21A2 U90 - (White Light) Photochemistry


This beamline covers the photon energy ranging from 4 to > 50 eV. It is estimated that the photon flux at the sample position is ~1016 photons/sec with an energy resolution of ~2%. The photon beam is focused by two toriodal CVD-SiC mirrors which face horizontally. Gas cell is placed at the focus point of the first mirror to suppress the higher harmonics. The calculated beam size at sample point is about 1 × 0.06 mm2 (H × V)

This beamline is suitable for experiments requiring high photon flux with low energy resolution. The BL21white light beamline is a gas filtered ultra-high flux with low resolution U9 white-light beamline, providing photon energies from 5 to 50 eV. Two toroidal SiC mirrors are used to focus the photon beam down to 1 × 2 mm. Photon flux of 2 × 1016 has been obtained. Photodissociation, photodesorption, photoionization, or photoluminescence experiments can be conducted possibly in this beam line.

Areas of Research

Photochemistry on photodissociation, photodesorption, photoionization, and photoluminescence of molecules and materials

Light Source

Source SizeHorizontal αh =  mm
Vertical αv =  mm
Energy Range5 ~ 50 eV

Find a Beamline

21A2 Home



BL Schedule

Optical Layout




+886-3-578-0281 Ext. 1210

BL Spokesperson

Wu, Yu-Jong (吳宇中)
+886-3-578-0281 Ext. 7211

BL Manager/Local Contact

Chou, Sheng-Lung (周勝隆)
+886-3-578-0281 Ext. 3356


  • IR/Visible/UV/VUV Spectroscopy


  • Molecular science

General Information

  • Source: U90
  • Energy Range: 5~50 ev
  • Focused Spot Size: 1 × 1 mm
  • Status: Operational

National Synchrotron Radiation Research Center

101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu, Taiwan 30076