Acta Physica Sinica

RESONANCES OF PHOTOIONIZATION OF Ca AND Sr ATOMS IN AN ELECTRIC FIELD

QIU JI-ZHEN, Sen Zhang, WANG GANG, 浙江大学物理系

Published Jan 1, 1989• 0 citations

Abstract

Photoionization spectra of Ca and Sr atoms above the classical field-ionization threshold are observed by using two-photon excitation method. The relation between the resonances and the applied electric field as well as polarization, of laser beam are discussed.

DOI: 10.7498/aps.38.1172

Related papers

Observation of Electric-Field-Induced Resonances above the Ionization Limit in a One-Electron Atom

Richard R. Freeman, Nicholas P. Economou, Gary C. Bjorklund +1 more

Measurements of the relative photoionization cross sections of Rb in the presence of various strengths of external electric fields are reported. Systematic, field-dependent, resonance structure is observed not only for energies above the classical field-ionization limit, but above the zero-field ionization limit as well. A striking dependence of the cross section upon light polarization is also observed.

Physical Review LettersNov 20, 1978119 citations

DEPENDENCE OF FIELD-IONIZATION THRESHOLD ON |ml| FOR RYDBERG STATES OF Sr ATOM

LI JING, XU YUN-FEI, WANG YUN-XIAN +2 more

We have obtained Rydberg atom of different |ml| value by two-step excitation using polarized lasers. The field-ionization thresholds for 5snd (n= 22-27), | ml| =0,1,2 Rydberg states of Sr atom is measured by using a pulse electric field (up to 2.4kV/cm). Second-order approximate formula of field-ionization threshold that depend on the |ml| value is obtained and compared with the measured data.

Acta Physica SinicaJan 1, 19930 citations

Three-photon ionization of Ca

Roman S. Dygdała, Krzysztof Karasek, F. Giammanco +5 more

The two- and three-photon resonant ionization of Ca has been studied. Calcium atoms in the thermal atomic beam were ionized from the ground state by three-photon absorption. The ion signals exhibited resonances attributed to the two-photon transition and three-photon transitions due to , , and , autoionizing states. A simple theoretical model was used to reproduce the main features of the observed spectra due to the two-photon resonant ionization.

Journal of Physics B Atomic Molecular and Optical PhysicsMay 28, 199817 citations

Polarization dependence of direct three-photon ionization for Ca, Sr and Ba atoms

Zaza G. Melikishvili, D. T. Alimov, Fedor A. Ilkov

Experimental results for the probability ratio R 3 during three-photon ionization of Ca, Sr and Ba atoms in circularly and linearly polarized fields are presented for the principal quantum number range n=4-13. Unlike the alkali atoms, in most cases the measured R 3 magnitudes are considerably less than the values estimated by the Klarsfield-Maquet factorial formula.

Journal of Physics B Atomic Molecular and Optical PhysicsApr 28, 19915 citations

Resonance spectra of Ba Rydberg atom in electric field above the ionization limit

Jiakun Xu, Wenjie Yu, Qing Ye

Stark spectra of barium Rydberg states above the classical field-ionization limit have been recorded employing high-resolution laser spectroscopy with π and σ polarization.The resonance structure is observed obviously in experiment, and the theoretical calculations considering the core effect are well in coincidence with the experimental observation.

International Photonics and Optoelectronics MeetingsJan 1, 20170 citations

Resonance multiphoton ionization of alkaline Earth Ca, Ba, Sr atoms

M. A. Tursunov, B.B. Gaibnazarov, Kh. Bakieva +2 more

In this work, we study the process of three-photon resonant ionization of alkaline earth atoms Ca, Sr, and Ba. To carry out the experiments, a frequency-tunable laser setup was created. An effusive beam of alkali atoms served as an atomic target.

E3S Web of ConferencesJan 1, 20232 citations