Layout of the VLS-PGM beamline. FM, fixed mask; M1, plane mirror; M2, toroidal mirror; M3, spherical mirror; M4, plane mirror; M5 and M6, toroidal refocusing mirrors.
(Color online) Grating to exit slit distance at focus for the three gratings.
(Color online) Calculated resolving power with the delivered optics when both entrance and exit slits are set to 10, 20, and , respectively. The solid lines represent the “optimal” resolving power at a slit when the exit slit tracks the photon energy focus. The total exit slit displacement is .
(Color online) Ar double excitation spectra recorded with slit settings of using (a) the low energy grating and (b) the medium energy grating.
(Color online) Photoabsorption spectrum of Ar recorded with slit settings of . The relative intensity of higher energy peaks (toward ) is weaker than those reported in literature (e.g., Ref. 11), as the simple normalization could not compensate for the steep loss of the flux in this energy range (Fig. 7).
Photoabsorption spectrum of the P region of . The detail of the P Rydberg region is shown in the inset, where the three vertical-bar diagrams represent the energy postions and intensities of Rydberg transitions converging toward the spin-orbit and ligand field split P ionizations, and the solid subspectra show the vibrational progressions due to the P–F stretching. For details, see Ref. 14.
(Color online) Photon fluxes of both branches using the three gratings with slit settings of , normalized to ring current.
Specified and delivered radii of the important optics.
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