Raman, NIR, IR Spectroscopy
Studying the spectral behavior of a material when exposed to a wide band of radiation is a fundamental experimental tool for understanding it’s intrinsic properties and potential uses. ARS builds cryostats that are tailored to the key needs of these sensitive experiments and improve data output with low temperatures, high vacuum, and ultra-low vibrations.
Cryogenic Mössbauer Spectroscopy directs a beam of gamma radiation onto a cold sample. This will reveal novel behavior with narrow spectral bands such as isomer shift, magnetic hyperfine splitting, and quadrapole splitting.
Exposing the sample to a high power magnetic field will help to further reveal hyperfine splitting of spectral peaks into sextets, achieved with superconducting magnets that can be integrated into the cryostat.
This is a very sensitive technique that requires minimal mechanical vibrations and high dimensional stability while focusing the beam on the sample. This can be achieve using ultra-low vibration cryostats such as the µDrift, Helitran, or Omniplex cryostats from ARS.
Angle-Resolved Photoemission Spectroscopy (ARPES)
ARPES uses x-rays fired at a sample to observe the surface structure a solid as the excited particles escape from the sample and are collected by a electron detector. Cooling the sample will minimize thermal broadening of the spectral peaks during the experiment.
Using an angle resolved setup is useful particularly for studying the surfaces of 2d materials where the reflection angles are nearly parallel to the surface.
High Quality vacuum, up to UHV bakeable chambers are essential for maintaining surface and detector cleanness. The light source is generally directed from a laser or synchotron.
Fourier-transform infrared spectroscopy (FTIR)
Infrared Radiation is passed through a sample to observer what frequencies are passed or reflected by the sample.
The mirror used to direct the light inside the spectrometer can be oscillated and can deliver amplitude information about the sample’s behavior after data is passed through a Fourier Transform.
Using a magnetic field and a RF or light source to excite the sample can reveal magnetic properties of nuclei and their resonant frequency bands.
In a low temperature environment these bands narrow for easier measuring and collection of data from the sample.
Usually performed in high magnetic fields, ARS cryostats can be customized for very small bores while retaining ideal optical access.
Using light directed at a sample, material properties such as surface roughness, dielectric function, and other can be measured by a collector after being reflected and polarized by the sample. Performing this experiment in cryogenic vacuum can improve collection rate and reduce noise when measuring the sample.