The power spectrum of the light scattered by a three-level atom driven near resonance between the ground state (|1>) and the second excited state (|3>) by a monochromatic classical electric field is evaluated following the method developed by B. R. Mollow. The incident field is assumed to interact with the dipole moment between the states |1> and |3>, while the emitted light is assumed to interact with that between the state |3> and the first excited state |2> of the atom. The atom is assumed to relax to equilibrium only via radiation damping for the sake of simplicity. The power spectrum of the scattered field is explicitly calculated from the two-time atomic dipole moment correlation function, which is evaluated on a Markoff-type assumption, and various limiting cases are discussed. In Appendix the case is considered in which radiative damping between the higher excited state and the ground state is also present.The power spectrum of the light scattered by a three-level atom driven near resonance between the ground state (|1>) and the second excited state (|3>) by a monochromatic classical electric field is evaluated following the method developed by B. R. Mollow. The incident field is assumed to interact with the dipole moment between the states |1> and |3>, while the emitted light is assumed to interact with that between the state |3> and the first excited state |2> of the atom. The atom is assumed to relax to equilibrium only via radiation damping for the sake of simplicity. The power spectrum of the scattered field is explicitly calculated from the two-time atomic dipole moment correlation function, which is evaluated on a Markoff-type assumption, and various limiting cases are discussed. In Appendix the case is considered in which radiative damping between the higher excited state and the ground state is also present.

信州大学理学部紀要Mar 25, 19871 citation

Ionization of Doubly Excited Atoms in an Electric Field

Daniel I. Khomskii

Optics and SpectroscopyMar 1, 19650 citations

Effect of electric fields on the decay branching ratio of Pe1 doubly excited states in helium measured by time-resolved fluorescence

M. Žitnik, Francis Jean Penent, P. Lablanquie +5 more

We have measured the lifetimes of $^{1}P^{e}$ $(n=9--12)$ doubly excited states in static electric fields $(1--6\phantom{\rule{0.3em}{0ex}}\mathrm{kV}∕\mathrm{cm})$ by observing the decay of the fluorescence signal as a function of time. The effects of the field on these helium states below the second ionization threshold are twofold: their excitation becomes possible due to the Stark mixing with the optically allowed $^{1}P^{o}$ series, and their lifetime is strongly modified by the opening of the autoionization channel, not accessible in zero field. Although the electric field represents only a tiny perturbation of the atomic potential, a substantial shortening of the lifetimes below $100\phantom{\rule{0.3em}{0ex}}\mathrm{ps}$ is observed. This is the simplest quantum system where the ratio of autoionization to fluorescence decay probability can be effectively controlled by an electric field of moderate strength.We have measured the lifetimes of $^{1}P^{e}$ $(n=9--12)$ doubly excited states in static electric fields $(1--6\phantom{\rule{0.3em}{0ex}}\mathrm{kV}∕\mathrm{cm})$ by observing the decay of the fluorescence signal as a function of time. The effects of the field on these helium states below the second ionization threshold are twofold: their excitation becomes possible due to the Stark mixing with the optically allowed $^{1}P^{o}$ series, and their lifetime is strongly modified by the opening of the autoionization channel, not accessible in zero field. Although the electric field represents only a tiny perturbation of the atomic potential, a substantial shortening of the lifetimes below $100\phantom{\rule{0.3em}{0ex}}\mathrm{ps}$ is observed. This is the simplest quantum system where the ratio of autoionization to fluorescence decay probability can be effectively controlled by an electric field of moderate strength.

Physical Review ANov 22, 20068 citations

Approximate calculation of the radiative lifetimes of excited states of atoms and ions

Pavel Bogdanovich, G. L. Zhukauskas, Alina Momkauskaitė

OptSpApr 1, 19880 citations

A study of multiphoton ionization spectrum of Yb atom in electric fields

Fang Da

We report here the measurement of the resonance spectrum of different highly\|excited states of Yb atom by means of multiphoton excitation in the applied electric field from near zero to 15000V/cm.The investigated resonance peaks are identified and the selection rules and the intensities of the transition lines are discussed.The evolutions of the lines in applied electric fields are observed and analyzed.The results show directly that transitions involving the excitation of the 4f\+\{14\} subshell play an important role in the spectral behaviour of highly\|excited states of Yb atom.We report here the measurement of the resonance spectrum of different highly\|excited states of Yb atom by means of multiphoton excitation in the applied electric field from near zero to 15000V/cm.The investigated resonance peaks are identified and the selection rules and the intensities of the transition lines are discussed.The evolutions of the lines in applied electric fields are observed and analyzed.The results show directly that transitions involving the excitation of the 4f\+\{14\} subshell play an important role in the spectral behaviour of highly\|excited states of Yb atom.

Journal of China Institute of MetrologyJan 1, 20000 citations

A New Method of Measuring the Lifetimes of Excited States of Atoms

R. W. P. McWhirter

Jan 1, 19600 citations

We have measured the lifetimes of

^{1}P^{e}

(n=9--12)

doubly excited states in static electric fields

(1--6\phantom{\rule{0.3em}{0ex}}\mathrm{kV}∕\mathrm{cm})

by observing the decay of the fluorescence signal as a function of time. The effects of the field on these helium states below the second ionization threshold are twofold: their excitation becomes possible due to the Stark mixing with the optically allowed

^{1}P^{o}

series, and their lifetime is strongly modified by the opening of the autoionization channel, not accessible in zero field. Although the electric field represents only a tiny perturbation of the atomic potential, a substantial shortening of the lifetimes below

100\phantom{\rule{0.3em}{0ex}}\mathrm{ps}

is observed. This is the simplest quantum system where the ratio of autoionization to fluorescence decay probability can be effectively controlled by an electric field of moderate strength.