Unravelling the dynamical origin of below- and near-threshold harmonic generation of H2+ in an intense NIR laser field

Heslar, John; Chu, Shih-I.

doi:10.1038/srep37774

Unravelling the dynamical origin of below- and near-threshold harmonic generation of H₂⁺ in an intense NIR laser field

Journal Article · Thu Nov 24 00:00:00 EST 2016 · Scientific Reports

DOI:https://doi.org/10.1038/srep37774· OSTI ID:1389831

Heslar, John ^[1]; Chu, Shih-I. ^[2]

National Taiwan Univ., Taipei (Taiwan)
National Taiwan Univ., Taipei (Taiwan); Univ. of Kansas, Lawrence, KS (United States)

Recently, the study of near- and below- threshold regime harmonics as a potential source of intense coherent vacuum-ultraviolet radiation has received considerable attention. However, the dynamical origin of these lower harmonics, particularly for the molecular systems, is less understood and largely unexplored. Here we perform the first fully ab initio and high precision 3D quantum study of the below- and near-threshold harmonic generation of H₂⁺ molecules in an intense 800-nm near-infrared (NIR) laser field. Furthermore, combining with a synchrosqueezing transform of the quantum time-frequency spectrum and an extended semiclassical analysis, we explore in-depth the roles of various quantum trajectories, including short- and long trajectories, multiphoton trajectories, resonance-enhanced trajectories, and multiple rescattering trajectories of the below- and near- threshold harmonic generation processes. Our results shed new light on the dynamical origin of the below- and near-threshold harmonic generation and various quantum trajectories for diatomic molecules for the first time.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Kansas, Lawrence, KS (United States). Dept. of Chemistry

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

OSTI ID:: 1389831

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 6; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (3)

Resonantly-initiated quantum trajectories and their role in the generation of near-threshold harmonics Camp, Seth; Beaulieu, Samuel; Schafer, Kenneth J. Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 51, Issue 6 https://doi.org/10.1088/1361-6455/aaac12	journal	February 2018
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High-order-harmonic generation of vibrating H 2 + and D 2 + Telnov, Dmitry A.; Heslar, John; Chu, Shih-I Physical Review A, Vol. 95, Issue 4 https://doi.org/10.1103/physreva.95.043425	journal	April 2017

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