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2014 | OriginalPaper | Buchkapitel

2. Background

verfasst von : Nils Olaf Bernd Lüttschwager

Erschienen in: Raman Spectroscopy of Conformational Rearrangements at Low Temperatures

Verlag: Springer International Publishing

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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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Vorheriges Kapitel Introduction

Nächstes Kapitel Experimental

http://www.nobelprize.org/nobel_prizes/physics/laureates/1930/raman-lecture.pdf

(21 September 2013).

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.

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.

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.

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.

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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Titel: Background
verfasst von: Nils Olaf Bernd Lüttschwager
Verlag: Springer International Publishing
Buch: Raman Spectroscopy of Conformational Rearrangements at Low Temperatures
Print ISBN: 978-3-319-08565-4

Electronic ISBN: 978-3-319-08566-1

Copyright-Jahr: 2014
DOI: https://doi.org/10.1007/978-3-319-08566-1_2

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