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Question 1:

Raman spectrometry is a technique used to measure the scattering of which type of radiation?

A) Ultraviolet (UV) radiation
B) Visible light
C) Infrared (IR) radiation
D) X-ray radiation

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Explanation: The correct answer is C) Infrared (IR) radiation. Raman spectrometry involves the measurement of the inelastic scattering of IR radiation by molecules. The Raman effect, named after C. V. Raman who discovered it, provides valuable information about molecular vibrations and structural characteristics of a sample.

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Question 2:

What is the principle behind Raman spectrometry?

A) Scattering of light
B) Reflection of light
C) Absorption of light
D) Refraction of light

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Explanation: The correct answer is A) Scattering of light. Raman spectrometry is based on the principle of inelastic scattering of light. When a sample is illuminated with a monochromatic light source, a small fraction of the scattered light undergoes a shift in energy due to molecular vibrations, resulting in the Raman scattering. By analyzing the energy shifts, Raman spectroscopy provides valuable information about molecular vibrations and chemical bonds.

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Question 3:

Which of the following is true about Raman spectrometry?

A) It measures the absorption of light by a sample
B) It requires a spectrophotometer with only UV capabilities
C) It is limited to solid samples only
D) It provides information about the electronic structure of a sample

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Explanation: The correct answer is D) It provides information about the electronic structure of a sample. Raman spectrometry is highly useful in providing information about molecular vibrations and rotational states, which are related to the electronic structure of a sample. This technique can be applied to various sample types, including liquids, solids, and gases.

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Question 4:

What is the instrument used to perform Raman spectrometry called?

A) Spectrophotometer
B) Raman microscope
C) Electron microscope
D) Raman spectrometer

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Explanation: The correct answer is D) Raman spectrometer. A Raman spectrometer is the instrument used to perform Raman spectrometry. It typically consists of a laser as the light source, a spectrometer to analyze the scattered light, and a detector to measure the Raman scattering signal. Raman spectrometers can have different configurations, including benchtop models and portable handheld devices.

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Question 5:

What is the difference between Stokes and anti-Stokes Raman scattering?

A) Stokes Raman scattering is associated with a higher-energy shift compared to anti-Stokes Raman scattering
B) Stokes Raman scattering is associated with a lower-energy shift compared to anti-Stokes Raman scattering
C) Stokes Raman scattering occurs at longer wavelengths compared to anti-Stokes Raman scattering
D) Stokes Raman scattering occurs at shorter wavelengths compared to anti-Stokes Raman scattering

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Explanation: The correct answer is B) Stokes Raman scattering is associated with a lower-energy shift compared to anti-Stokes Raman scattering. Stokes Raman scattering occurs when the scattered light undergoes a shift to lower energy (longer wavelength) compared to the incident light. In contrast, anti-Stokes Raman scattering occurs when the scattered light undergoes a shift to higher energy (shorter wavelength) compared to the incident light. Both Stokes and anti-Stokes Raman scattering provide valuable information about the vibrational modes and energy levels of a sample.