"Momentum-resolved resonant inelastic soft X-ray scattering (qRIXS) endstation at the ALS"

Yi-D eChuang: Xuefei Feng, Alejandro Cruz, Kelly Hanzel, Adam Brown, Adrian Spucces, Alex Frano, Wei-Sheng Lee, Jaemyung Kim, Yu-Jen Chen, Brian Smith, John S. Pepper, Yu-Chen Shao, Shih-Wen Huang. Andrew Wray, E. Gullikson, Zhi-Xun Shen, Thomas P. Devereaux, Anton Tremsin, Wanli Yang, Jinghua Guo, Robert Duarte, Zahid Hussain; Journal of Electron Spectroscopy and Related Phenomena, 10/19/19.

Additional Authors: Xuefei Feng, Alejandro Cruz, Kelly Hanzel, Adam Brown, Adrian Spucces, Alex Frano, Wei-Sheng Lee, Jaemyung Kim, Yu-Jen Chen, Brian Smith, John S. Pepper, Yu-Chen Shao, Shih-Wen Huang. Andrew Wray, E. Gullikson, Zhi-Xun Shen, Thomas P. Devereaux, Anton Tremsin, Wanli Yang, Jinghua Guo, Robert Duarte, Zahid Hussain

Abstract:

A momentum resolved resonant inelastic X-ray scattering (qRIXS) experimental station with continuously rotatable spectrometers and parallel detection is designed tooperate at different beamlines at synchrotron and free electron laser (FEL) facilities. This endstation, currently located at the Advanced Light Source (ALS), has five emission ports on the experimental chamber for mounting the high-throughput modular soft X-ray spectrometers (MXS) [24]. Coupled to the rotation from the supporting hexapod, the scattered X-rays from 27.5° (forward scattering) to 152.5° (backward scattering) relative to the incident photon beam can be recorded, enabling the momentum-resolved RIXS spectroscopy. The components of this endstation are described in details, and the preliminary RIXS measurements on highly oriented pyrolytic graphite (HOPG) reveal the low energy vibronic excitations from the strong electron-phonon coupling at C Kedge around σ* band. The grating upgrade option to enhance the performance at low photon energies is presented and the potential of this spectroscopy is discussed in summary.