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Odd-fold-symmetric spiral momentum distributions and their Stark distortions in hydrogen

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Abstract

Odd-fold-symmetric spiral photoelectron momentum distributions in hydrogen atoms ionized by two counter-rotating circularly polarized and time-delayed laser pulses with different carrier frequencies are simulated by utilizing the strong field approximation theory. The odd-fold symmetry emerges when the total number of absorbed photons is odd. We also find that the symmetric patterns of the momentum distributions become distorted when the optical Stark effect is considered. We attribute this distortion to the nonlinear Stark phase. We anticipate that our result will be useful in studies on the atomic Stark effect.

© 2018 Optical Society of America

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