Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Optical and microwave study of very weak perturbation in high Rydberg states of lutecium

H. Maeda, Yukari Matsuo, M. Takami

Published Oct 28, 1992• 0 citations

Abstract

A very weak perturbation around the 6s252d 2D3/2 high Rydberg series of Lu has been studied. An intensity distribution of the optical spectrum around the perturber exhibits well developed Fano profile with significant decrease of radiative life time by the perturbation. Microwave two-photon transitions among the 6s2nd 2D3/2 series are measured to determine the accurate energy level structure of the perturbed series. Analysis of the microwave spectrum as well as the intensity profile and its delay-time dependence has led to the determination of accurate spectroscopic parameters.

DOI: 10.1117/12.130458

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Optical and microwave study of very weak perturbation in high Rydberg states of lutecium

H. Maeda, Yukari Matsuo, M. Takami

Published Oct 28, 1992• 0 citations

Publisher

Abstract

DOI: 10.1117/12.130458

Related papers

Optical and microwave study of a very weak perturbation in high Rydberg states of lutetium

H. Maeda, Yukari Matsuo, M. Takami

A very weak perturbation around the 6${\mathit{s}}^{2}$52d $^{2}$ ${\mathit{D}}_{3/2}$ high Rydberg series of Lu has been studied. A line-intensity distribution of the 6 ${\mathit{s}}^{2}$ nd $^{2}$ ${\mathit{D}}_{3/2}$ optical transitions exhibits a well-developed Beutler-Fano interference profile with a significant decrease of the radiative lifetime by the configuration interaction. An accurate energy-level structure of the perturbed series is determined by measuring microwave two-photon transitions among the 6 ${\mathit{s}}^{2}$ ${\mathit{nd}}^{2}$ ${\mathit{D}}_{3/2}$ series. The optical line-intensity profiles are analyzed directly by using the eigenfunctions of the perturbed Rydberg series derived from the microwave data. The results are compared with those obtained by the configuration-interaction theory developed by Fano [Phys. Rev. 124, 1866 (1961)].A very weak perturbation around the 6${\mathit{s}}^{2}$52d $^{2}$${\mathit{D}}_{3/2}$ high Rydberg series of Lu has been studied. A line-intensity distribution of the 6${\mathit{s}}^{2}$nd $^{2}$${\mathit{D}}_{3/2}$ optical transitions exhibits a well-developed Beutler-Fano interference profile with a significant decrease of the radiative lifetime by the configuration interaction. An accurate energy-level structure of the perturbed series is determined by measuring microwave two-photon transitions among the 6${\mathit{s}}^{2}$${\mathit{nd}}^{2}$${\mathit{D}}_{3/2}$ series. The optical line-intensity profiles are analyzed directly by using the eigenfunctions of the perturbed Rydberg series derived from the microwave data. The results are compared with those obtained by the configuration-interaction theory developed by Fano [Phys. Rev. 124, 1866 (1961)].

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A very weak perturbation around the 6${\mathit{s}}^{2}$52d

^{2}

{\mathit{D}}_{3/2}

high Rydberg series of Lu has been studied. A line-intensity distribution of the 6

{\mathit{s}}^{2}

^{2}

{\mathit{D}}_{3/2}

optical transitions exhibits a well-developed Beutler-Fano interference profile with a significant decrease of the radiative lifetime by the configuration interaction. An accurate energy-level structure of the perturbed series is determined by measuring microwave two-photon transitions among the 6

{\mathit{s}}^{2}

{\mathit{nd}}^{2}

{\mathit{D}}_{3/2}

series. The optical line-intensity profiles are analyzed directly by using the eigenfunctions of the perturbed Rydberg series derived from the microwave data. The results are compared with those obtained by the configuration-interaction theory developed by Fano [Phys. Rev. 124, 1866 (1961)].

Microwave transitions between the neighboring levels that belong to the

^{1}

{\mathit{S}}_{0}

^{1}

{\mathit{P}}_{1}

, and

^{1}

{\mathit{D}}_{2}

Rydberg series of ytterbium are studied for the principal quantum number ranging from 33 to 57. The term values and the quantum defects are determined by means of the general Rydberg-Ritz formula. The determined quantum defects show large linear energy dependence. The Zeeman effect measured for three

^{1}

{\mathit{P}}_{1}

and one

^{1}

{\mathit{D}}_{2}

Rydberg states under a weak external magnetic field is discussed.

To probe the configuration mixing between the Ba

6snd^{1}D_{2}

and

^{3}D_{2}

Rydberg series and the

5d7d^{1}D_{2}

perturber we have observed the radio-frequency transitions between the

5d7d^{1}D_{2}

state and the

6s28s^{1}S_{0}

6s24f^{3}F_{2}

, and

6s24f^{1}F_{3}

states using a delayed-field-ionization approach. The transitions are observed in the presence of small (\ensuremath{\sim}1 V/cm) electric fields, and from the Stark shifts of the transitions we are able to estimate the

^{1}D

and

^{3}D

Rydberg fractions of the

5d7d

state. Our measured zero-field term separations tie together previous optical measurements of the various Rydberg series involved. In addition, we have measured the lifetimes of the

6snd

states in the vicinity of the

5d7d

perturber to estimate the fraction of

5d7d

character in each of the Rydberg states. The values we find for the configuration mixing are in reasonable agreement with those determined by a multichannel-quantum-defect-theory analysis of the optical spectrum of the even-parity

J=2

states of Ba.