Versatile spectrometer for experiments using synchrotron radiation at wave-lengths greater than 100 nm

Most applications of synchrotron radiation (SR) have been in the extreme ultraviolet and X-ray spectral domains, i.e. wave-lengths less than 100 nm. In the spectral region longward of 100 nm, SR may also be superior to other sources for certain experiments. To date, SR above 100 nm has been exploited most extensively by fluorescence lifetime measurements. Experiments such as circular dichroism, magnetic circular dichroism, various emission spectroscopies and photoacoustic spectroscopy can also use to advantage the high intensity, continuous tunability, short term stability and polarization provided by SR. We have constructed a versatile spectrometer capable of performing the experiments mentioned above and suitable for use to wavelengths less than 130 nm. It will be operated at the SURF II (NS) ring pending completion of the NSLS at Brookhaven National Laboratory. In addition, we describe a modular computer system which will be used to control the operation of and collect and process spectral data from this spectrometer system.