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Full-dimensional treatment of short-time vibronic dynamics in a molecular high-order-harmonic-generation process in methane

The method of multiconfigurational strong-field approximation with Gaussian nuclear wave packets is developed to study the effect of nuclear motion for molecules in strong laser fields, where an investigation on the polyatomic molecule methane reveals that the high-order-harmonic generation contains signatures of field-free vibronic dynamics at the conical intersection and…

Solving the Schrödinger Equation with deep neural networks

A deep (convolutional) neural network is trained to predict the ground-state energy of an electron in two-dimensional potentials. The machinery of deep learning is developed to learn the mapping between potential and energy, which bypasses the need to numerically solve the Schrödinger equation and the need for computing wave functions.…

Signatures of the continuum electron phase in molecular strong-field photoelectron holography

Laser-driven electron recollision is at the heart of the rapidly growing field of attosecond science. The recollision wavepacket is qualitatively described within the strong-field approximation, which commonly assumes tunnelling ionization and plane-wave propagation of the liberated electron in the continuum. However, with increasing experimental sophistication, refinements to this simple model have…

Direct imaging of rotational wave-packet dynamics of diatomic molecules

We use linearly polarized 45 fs pulses to create rotational wave packets in N2 and O2. We Coulomb explode molecules with a high-intensity circularly polarized pulse and use an ion imaging detector to measure a series of two-dimensional projections of the wave packet’s angular distribution in 27 fs increments. We highlight the evolving wave…