Multichannel Interference In High-Order Harmonic Generation From Ne(+) Driven By Ultrashort Intense Laser Pulse

Abstract

We apply the time-dependent R-matrix method to investigate harmonic generation from Ne(+) at a wavelength of 390 nm and intensities up to 10(15) Wcm(-2). The 1s(2)2s(2)2p(4) (3)P(e), (1)D(e), and (1)S(e) states of Ne(2+) are included as residual-ion states to assess the influence of interference between photoionization channels associated with these thresholds. The harmonic spectrum is well approximated by calculations in which only the (3)P(e) and (1)D(e) thresholds are taken into account, but no satisfactory spectrum is obtained when a single threshold is taken into account. Within the harmonic plateau, extending to about 100 eV, individual harmonics can be suppressed at particular intensities when all Ne(2+) thresholds are taken into account. The suppression is not observed when only a single threshold is accounted for. Since the suppression is dependent on intensity, it may be difficult to observe experimentally.

10 pages, 4 figures, 4 tables

References in corpus (7)

• 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
• Enhanced nonlinear response of Ne${}^{8+}$ to intense ultrafast x rays
• Interference between competing pathways in harmonic generation
• Atomic harmonic generation in time-dependent R-matrix theory
• The influence of multiple ionization thresholds on harmonic generation: Ar+

Cited by in corpus (4)

• 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
• Population trapping in bound states during IR-assisted ultra-fast photoionization of Ne${}^{+}$
• Electron dynamics in the carbon atom induced by spin-orbit interaction