| Issue |
EPL
Volume 126, Number 2, April 2019
|
|
|---|---|---|
| Article Number | 23001 | |
| Number of page(s) | 6 | |
| Section | Atomic, Molecular and Optical Physics | |
| DOI | https://doi.org/10.1209/0295-5075/126/23001 | |
| Published online | 03 June 2019 | |
High-order harmonic generation from molecular ions in the coherent electronic states
College of Physics and Information Engineering, Shanxi Normal University - Linfen 041004, China and Key Laboratory of Spectral Measurement and Analysis of Shanxi Province, Shanxi Normal University Linfen 041004, China
(a) sxxymiao@126.com
Received: 24 January 2019
Accepted: 26 April 2019
The high-order harmonic generation from the tritium molecular ions in the coherent state has been numerically simulated by solving the three-state time-dependent Schrödinger equation based on the non-Born-Oppenheimer approximation. Two resonant pump pulses prepare the system in the coherent superposition of the 
and the 
states. A long-wavelength probe pulse is selected to generate the intense harmonics. By increasing the population of the state, the dependence of the harmonic spectra on pump-probe delay time tends to exhibit obvious redshift. In this work, not only is the physical image of harmonic emission from coherent wave packets established, but also a new physical mechanism of the redshift in long-wavelength region is revealed. Moreover, we present a scheme of manipulating the redshift to further verify the underlying mechanism.
PACS: 32.80.Rm – Multiphoton ionization and excitation to highly excited states / 42.65.Re – Ultrafast processes; optical pulse generation and pulse compression / 42.65.Ky – Frequency conversion; harmonic generation, including higher-order harmonic generation
© EPLA, 2019
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