Absolute photoionization cross-section tables for helium, neon, argon, and krypton in the VUV spectral regions

Net emission coefficients of argon iron plasmas with electron Stark widths scaled to experiments

“…Here, σ 0 , E 0 , y 0 , y 1 , y a , y w and P are fit parameters (Table 1), is the orbital quantum number of the photo electron and E = hc/λ is the photon energy. For neutral argon the photoionization cross section given in [30] is in good agreement with the recommended experimental values given by Marr and West [31].…”

The Absolute Cross Section forL‐Shell Photoionization of C+Ions from Threshold to 105 eV

“…The fraction of second-order radiation was between 0% and 15%, depending on photon energy and undulator-harmonic number. It was determined with a noble-gas double ionization chamber with D0.5 torr He gas, using the two Hec urrents, the known He photoionization cross section (Marr & West 1976), the target gas pressure and the transmission of the Al foil ; the latter was inserted to separate the He gas from the UHV in the rest of the set-up. Most data were recorded using the Ðrst harmonic of the undulator (hl \ 55 eV), and these data have been corrected for the e †ects of second-order radiation, whereas the data recorded using the third harmonic (55È105 eV) are uncorrected.…”

Temporal characterization of attosecond pulses emitted from solid-density plasmas

“…A glass target will result in a significant number of higher energy photons in the interaction region of the AC. As the ionization yield for single-photon ionization of He is roughly five to six orders of magnitude higher than that for the two-photon process for the intensities used in the present experiment [39,40], this will dominate the interaction in the case of a glass target. For comparison the intensity dependence of the ionization of two background gases is shown in figure 3.…”