Two-electron effects in the multiphoton ionization of magnesium with 400-nm 150-fs pulses

Abstract

The multiphoton ionization and photoelectron spectra of magnesium were studied at laser intensities of up to 6 × 10 13 Wcm −2 using 150 fs laser pulses of a wavelength of 400 nm. The results indicated that a variety of different ionization mechanisms played a role in both types of spectra. A theoretical model describing the processes is presented and the routes to ionization are identified. The work demonstrates the significance of the two-electron nature of the atom in interpreting the experimental results.

Charge-State Resolved above Threshold Ionization

“…In studies at long wavelengths it is not taken into account, although from ion yield measurements we know that for some atoms the double ionization yield at an intensity around 10 14 W͞cm 2 , at which the studies have been performed, is of the order of 10% [12] of the total yield. Other experiments in two valence electron systems have also shown evidence of double ionization contribution in short pulse ATI spectra [13]. Double or multiple ionizations remain in most of the cases hidden and ignored in the ATI spectra.…”

Ionization in elliptically polarized pulses: Multielectron polarization effects and asymmetry of photoelectron momentum distributions

“…Simultaneously, their polarizabilities are high and substantially different from those of the corresponding ions. We perform our simulations for Mg since multiphoton ionization of this atom has already attracted attention in experiment [79][80][81][82][83] and theory [84][85][86][87][88]. For Mg, I p = 0.28 a.u., α N = 71.33 a.u., and α I = 35.00 a.u., and at the wavelength of 800 nm, our simulation technique is applicable at the intensities of 2.35 × 10 13 −1.0 × 10 14 W/cm 2 , for which the Keldysh parameter is γ = 2.0 − 1.0.…”

Rescattering nonsequential ionization of Ne3+, Ne4+, NeEkanayake1, Luo2, Wen3 et al. 2012Phys. Rev. A12140View full textAdd to dashboardCite

“…Two-electron strong field dynamics at 400 nm has been studied, for example, in helium [27], calcium [28], and magnesium [29]. Fragmentation, ionization, and dissociation studies for molecular species in 400-nm ultrafast strong fields include benzene, cyclic alkanes [30], and control experiments in Fe(CO) 5 [31].…”