Photoionization of Ca in a static electric field

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/52818

Title:	Photoionization of Ca in a static electric field
Authors:	Fang,TK;Lo,JI;Yih,TS;Chang,TN
Contributors:	物理學系
Keywords:	RYDBERG STATES;STARK STRUCTURE;BARIUM;AUTOIONIZATION;RESONANCES;SPECTRA;HELIUM;LIMIT
Date:	2010
Issue Date:	2012-06-11 10:46:04 (UTC+8)
Publisher:	國立中央大學
Abstract:	We present a joint theoretical and experimental investigation for electric-field effects on ground-state photoionization of Ca. For an electric field with its direction along the z axis, the dominant field-free, doubly excited, odd-parity (i. e., 3dnp and/or 3dnf) resonances of the (1,3)L(J=1)(o) (i.e., (1,3)P(J=1)(o) and (3)D(J=1)(o)) symmetries are coupled with the even-parity (i.e., 3dns, 3dnd, and/or 3dng) resonances of the (1,3)L(J=0)(e) (i.e., (1)S(J=0)(e) and (3)P(J=0)(e)) and (1,3)L(J=2)(e) (i.e., (3)P(J=2)(e), (1,3)D(J=2)(e), and (3)F(J=2)(e)) symmetries. Using a B-spline-based complex-rotation method with spin-dependent interaction, our theoretically calculated spectrum is found to be in good agreement with the observed spectrum from a cross-beam photoionization experiment for field strengths up to 25 kV/cm. We present in detail a number of qualitative features of the field-induced level crossing and avoided crossing in energy between neighboring resonances, their corresponding changes in width, and the resulting variation in resonance structure profiles. A few " hidden" resonances due to strong overlap with more prominant resonances are also identified theoretically.
Relation:	PHYSICAL REVIEW A
Appears in Collections:	[Department of Physics] journal & Dissertation

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