Non-linear spectral splitting of Rydberg sodium in external fields

doi:10.1088/1674-1056/24/1/013202

Abstract We have studied highly excited sodium in various electric fields, parallel electric and magnetic fields, with one σ and π photon irradiation, and even in a magnetic field with a complex laser polarization configuration. The σ spectra shows a simple linear Stark effect with the applied electric field, while the π spectra exhibits a strong non-linear dependence on the electric field. The π transitions in parallel fields show a similar behavior to that in a pure electric field but the spectra get more smooth due to the magnetic field. The diamagnetic spectrum with laser polarization angles between 0 and π/2 proves that it can be reproduced by simple linear combination of π and σ components, indicating there is no interference between the π and σ channels. A full quantum calculation considering the quantum defects accounts for all the observations. The quantum defects, especially for the channel np, play an important role in the spectral profile.

Keywords: Stark spectrum magnetic spectrum quantum defect

Received: 24 June 2014
Revised: 14 July 2014
Accepted manuscript online:

PACS:	32.60.+i	(Zeeman and Stark effects)
	32.80.Ee	(Rydberg states)
	03.65.-w	(Quantum mechanics)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2013CB922003) and the National Natural Science Foundation of China (Grant Nos. 11174329 and 91121005).

Corresponding Authors: Liu Hong-Ping
E-mail: liuhongping@wipm.ac.cn

Cite this article:

Gao Wei (高伟), Yang Hai-Feng (杨海峰), Cheng Hong (成红), Zhang Shan-Shan (张珊珊), Liu Dan-Feng (刘丹峰), Liu Hong-Ping (刘红平) Non-linear spectral splitting of Rydberg sodium in external fields 2015 Chin. Phys. B 24 013202

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