Raman spectroscopy is a very useful standard tool for the analysis of organic and inorganic materials, and nowadays its applications range from material to life sciences. Raman spectroscopy enables a contact-less and destruction-free analysis of materials with high spatial resolution, is applicable in various environments (like ambient, vacuum, reactive gases, liquids) and may thus be used for in-situ and operando spectroscopy as well. However, the small cross section of Raman scattering is a serious drawback in many applications, in particular if very small sample volumes have to be probed like thin layers, quantum structures or single molecules. However, in many cases such as wide-bandgap-semiconductor structures or small organic molecules, the Raman cross section increases by several orders of magnitude if UV or DUV laser excitation is applied.
In the framework of the UV-DUV-Raman application lab a novel, improved instrumentation for UV-DUV spectroscopy is realized in collaboration with LTB GmbH and operated for research in ISAS as well as for collaboration projects with external partners. The Raman equipment consists of a variable triple grating spectrograph with microscope stage and xy-scanning stage (Jobin Yvon, T64000), and, in addition, newly developed Echelle spectrographs for the UV and DUV spectral range. The new spectrographs provide a high transmission accompanied with a high spectral resolution of down to 1.5 cm-1. Various cw-laser sources at 220 nm, 266 nm, 355 nm, 440 nm and 532 nm are available, and an optical microscope with xy-stage can be coupled to the different laser sources, the standard spectrograph and the Echelle spectrographs. Moreover, for the analysis of biomolecules ,dedicated liquid cells enabling an analyte flow are available.