Which of the following statements are correct when describing Raman spectroscopy? (There can be one or more correct answers)
It is based on Raman scattering/Raman effect, meaning monochromatic radiation is scattered by molecules and part of it changes frequency, which can be detected.
It is a scattering technique, meaning samples are placed on the path of a laser beam and the backscattered radiation is analysed.
It gives out vibrational spectra just like infrared spectroscopy, but the spectra are not the same.
The two primary disadvantages are fluorescent background and decomposition of many materials by the intense laser irradiation.
Which of the following are advantages of using visible laser, as opposed to NIR laser, for exciting Raman spectrum? (There can be one or more correct answers)
There is less danger to excite fluorescence with a visible laser than with NIR laser.
Raman scattering is more intense when the excitation wavelength is shorter.
Lower laser power can be used.
Signal-to-noise ratio of the obtained spectrum is better.
The obtained spectrum does not have interference from fluorescence.
In which of the following analysis tasks would you consider using Raman spectroscopy? (There can be one or more correct answers)
Binder in a small painting sample
Natural dyes used for dyeing a small piece of textile
Filler (e.g. chalk) in a paper sample
Type of fibre of a non-dyed textile
Inorganic pigment in a small painting sample
Elemental composition of a mortar
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