1. Department of Physics, Tohoku University, 980, Sendai, Japan 2. Department of Chemistry, University of Durham, DH1 3LE, Durham, UK 3. Department of Physics, Birkbeck College, Malet Street, WC1E 7HY, London, UK
Abstract:
A fundamental radiometric measurement has been carried out in the spectral region 1–140 cm?1 which demonstrates the higher brightness of the synchrotron radiation source at Daresbury Laboratory over a high pressure mercury arc lamp source. Comparison of the output powers from the SRS and the mercury lamp revealed that the SRS has a particular advantage in the region where the wavelength of the emitted photon becomes very longer. The gain factor of the SRS at 10 cm?1 was at least 10 times of the mercury lamp at a storage ring current of about 90 mA. A single period wiggler is considered to be a favorable device which will provide a higher level of photon fluxes from an electron storage ring in the long wavelength region.