The vacuum ultraviolet beamline/endstations at   NSRL dedicated to combustion research

An undulator-based vacuum ultraviolet (VUV) beamline (BL03U), intended for combustion chemistry studies, has been constructed at the National Synchrotron Radiation Laboratory (NSRL) in Hefei, China. The beamline is connected to the newly upgraded Hefei Light Source (HLS   II), and could deliver photons in the 5 – 21   eV range, with a photon flux of 1013   photons   s − 1 at 10   eV when the beam current is 300   mA. The monochromator of the beamline is equipped with two gratings (200   lines mm − 1 and 400   lines mm − 1) and its resolving power is 3900 at 7.3   eV for the 200   lines mm − 1 grating and 4200 at 14.6   eV for the 400   lines mm − 1 grating. The beamline serves three endstations which are designed for respective studies of premixed flame, fuel pyrolysis in flow reactor, and oxidation in jet-stirred reactor. Each endstation contains a reactor chamber, an ionization chamber where the molecular beam intersects with the VUV light, and a home-made reflectron time-of-flight mass spectrometer. The performance of the beamline and endstations with some preliminary results is presented here. The ability to detect reactive intermediates (e.g. H, O, OH and hydroperoxides) is advantageous in combustion chemistry research.
Source: Journal of Synchrotron Radiation - Category: Physics Authors: Tags: VUV beamline combustion premixed flame flow reactor beamlines Source Type: research