U12IR
NSLS Very Far Infrared / THz
Beamline
Description and Capabilities
NOTE: This Page Is Under Construction
INSTRUMENTATION
The U12IR Beamline is intended
primarily for Far Infrared Spectroscopy, spanning the spectral range
from about 6 cm-1 up to 600 cm-1.
The beamline and spectrometer system are actually capable of providing
spectra to over 4000 cm-1, but other NSLS
beamlines are better optimized for exploiting high-brightness
synchrotron radiation in the mid-infrared, e.g. U10A and U10B
The beamline's primary spectrometer is
a Bruker IFS 125HR will 9 "modules" to achieve a resolution approaching
0.001 cm-1. Principal beamsplitters are 125
µm thick mylar for the 5 to 25 cm-1
range, and a Ge coated 6 µm thick mylar for the 20 to 600 cm-1
range. A 1.5K large aperture bolometer and 4.2K standard
bolometer serve as detectors. The spectrometer is owned by Stony
Brook University.
The spectrometer is available to all
Users granted beamtime through the NSLS General User system.
Liquid N2 and
liquid He
for the IR detectors are provided by the NSLS at no charge to the
User. Users must provide liquid He for other cryostats.
On-site staffing is less than 1 person per infrared beamline. Training to operate the beamline
will be provided. However, Users are expected to have FTIR
spectroscopy experience and knowledge of the particular measurement
method (transmission, reflection, grazing incidence, ATR) and bring
sufficient staff to perform most tasks associated with a typical
laboratory experiment.
The scientific team that operates the
beamline and instrumentation (Stony Brook Univ., Univ. of Florida and
the NSLS) conducts a research program that includes the study of
materials at low temperatures, high magnetic fields, and dynamics on a
sub-nanosecond time scale. Such measurements utilize additional
instruments not listed as part of the beamline's standard spectroscopy
instrumentation. Since the scientific team members can not
provide training for these instruments, thy are typically not available
to General Users. Exceptions can be made for particular
scientific teams that have relevant experience and demonstrated
expertise with such instruments (e.g., heli-tran type cryogenic
systems). Users desiring access to this instrumentation should
contact the relevant team member.
STANDARD INSTRUMENTS
Bruker IFS 125HR Interferometer with
dual sample compartments
1.5K bolometer, 5 to 100 cm-1
4.2K bolometer, 20 to 600 cm-1
OTHER INSTRUMENTS
INSTITUTION / CONTACT
Oxford 14/16T vertical bore magnet
with optical access (5 to 200 cm-1)
Sample insert from <2K to 300K
Prof. Laszlo Mihaly
Physics - Stony Brook Univ.
laszlo.mihaly@sunysb.edu
1.
2.
Oxford Optistat Bath flow/immersion
optical cryostat. T=1.8K to 300K. Sapphire or ZnSe cold windows.
Dr. Larry Carr
NSLS - Brookhaven Nat'l Lab
carr@bnl.gov
-- or --
Prof. David Tanner
Physics - Univ. of Florida
tanner@phys.ufl.edu
3.
ARS Heli-tran open flow cryostat.
Vacuum shroud with far-IR polyethylene windows.
4.
Mode-locked Ti:sapphire laser, 730 nm
to 900 nm tuning range. Picosecond pulse duration, pulse selection and
synchronization to match 52.88 MHz PRF of NSLS storage rings.
PERFORMANCE
Transmitted signal through the
spectrometer when a small (low pressure) of atmosphere is introduced,
showing the 18.585 cm-1 absorption feature of
water vapor. The absorption width is measured to be about 0.02 cm-1.
