Absolute photoionization cross sections with ultra-high energy resolution for Ar, Kr, Xe and N2 in inner-shell ionization regions

Linac Coherent Light Source soft x-ray materials science instrument optical design and monochromator commissioning

“…The xenon pressure was 500 mTorr. This spectrum contains an isolated resonance 3d −1 5/2 -6p, for which Kato et al 16 natural linewidth, we infer an instrumental resolution of 1/3200 for the 100 l/mm grating at this photon energy. Different M1 pitch angles are required to optimize the monochromator focusing for the zero order and for the first order of the 100 and 200 l/mm gratings.…”

Resonant Auger decay of Ar2p3/2−14sand2pParipás1, Palásthy2, Štuhec3 et al. 2010Phys. Rev. A4000View full textAdd to dashboardCite

“…4 for different values of the momentum transfer. While the velocity form approximately reproduces the 4s 3/2 :3d 3/2 line intensity ratio in the optical limit [29], the length form strongly underestimates this ratio, and GOS for 2p → 4s 3/2 transition is below the value of 7.84 × 10 −3 , calculated by the configuration interaction PWBA approach in the optical limit [26]. The Hartree-Fock 4 s orbital therefore more accurately describes the wave function close to the nucleus than in the outer atomic region.…”

“…According to Shaw et al [23], this is a reasonable assumption until E 0 > 350 eV, but our experimental setup detects scattered electrons at much larger angles where the importance of the exchange interaction is expected to increase. As shown by the photoabsorption data [29], the spin-orbit effect is mainly manifested by 2p 3/2 -2p 1/2 energy splitting, and relative intensities of corresponding lines obey the statistical ratio of 2:1 well. However, to describe the excitation strengths of overlapping resonances with different total angular momentum J more accurately (that populate different final states by the Auger decay), we have employed distorted-wave Born approximation (DWBA) with exchange [32].…”

Present Status of a New Vacuum Ultraviolet and Soft X-Ray Undulator Beamline BL-13A for the Study of Organic Thin Films Adsorbed on Surfaces

“…The solid lines in the upper panel represent thê tting curves using Voigt functions, where the natural lifetime width is taken to be 113 meV 18) . The Gaussian width obtained from theˆtting is 39.96 meV.…”

“…7). The spectrum wasˆtted using Voigt functions, where the natural lifetime width was taken to be 113 meV 18) . Using the Gaussian width obtained from the curveˆtting, E/DE was estimated to be about 10,000 at a photon energy of 401.1 eV.…”