Tracing origins of asymmetric momentum distribution for polar molecules in strong linearly-polarized laser fields

Abstract

We study the ionization dynamics of oriented HeH${}^{+}$ in strong linearly-polarized laser fields by numerically solving the time-dependent Schrödinger equation. The calculated photoelectron momentum distributions for parallel orientation show a striking asymmetric structure. With a developed model pertinent to polar molecules, we trace the electron motion in real time. We show that this asymmetric structure arises from the interplay of the Coulomb effect and the permanent dipole in strong laser fields. This structure can be used to probe the degree of orientation which is important in ultrafast experiments for polar molecules. we also check our results for other polar molecules such as CO and BF.

arXiv comment6 pages, 6figures; typos corrected; revised argument in section II and section V, results unchanged

References in corpus (5)

• Low-Energy Structures in Strong Field Ionization Revealed by Quantum Orbits
• First astrophysical detection of the helium hydride ion (HeH${}^{+}$)
• Oriented rotational wave-packet dynamics studies via high harmonic generation
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• Two-Color Attosecond Chronoscope
• Local most-probable routes and classic-quantum correspondence in strong-field two-dimensional tunneling ionization
• Measuring Coulomb-Induced Ionization Time Lag with a Calibrated Attoclock
• Strong-field response time and its implications on attosecond measurement