Spectroscopy Quiz

Which electromagnetic region is used in rotational spectroscopy?

• Infrared

• Microwave

• Visible

• X-ray

The zero-point energy of a system is:

• The energy of the system at absolute zero temperature

• The minimum vibrational energy of a molecule

• The energy of the first excited state

• The energy associated with electronic transitions

X-rays are primarily used to study:

• Molecular rotations

• Molecular vibrations

• Electronic transitions in inner shells

• Surface phenomena

Which spectroscopic technique is sensitive to changes in polarizability?

• Infrared spectroscopy

• Raman spectroscopy

• UV-Vis spectroscopy

• Microwave spectroscopy

The selection rule for vibrational transitions in infrared spectroscopy is:

• ΔJ = ±1

• Δv = ±1

• Δv = ±2

• ΔJ = 0

The difference between Stokes and anti-Stokes lines in Raman spectroscopy is due to:

• The energy of scattered photons

• The rotational state of the molecule

• The direction of the scattering

• The frequency of incident radiation

Which transition corresponds to the P branch in a vibration-rotation spectrum?

• ΔJ = 0

• ΔJ = +1

• ΔJ = -1

• ΔJ = ±2

The rotational constant B for a diatomic molecule is directly proportional to:

• Mass of the molecule

• Bond length

• Inverse of moment of inertia

• Vibrational frequency

What distinguishes a symmetric top molecule from a linear molecule?

• Symmetric tops lack dipole moments

• Linear molecules have two equal moments of inertia

• Symmetric tops have two equal and one distinct moment of inertia

• Linear molecules exhibit Raman but not IR spectra

In rotational spectroscopy, the energy difference between levels is proportional to:

• J(J+1)

• J²

• J+1

• J³