Eur. Phys. J. D 25, 103-111 (2003)
https://doi.org/10.1140/epjd/e2003-00236-0

Stark spectroscopy of high-lying odd parity levels in atomic samarium

¹ Department of Physics, Faculty of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
² Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan
³ Department of Clinical Radiology, Faculty of Health Sciences, Hiroshima International University, 555-36 Gakuendai, Kurose, Hiroshima 724-0695, Japan

Corresponding author: ^a kondo@photon.hepl.hiroshima-u.ac.jp

Received: 7 October 2002
Revised: 10 February 2003
Published online: 30 July 2003

Abstract

We have performed a series of experiments to observe 11 Stark-induced E1 transitions from the 15650.55 cm^-1 level to higher levels with odd parity in samarium (Sm) with optical double-resonance technique. Five Stark-induced E1 transition to the 28233.08, 28613.22, 28913.97, 29041.31 and 29130.03 cm^-1 levels have been observed. In order to investigate the contributors to the Stark-induced E1 transition, we have measured scalar and tensor polarizabilities for the observed Stark-induced E1 transitions. Clear Stark splittings were observed for the levels 28233.08 and 28613.22 cm^-1, and their tensor polarizabilities were determined for each isotope. Scalar polarizabilities were determined for the 28233.08, 28613.22, 28913.97 and 29130.03 cm^-1 levels for the first time. Among them, scalar polarizability for the 28233.08 cm^-1 level was the largest in magnitude and was  kHz/(kV/cm)² for ¹⁵²Sm. We noticed that both scalar and tensor polarizabilities of the 28233.08 cm^-1 level depend on the isotope; the difference of magnitude of the scalar and tensor polarizabilities between ¹⁴⁴Sm and ¹⁵⁴Sm were remarkably large and were about 10 and 6 percent, respectively.