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Circular Dichroism in Atomic Resonance-Enhanced Few-Photon Ionization

Taylor J. Moon, Nicolas Douguet, Haruma Handi Nishanka De Silva +2 more

Bulletin of the American Physical SocietyJun 3, 20210 citations

Three-photon ionization of the potassium atom by linearly and circularly polarized light

Nikolai B. Delone, D. T. Alimov, P.K Khabibulayen +2 more

Optics CommunicationsMar 1, 19819 citations

Rotation spectra of the polarization plane and circular dichroism of alkaline atoms in strong radiation fields

Anna V. Kuptsova

Russian Physics JournalMay 1, 19990 citations

Circular dichroism in atomic resonance-enhanced few-photon ionization

A. H. N. C. De Silva, T. Moon, K. L. Romans +8 more

We investigate few-photon ionization of lithium atoms prepared in the polarized $2p\phantom{\rule{0.16em}{0ex}}({m}_{\ensuremath{\ell}}=+1)$ state when subjected to femtosecond light pulses with left- or right-handed circular polarization at wavelengths between 665 and 920 nm. We consider whether ionization proceeds more favorably for the electric field co- or counter-rotating with the initial electronic current density. Strong asymmetries are found and quantitatively analyzed in terms of ``circular dichroism'' (CD). While the intensity dependence of the measured CD values is rather weak throughout the investigated regime, a very strong sensitivity on the center wavelength of the incoming radiation is observed. While the co-rotating situation overall prevails, the counter-rotating geometry is strongly favored around 800 nm due to the $2p\text{\ensuremath{-}}3s$ resonant transition, which can only be driven by counter-rotating fields. The observed features provide insights into the helicity dependence of light-atom interactions, and on the possible control of electron emission in atomic few-photon ionization by polarization-selective resonance enhancement.We investigate few-photon ionization of lithium atoms prepared in the polarized $2p\phantom{\rule{0.16em}{0ex}}({m}_{\ensuremath{\ell}}=+1)$ state when subjected to femtosecond light pulses with left- or right-handed circular polarization at wavelengths between 665 and 920 nm. We consider whether ionization proceeds more favorably for the electric field co- or counter-rotating with the initial electronic current density. Strong asymmetries are found and quantitatively analyzed in terms of ``circular dichroism'' (CD). While the intensity dependence of the measured CD values is rather weak throughout the investigated regime, a very strong sensitivity on the center wavelength of the incoming radiation is observed. While the co-rotating situation overall prevails, the counter-rotating geometry is strongly favored around 800 nm due to the $2p\text{\ensuremath{-}}3s$ resonant transition, which can only be driven by counter-rotating fields. The observed features provide insights into the helicity dependence of light-atom interactions, and on the possible control of electron emission in atomic few-photon ionization by polarization-selective resonance enhancement.

arXiv:2103.07499Physical Review AMay 28, 202124 citations

Circular dichroism in the polarization of the fluorescence resulting from the decay of photoionized Ca atoms

John B. West, Kiyoshi Ueda, N M Kabachnik +3 more

Circular dichroism has been detected in the polarization of the fluorescence resulting from the decay of excited calcium ions. Synchrotron radiation was used to both ionize and excite calcium atoms from their ground state, and the photoejected electron was detected in coincidence with the polarized fluorescent photon. By introducing a degree of left, then right circularly polarized light into the incident photon beam the circular dichroism could be measured. The analysis of the results was carried out using recent developments of the statistical tensor method, and it was possible to determine the sign of the phase difference between the outgoing waves.Circular dichroism has been detected in the polarization of the fluorescence resulting from the decay of excited calcium ions. Synchrotron radiation was used to both ionize and excite calcium atoms from their ground state, and the photoejected electron was detected in coincidence with the polarized fluorescent photon. By introducing a degree of left, then right circularly polarized light into the incident photon beam the circular dichroism could be measured. The analysis of the results was carried out using recent developments of the statistical tensor method, and it was possible to determine the sign of the phase difference between the outgoing waves.

Physical Review AJan 1, 199621 citations

Circular Dichroism and Related Effects In Multiphoton Transitions

Nikolai L. Manakov

Springer eBooksJan 1, 19962 citations

Circular dichroism in few-photon ionization of excited, polarized, and dressed lithium atoms

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