Spectroscopy 1 Overview
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Questions and Answers

What is the purpose of a spectrometer?

  • To generate X-ray radiation
  • To determine the electron density in a molecule
  • To analyze the crystal structure of compounds
  • To perform measurements of spectral data (correct)

    • In UV-visible spectroscopy, what happens if a particular electronic transition matches the energy of a certain band?

  • The transition will be absorbed (correct)
  • The molecule becomes fluorescent
  • The sample becomes transparent to UV-visible radiation
  • The transition will be reflected instead of absorbed

    • What type of electronic transitions are observed from the molecular orbital diagram?

  • Transitions from s to s* orbitals only
  • Transitions from n to s* and p* orbitals primarily
  • Transitions from p to p* orbitals exclusively
  • Transitions from occupied to unoccupied orbitals (correct)

    • Which rule states that during an electronic transition, the total spin of the molecule cannot change?

    <p>Selection Rule 1 (Spin selection rule)</p> Signup and view all the answers

    What is the outcome of a singlet to singlet electronic transition based on the Spin selection rule?

    <p>It leads to the absorption of light</p> Signup and view all the answers

    What is obtained from the residual radiation after UV-visible irradiation in spectroscopy?

    <p>Absorption spectrum with gaps at discrete energies</p> Signup and view all the answers

    What is the main purpose of fluorescence spectroscopy?

    <p>Analyzing the optical properties of a sample</p> Signup and view all the answers

    Which technique involves using X-rays to determine the crystal structure of a material?

    <p>X-ray spectroscopy and crystallography</p> Signup and view all the answers

    What process involves atoms in a sample absorbing energy and then emitting it as light at characteristic wavelengths?

    <p>Atomic emission spectroscopy</p> Signup and view all the answers

    Which technique is specifically used for determining the mass-to-charge ratio of ions in a sample?

    <p>Mass spectroscopy</p> Signup and view all the answers

    Infrared spectroscopy is primarily utilized for what purpose in the study of materials?

    <p>Investigating molecular vibrations and functional groups</p> Signup and view all the answers

    Which technique involves measuring how materials interact with electromagnetic radiation in the ultraviolet and visible regions?

    <p>UV-Visible spectroscopy</p> Signup and view all the answers

    What is the relationship between singlet and triplet states based on the text?

    <p>Forbidden</p> Signup and view all the answers

    According to Rule 2 (Laporte selection rule), which type of electronic transitions are allowed for a centrosymmetric molecule?

    <p>s-p, p-d, d-f transitions</p> Signup and view all the answers

    In UV-Visible spectroscopy, what type of transition occurs for n->p* and p->p*?

    <p>Low energy transition</p> Signup and view all the answers

    What is the purpose of the dispersion device in a spectrophotometer?

    <p>To select the required wavelength</p> Signup and view all the answers

    Which type of lamp is used to cover the UV region in a spectrophotometer?

    <p>Deuterium arc lamp</p> Signup and view all the answers

    In fluorescence spectroscopy, what happens to the wavelength shifts with polar solvents?

    <p>Shift to longer wavelengths</p> Signup and view all the answers

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