A-Branch: NAPA

Key Performance

Overview

Branch A (NAPA) is a Near Ambient Pressure X-ray Photoelectron Spectroscopy (APXPS) endstation optimized for in-situ investigations of solid-gas phases under diverse atmospheric and reaction conditions. Equipped with a custom-designed four-stage differential pumping system featuring a Si3N4 window (available), it enables vacumm transition between the KB chamber and the analysis chamber. This endstation aims to expand the application range of APXPS through the design of rapidly switchable small chambers, and covers a broad X-ray energy range from 180 eV to 2500 eV—facilitating comprehensive surface characterization.

I. Preparation chamber

  -6 samples can be loaded (flag-type sample plate)

  -sample can be treated between 150 K to 1300 K;

  -Argon sputtering;

  -evaporator positions and ports for user equipment available;

II. Switchable chamber

  -small volume and rapidly switchable, customized according to users

 -Integrated laser heating and resistance heating sample holder, with a temperature range of 300 K to 1300 K

- 6 gas lines equipped with individual mass flow controllers (MFCs) 

III. UHV chamber

　Traditional surface science analysis in high vacuum under 150~1300 K.

B-Branch: MARS

Key Performance

Overview

Branch B is an in-situ photon-in photon-out spectroscopy endstation (MARS), designed to collect X-ray absorption spectroscopy (XAS), X-ray emission spectroscopy (XES), and resonant inelastic X-ray scattering (RIXS) pectroscopy . This suite of techniques probes both unoccupied and occupied electronic structures, as well as elementary excitations—including crystal field splitting, charge transfer, and excitations related to spin, charge, orbital, and lattice degrees of freedom. The endstation operates over a broad X-ray beam energy range from 180 eV to 1800 eV and is equipped with in-situ capabilities, enabling detailed investigation of electronic structure and dynamics in complex materials.

I. Loadlock 

   Up to 20 samples can be loaded (flag-type sample plate);

II. Prepare chamber

   sample can be heated up to 1200 K;

   4 evaporator positions available once requested;

III. Main chamber

　 In-situ atmosphere up to 1 bar maximum;

IV. Spectrometer

      30 meV energy resolution and 3 um spatial resolution。