Raman Spectroscopy Questions

Which type of scattering are we most interested in when interpreting Raman data?

• Rayleigh scattering

• Stokes scattering

• Anti-Stokes scattering

• Both Stokes and anti-Stokes scattering

What distinguishes Raman spectroscopy from infrared (IR) spectroscopy?

• Raman measures absorption, while IR measures scattering

• Raman measures scattering, while IR measures absorption

• Raman and IR measure the same interactions

• Raman spectroscopy measures Stokes scattering, while IR measures anti-Stokes scattering

What is the main advantage of Raman spectroscopy in forensic science?

• It requires large sample sizes

• It is non-destructive

• It works only on organic materials

• It requires sample dissolution

Which type of light is commonly used in Raman spectroscopy?

• X-rays

• Infrared

• UV

• Visible

Which of the following correctly describes the relationship between wavelength (λ), frequency (ν), and energy (E) of electromagnetic radiation?

• As wavelength increases, frequency increases, and energy decreases

• As wavelength increases, frequency decreases, and energy decreases

• As wavelength increases, frequency increases, and energy increases

• As wavelength decreases, frequency decreases, and energy increases

Why are different laser wavelengths used in Raman spectroscopy?

• To adjust for fluorescence interference

• To analyse different types of samples

• To optimise signal intensity

• All of the above

Which forensic sample is best analysed using Raman micro-spectroscopy?

• Large metal objects

• Small particles like fibres and paint fragments

• Water samples

• Bulk plastic materials

What is the key feature of handheld Raman spectrometers for forensic analysis?

• They require extensive sample preparation

• They allow on-site, non-destructive analysis

• They are ineffective in crime scene investigations

• They only work with liquid samples

Why does Raman spectroscopy work well for analysing water-based samples?

• Water strongly absorbs Raman signals

• Water has weak Raman scattering, minimising interference

• Raman spectroscopy cannot analyse water-based samples

• Water fluoresces strongly, enhancing Raman peaks

What is the significance of the Raman shift in forensic analysis?

• It helps identify unknown substances based on molecular vibrations

• It measures the fluorescence properties of a substance

• It determines the atomic structure of metals

• It only works for synthetic chemicals