Abstract
This chapter is intended to give general information on Raman spectroscopy and the supersonic jet expansion technique (“Raman jet-spectroscopy”). The goal is to point out aspects that are of particular importance to this work.
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Notes
- 1.
http://www.nobelprize.org/nobel_prizes/physics/laureates/1930/raman-lecture.pdf
(21 September 2013).
- 2.
The differential scattering cross-section is a measure of how much scattered light passes through a unit area perpendicular to the incident beam. The total scattering cross-section, on the other hand, is a measure of how much light is removed from the incident beam.
- 3.
Beside the electric dipole moment, the electromagnetic radiation induces magnetic and higher electric moments, but their effect is several orders of magnitude smaller [1] and can be neglected.
- 4.
This can be rationalized by larger amplitudes (\(q_{k_0}\)) of vibrations in higher excited states, which amplifies the Raman term in Eq. 2.3.
- 5.
This step can be avoided when the polarization of Raman-scattered light is scrambled with a polarization scrambler before it enters the monochromator, but this piece of equipment was not available for the measurements presented here and would have reduced the detection sensitivity for polarized transitions.
- 6.
Measurements were done with two filters: Hama Hoya 450/670 linear polarizing filter or Prinz PO: 012937 polarizing filter. Both yielded the same polarization-dependence within the measurement accuracy (uncertainty of \(\pm 0.1\) in the detection efficiency ratio, see Fig. 2.2).
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Lüttschwager, N.O.B. (2014). Background. In: Raman Spectroscopy of Conformational Rearrangements at Low Temperatures. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-08566-1_2
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