Stark-mixing effect on the 6p 2 1 S 0−6p 2 3 P 2 transition in Pb I

Wei-Guo Jin, Masayuki Kawamura, Tatsuya Minowa

Zhang Jie, Cheng Bingying, Zhang Daozhong +3 more

In PbCl 2 vapor under the mutual interaction of two laser beams with wavelengths at λ 1 =266nm and λ 2 =280.2nm (or 282.3nm), a strong coherent emission at 405.8nm is generated, which corresponds to transition between states 6p7s 3 P 1 0 and 6p 2 3 P 2 in atomic Pb. The dependences of its intensity I 405.8 on the power and detuning of λ 2 are measured. The results show that it is caused by a four-wave mixing process in Pb, in which the initial state is a metastable state, 6p 2 3 P 2 .

Jerzy Kwela

The 301.5 nm electric-field-induced quench radiation on a thermal beam of neutral Bi atoms in the metastable 6p3 2Ρ3/2 state for transition to the ground 6p 3 4 S3 /2 state was observed.The measurement of the Stark-enhanced intensity of the radiation as a function of the electric field yields a relationship between the field-free-decay rates for transitions between the metastable 6p 3 2P3/2 state and the nearby states that are mixed in by the field.Using the known decay rates, the measurement sets an approximate transition rate of A(6p3 2 Ρ3/2 → 6p2 7s 4 Ρ112 ) (0.50 ± 0.05) s -1 .

J. Li, William Arie van Wijngaarden

Masayuki Kawamura, Wei-Guo Jin, Nichika Kobayashi +2 more

Shiben Li, Dai Chang-Jian

Using a three-step laser saturation excitation technique, the saturation effects on the Ba 6p n s ( J = 1) and 6p n d ( J = 1, 3) autoionization spectra are observed systemically in zero field. These saturation spectra are introduced to determine the high n members of 6p nl ( l = 0, 2) autoionizing series and are used to analyse the channel interactions among the autoionizing series in zero field. Furthermore, the saturation excitation technique is applied to the electric field case, in which the saturation spectra of Ba 6p nk (| M | = 0, 1) autoionizing Stark states are measured. Most of these saturation spectra are observed for the first time so far as we know, which indicate the mixing of the autoionizing states in the electric fields.