Source Type
Bending magnet
Optical System
Mirror #1: Copper planar mirror coated with electroless nickel, overcoated with gold; not adjustable; at normal incidence angle; deflects beam 90 degrees down from horizontal; located 2.5 meters from the source.
Mirror #2: Pyrex off-axis ellipsoid mirror coated with aluminum, over coated with magnesium fluoride; reflects the beam horizontally, perpendicular to the original beam, thereby erecting it. Predominant polarization is vertical; at normal incidence angle; steerable via remote controls; focal point at entrance slits of monochromators; located 2.7 meters from the source.
Experimental Apparatus
Vacuum Excitation:
Vacuum Spectrometer: One-half meter Czerney-Turner single grating vacuum monochromator dedicated to vacuum spectrometer; operates at high vacuum [10-7 Torr] and separated from UHV by calcium floride window; 1200 grooves/mm holographic quartz grating coated by aluminum, over coated by magnesium floride; 0 - 3 mm independent entrance and exit slits; located 3.9 meters from the source.
Fluorescence Spectroscopy (steady state and time-resolved): 220 mm single torodial grating emission vacuum monochromator; thermostated sample holder from -10 degrees to 90 degrees C; cryostat from -172 degrees to 20 degrees C; and a cryogenic refrigerator system for temperatures down to 12 K.
Circular Dichroism and Absorption Spectroscopy: A calcium fluoride photoelastic modulator, vacuum in sample chamber to 0.001 Torr, sample thermal control from -10 degrees to 90 degrees C.
Air Excitation:
Air Spectrometer (purged with dry N2): 227 mm focal length double grating spectrometer; wavelength range (220 - 1000 nm); 0 – 2 mm entrance and exit slits.
Simultaneous Time-Resolved Fluorescence (Omnilyzer): Position sensitive photomultiplier for simultaneous measurement of time-resolved fluorescence and polarization across emission spectrum.
Computer System Hardware & Software
Pentium III Industrial PC with ~8 PCI slots running Microsoft Windows for beamline control and data collection. Remote Linux data storage server with dual Pentium processors and many-GigaByte hard drives; Canberra single board MCA dedicated to time resolved fluorescence and MPA to collect F(t,lambda) data from position sensitive photomultiplier.