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Photoionization - Quiz
Contributed by: Bannister
  • 1. What is the physical process where an ion is formed from the interaction of a photon with an atom or molecule?
A) Photoionization
B) Photoelectric effect
C) Nuclear fission
D) Chemical synthesis
  • 2. What term describes the probability of an ionization event conceptualized as a hypothetical area?
A) Ionization threshold
B) Quantum tunneling coefficient
C) Photoionization cross section
D) Electronic transition probability
  • 3. What two primary factors influence the photoionization cross section?
A) Electron mass and nuclear charge
B) Magnetic field and pressure
C) Photon energy and species structure
D) Laser intensity and temperature
  • 4. How can the photoionization cross-section for molecules be estimated?
A) By calculating the AC Stark effect
B) By determining the wavelength of the ground state
C) By examining Franck-Condon factors
D) By measuring tunneling rates
  • 5. What is the approximate photoionization cross-section for photon energies below the ionization threshold?
A) Near zero
B) Negligible but increasing
C) One hundred percent
D) Constant
  • 6. Which software is mentioned as a tool for computing molecular vibrations for cross-section estimation?
A) Gaussian
B) Matlab
C) QChem
D) AutoCAD
  • 7. What happens to the ionization probability as the number of photons required for multi-photon ionization increases?
A) It decreases rapidly
B) It increases exponentially
C) It becomes independent of intensity
D) It stays constant
  • 8. In the perturbative regime, the probability of absorbing N photons depends on laser intensity (I) as:
A) I multiplied by N
B) I to the power of N
C) The log of I
D) The square root of I
  • 9. What effect causes the breakdown of the intensity power law in high-intensity multi-photon ionization?
A) AC Stark effect
B) Franck-Condon effect
C) Barrier suppression
D) Quantum interference
  • 10. What is the full name of the REMPI spectroscopy technique?
A) Rapid-energy multi-photon induction
B) Resonance-enhanced multiphoton ionization
C) Rotational-enhanced molecular photon ionization
D) Resonant-electron multi-photon intensity
  • 11. What does REMPI use to access an excited intermediate state?
A) A tunable laser
B) X-ray bombardment
C) An electron beam
D) A constant magnetic field
  • 12. What is the primary characteristic of Above-threshold ionization (ATI)?
A) Absorption of fewer photons than the threshold
B) Complete cessation of photon absorption
C) Emission of protons instead of electrons
D) Absorption of more photons than necessary for ionization
  • 13. In ATI, how is the kinetic energy of the released electron affected?
A) It is reduced by the photon energy
B) It is higher than in threshold ionization
C) It remains exactly at zero
D) It is lower than in threshold ionization
  • 14. What feature appears in the photoelectron spectrum of an ATI system?
A) A single continuous line
B) A decay curve
C) No spectral peaks
D) Multiple peaks separated by photon energies
  • 15. What phenomenon occurs at intensities around 1015 to 1016 W/cm2?
A) Spontaneous emission
B) Non-perturbative phenomena like barrier suppression
C) Molecular dissociation only
D) Linear absorption
  • 16. What happens to the atomic potential in tunnel ionization?
A) It is distorted to create a narrow barrier
B) It remains perfectly symmetric
C) It becomes infinite
D) It disappears entirely
  • 17. Which term describes the process where an electron overcomes the barrier due to large potential distortions?
A) Above-threshold ionization
B) Tunnel ionization
C) Resonance-enhanced ionization
D) Over-the-barrier ionization
  • 18. What conditions favor tunnel ionization over multi-photon ionization?
A) High pressure
B) Lower temperature
C) Increased laser intensity or longer wavelength
D) Decreased intensity and shorter wavelength
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