The influence of multiple ionization thresholds on harmonic generation: Ar+

Abstract

We apply time-dependent R-matrix theory to investigate harmonic generation from ground state Ar+ with M=0 at a wavelength of 390 nm. Contributions associated with the different 3s(2)3p(4) ionization thresholds are assessed, including the interference between these. The dominant contribution originates from the second ionization threshold, 3s(2)3p(4) (1)D. Changes to the harmonic yields arising from the higher 3s3p(5) thresholds are also assessed. We further confirm that Ar+ has a higher harmonic yield than He for the same laser pulse, despite having a higher ionization threshold.

5 pages, 4 figures, 1 table

References in corpus (6)

• Bright quasi-phasematched soft x-ray harmonic radiation from Argon ions
• Time delay between photoemission from the 2p and 2s subshells of Neon
• The Impact of Multichannel and Multipole Effects on the Cooper Minimum in the High-Harmonics Spectrum of Argon
• Valence-shell photoionization of chlorine-like Ar${}^{+}$ ions
• Interference between competing pathways in harmonic generation
• Atomic harmonic generation in time-dependent R-matrix theory

Cited by in corpus (8)

• $R$-matrix with Time-dependence Theory for Ultrafast Atomic Processes in Arbitrary Light Fields
• Harmonic generation of noble-gas atoms in the Near-IR regime using ab-initio time-dependent R-matrix theory
• Pulse-shape control of two-color interference in high-order-harmonic generation
• Extreme-ultraviolet-initiated High-harmonic Generation in Ar${}^{+}$
• Population trapping in bound states during IR-assisted ultra-fast photoionization of Ne${}^{+}$
• On the Cooper Minimum in Singly ionized and Neutral Argon
• Multichannel Interference In High-Order Harmonic Generation From Ne(+) Driven By Ultrashort Intense Laser Pulse
• Enhanced Harmonic Generation from M=1 aligned Ar+