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arXiv · 1407.5458

Effect of nuclear motion on high-order harmonic generation of H$_2^+$ in intense ultrashort laser pulses

Hamed Ahmadi·Ali Maghari·Hassan Sabzyan·Ali Reza Niknam·Mohsen Vafaee
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Abstract

High-order harmonic generation is investigated for H$_2^+$ and D$_2^+$ with and without Born-Oppenheimer approximation by numerical solution of full dimensional electronic time-dependent Schrödinger equation under 4-cycle intense laser pulses of 800 nm wavelength and $I$=4, 5, 7, 10 $\times 10^{14}$ W$/$cm$^2$ intensities. For most harmonic orders, the intensity obtained for D$_2^+$ is higher than that for H$_2^+$, and the yield difference increases as the harmonic order increases. Only at some low harmonic orders, H$_2^+$ generates more intense harmonics compared to D$_2^+$. The results show that nuclear motion, ionization probability and system dimensionality must be simultaneously taken into account to properly explain the isotopic effects on high-order harmonic generation and to justify experimental observations.

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Hamed Ahmadi, Ali Maghari, Hassan Sabzyan, Ali Reza Niknam, Mohsen Vafaee. 2014-07-21. Effect of nuclear motion on high-order harmonic generation of H$_2^+$ in intense ultrashort laser pulses. https://doi.org/10.1103/physreva.90.043411

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