1W2B is a Diffraction, Spectroscopy and Time Resolution beamline and locates at No.15 experimental hall. Originally, it is a Macromolecular Crystallography beam line operating in the 5-18 keV range, with beam spot size of 1mm(H)´0.6mm(V). Recently 1W2B developed the capability of hosting X-ray absorption spectroscopy (XAS) experiments, small-angle X-ray scattering (SAXS) experiments and time resolved experiments. It runs not only in the dedicated mode of synchrotron radiation but also in the parasitic mode.

Transmission XAS with parallel plate ion chamber and fluorescence XAS with Lytle detector is available. Typical time for taking a XAS spectrum is 15 minutes. Quick XAS is also available, which permits several ten seconds minimum to take a spectrum. Advanced self-developed area silicon detector will be equipped in 2018 which will permit spectrum acquisition of much lower concentration samples (approximately several parts per million).

A SAXS system was assembled in June 2016. During the dedicated beam time, we tested the setup of the system and had a trial run. The system began to host users in June 2017. The sample-to-detector distance is adjustable from 0.5 meter to 1.2 meter.

Utilizing laser pump - X-ray probe method, pico-second resolution X-ray absorption spectroscopy and X-ray diffraction method were developed on 1W2B station, which have wide application prospects in photo-chemistry and photo-physics. Ultrafast X-ray absorption spectroscopy began to host users in June 2017.

Supported techniques:

Macromolecular crystallography

Multi-wavelength/Single-wavelength Anomalous Dispersion

Multiple/Single isomorphous replace

Molecular replace

Micromolecule crystallography

X-ray Absorption Fine Structure

Small angle X-ray scattering

Wide angle X-ray scattering

 Pico-second resolution X-ray absorption spectroscopy and X-ray diffraction method

Scopes:

Biological Macromolecular

Organic/Inorganic micromolecule

Beamline equipments

Pilatus 1M detector

Ion Chamber and Lytle detector

Time resolved pump-probe system

Mardtb and Mar 165 CCD

Cryogenic Sample Changer（Marresearch, 18 samples）

Oxford cryogenic freezing system

Cold-light source optical microscope

Beamline Specs

Source                  Wiggler  

Energy Range             5-18 keV

Resolution (ΔE/E)      better than 4×10^-4

Flux (photons/sec)     10¹²

Beam Size (H×V)         1mm×0.6 mm