title: In situ calibration of an extreme ultraviolet spectrometer for attosecond transient absorption experiments.
abstract: We report a method for calibrating an extreme ultraviolet spectrometer based on a flat-field grazing incidence spherical grating in the energy range of 20-30 eV. By measuring absorption lines corresponding to singly excited states in helium atoms and autoionizing states in argon atoms, the photon energy of the detected light was determined. The spectral resolution of the spectrometer, 60 meV, was obtained by deconvolving the Fano resonance profile of argon autoionizing states from the measured absorption line profiles.
authors: Department of Physics, National University of Defense Technology, Changsha, Hunan 410073, China.
authors: Xiaowei
authors: X
authors: Wang
authors: Michael
authors: M
authors: Chini
authors: Yan
authors: Y
authors: Cheng
authors: Yi
authors: Y
authors: Wu
authors: Zenghu
authors: Z
authors: Chang