This article reports on the highhyphen;resolution performance of the grazinghyphen;incidence plane grating monochromator SX700/II, installed at BESSY by the Freie Universitauml;t Berlin, in the photon energy range from about 40 to 900 eV. The high resolving power up to 10thinsp;000 achieved with this monochromator is based on improving the figure error of the ellipsoidal focusing mirror, on reducing the vertical dimension of the beam source, and on employing a 5hyphen;mgr;m exit slit. We report on highhyphen;resolution gashyphen;phase studies in the doublehyphen;excitation region of He, as well as at corehyphen;excitation thresholds of Ne, Ar, Kr, and Xe in the photonhyphen;energy range from bartil;45 eV to bartil;900 eV. In addition, highhyphen;resolution corehyphen;excitation spectra at theKthresholds of C, N, and O are presented for gashyphen;phase CO, N2, and O2. In all cases, highhyphen;nRydberg states and/or vibrational sidebands of the electronic excitations were resolved. The various contributions to the present instrumental linewidths are discussed as well as the prospects for further improvements in resolution with this monochromator.
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