In the study of Yb atomic Rydberg states, new members of 6sns 1 S 0 series for n=23, 24, 66-116 and 6snd 1 D 2 series for n=81-114 were observed. The data are in excellent agreement with the MQDT analysing results. The autoionizing Rydberg series 6p 1 2 /n's ( 1/2 , 1/2 ) 1 0 were investigated by three-step laser excitation. The ICE model was used to explain the experimental spectrum, and it has been proved to be suitable for describing the excitation of the autoionizing Rydberg states with a weakly-excited core.In the study of Yb atomic Rydberg states, new members of 6sns 1 S 0 series for n=23, 24, 66-116 and 6snd 1 D 2 series for n=81-114 were observed. The data are in excellent agreement with the MQDT analysing results. The autoionizing Rydberg series 6p 1 2 /n's ( 1/2 , 1/2 ) 1 0 were investigated by three-step laser excitation. The ICE model was used to explain the experimental spectrum, and it has been proved to be suitable for describing the excitation of the autoionizing Rydberg states with a weakly-excited core.

Journal of Physics B Atomic Molecular and Optical PhysicsSep 14, 199422 citations

Using three-step laser excitation in an atomic beam and a time-resolved spectroscopy technique, we measured both the lifetimes of the Rydberg levels of Yb i belonging to the perturbed series 6nsp

^{3}$${\mathit{P}}_{2}

and the lifetimes of the perturbing 4

{\mathit{f}}^{13}

{\mathit{d}}^{2}

^{3}$${\mathit{P}}_{2}$${,}^{1}$${\mathit{D}}_{2}

levels. An expected shortening has been observed for the lifetimes of those levels which are strongly mixed with the perturbers.

Natural radiative lifetimes of ytterbium in the 6snd

{}^{1}

{D}_{2}

(n=10--29), 6snd

{}^{3}

{D}_{2}

(n=10--20) Rydberg sequences have been measured using stepwise excitation and a fluorescence-decay monitoring method. The lifetimes are perturbed by the 4${f}^{13}$5d6s6p configuration near n=11 and 27, except when the

{n}^{\mathrm{*}3}

dependence of the lifetime values appeared. The lifetimes of the perturbing 5d6s6p states were also measured.

High Rydberg levels of ytterbium were studied in a beam of metastable atoms. Levels of the series 4f

^{14}

sn

d were populated from the metastable 4f

^{14}

6s 6p

^3

_o

level by means of the U.V. light of a frequency-doubled single-mode dye laser and detected using the field ionization technique. The critical ionization fields

F_c

of the levels 4f

^{14}

sn

^3

_1

(24 ≤ n ≤ 57) were measured and found to obey the saddle point law (

F_c

= (16

n^{*4}

)

^{-1}

). The hyperfine structures of the odd isotopes were investigated. They are very peculiar due to the fact that the hyperfine interaction is of the same order of magnitude as (or even for the highest

n

values, much more important than) the spin-orbit and electrostatic interactions. A theoretical account of the observed structures using the Slater-Condon parametric method is given. The relative influence of the excited (

n

d) and of the non-excited (6s) optical electron could thus be studied. Furthermore the influence of a valence level perturbing only the odd isotopes components for

n

= 26 was demonstrated.

^{1}D_{2}

(n=8--40) and 6snd

^{3}D_{2}

(n=10--26) Rydberg levels, and the perturbers of the ytterbium atom. We have not only obtained results that are in perfect agreement with the recent measurements, but also predicted the lifetimes of 18 other highly excited states. The results indicate that the dramatic variation for lifetimes of Rydberg states in the vicinity of perturbing states is due to the strong channel interaction.