Absolute cross section for photoionization of Mn⁺in the 3p region

Abstract

The absolute cross section for photoionization of Mn+ has been measured using the merged-beam technique, focusing on the region of the ‘giant’ 3p → 3d resonance. The main discrepancy between theory and earlier experiments has been removed. However, more extensive relativistic calculations are required for a rigorous comparison with theory.

Potential barrier effects in high-order harmonic generation by transition-metal ions

“…Thus, to obtain the photorecombination cross sectionσ (E) we need both the total photoionization cross section σ and the angular distribution asymmetry parameter β(E). The total photoionization cross section is available from both experimental measurements [21,[23][24][25] and theoretical calculations [22,[26][27][28], whereas the asymmetry parameters are mostly available from theoretical calculations [22,27,29]. However, our results for Cr + in Figs.…”

“…3 we compare the experimental results with our theoretical predictions for both the resonantly enhanced harmonic and its neighboring harmonics using experimental data [21] for the total photoionization cross sections. Since the widths of Fano profiles are 1.2 eV (for Cr + ) and 1.8 eV (for Mn + ) [24], while the distance between two neighboring harmonics for λ = 400 nm is 3.1 eV, the harmonics neighboring the resonant one (i.e., the 15th harmonic for Cr + and the 17th harmonic for Mn + ) are, in fact, outside of the Fano profile region. However, the resonant enhancement of the central harmonics is clearly visible in both panels in Fig.…”

New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

“…The enhancement of a single harmonic can be attributed to the broadband resonances of the ions of few metals, such as V, In, Cd, Cr, Cd, and Mn. These "giant" resonances have been experimentally confirmed in the literature [26,28,29] and discussed recently in a few theoretical studies [7,[30][31][32]. However, in previous studies using multi-cycle pulses, the intensity of enhanced harmonics was only a few times higher compared with those neighboring harmonic orders.…”

“…The same can be said about the photoionization or photoabsorption characteristics of Mn + plasma, which are due to the "giant" 3p → 3d resonance [28]. The laser polarization dependence of this emission was analyzed and it was found that the 50 eV radiation abruptly decreases with the change of the polarization state of the femtosecond driving pulses from linear to elliptical, which is a clear signature of the emission being due to high-order harmonic generation.…”

3pphotoabsorption spectra ofMn2+andMn3Kilbane1, Mayo2, Kampen3 et al. 2007Phys. Rev. A1010View full textAdd to dashboardCite

“…EUV photoabsorption and photoion spectra of ions of chromium (Costello et al [1], McGuinness et al [2,3], West et al [4]), manganese (Cooper et al [5], Costello et al [1], Kjeldsen et al [6]) and iron (Kjeldsen [7]) and theoretical studies by Dolmatov [8][9][10][11][12] and Donnelly [13][14][15][16] gave rise to significant debate. A recent photoabsorption experiment by Kilbane et al [17] confirmed Dolmatov's predictions [9], that between Mn + and Mn 2+ , not only do the 3p-4s resonances swap over to the high energy side of the giant 3p-3d resonance but also that this reordering has significant effects on the resonance profiles.…”