Quiz 1
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Out of three internal energy components which one is the largest?
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Electronic
Vibrational
Rotational
Choose the right statement.
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Vibrational levels in the model of harmonic oscillator are not equidistant
Vibrational levels in the model of anharmonic oscillator are equidistant
The model of anharmonic oscillator accounts interaction energy between vibrational and electronic motions.
Choose the right statement.
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The model of nonrigid rotator neglects the effect of centrifugal force
Rigid rotator has equidistant energy levels
Vibrating rotator model includes harmonic oscillator and rigid rotator
In the model of vibrating rotator.
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Each vibrational level has a rotational structure
Each rotational level has a vibrational structure
There is no rotational structure
In the model of vibrating rotator
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rotational constants do not depend on the vibrational state
rotational constants depend on the vibrational state
vibrational constants depend on rotational state
If in an atom s=1 and n=3, which orbital momentum number l and total angular momentum j are possible?
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l=3, j=4,3,2,1,0
l=2, j=3,2,1,0
l=0, j=0.5,0.5
If in a molecule Σ =1/2 and Λ =2, which Ω and J are possible?
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(Ω=2.5, J=1.5, 2.5, 3.5,…) & (Ω=1.5, J=2.5, 3.5,…)
(Ω=1.5, J=1.5, 2.5, 3.5,…) & (Ω=2.5, J=2.5, 3.5,…)
(Ω=1.5, J=2.5, 2.5, 3.5,…) & (Ω=2.5, J=3.5, 4.5,…)
If both electronic states are Σstates (Λ=0)
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There is no Q rotational branch
There is no P rotational branch
There is no R rotational branch
Choose the wrong statement:
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If B’ < B”, the band head in R branch, and the band is shaded to the red
If B’ > B”, the band head in P branch, and the band is shaded to the red
If B’ > B”, the band head in P branch, and the band is shaded to the blue
Magnetic moment of an atom has two largest components:
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Spin and rotational
Electron orbital motion and vibrational
Electron orbital motion and spin
Magnetic momentum of a molecule has contributions from:
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Electron spin and orbital momentum only
Electron spin and orbital momentum and rotation of nuclei
Electron spin and orbital momentum and rotation and total spin of nuclei
What is coupling of angular momenta?
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It is the interaction of their magnetic moments
Angular moment have the same projection
The spin magnetic moment equals to orbital magnetic moment.
Zeeman effect in a weak magnetic field implies that
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Spin is quantized separately from orbital momentum
Coupling between the spin and orbital momentum is stronger than the interaction with an external field
Magnetic momentum precesses faster around the magnetic field direction than about the total angular momentum.
PaschenBack effect implies that
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Coupling between the spin and orbital momentum is stronger than the interaction with an external field
Level splitting is linear as in the weak regime for all field strengths
Level splitting is like in the weak regime but every Zeemansublevel has a multiplet structure
Choose the correct statement:
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Q branch always weakens in a magnetic field
P and R branches can have opposite polarities
The smallest Zeeman effect is expected for molecular states with the greatest Ω numbers
Choose the wrong statement:
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Negative Lande factors are common for both atomic and molecular lines
Negative Lande factors are common for molecular lines
Negative Lande factors are rare in atomic transitions
FeH transitions are very sensitive to magnetic fields because
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this is a heavy molecule
because this molecule has many electrons and its electronic states are highly perturbed
because its strong transitions are observed in the infrared
PaschenBack effect leads to
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Stokes profile asymmetries and net polarization across line profiles
Strengthening of main branch and weakening of satellite and forbidden transitions
Rather symmetric Stokes profiles
Choose the correct statement:
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All metal hydride molecules show PaschenBack effect at a few (13)kG fields
Only CrH shows PaschenBack effect at a few (13)kG fields
Optical (0.31μm) bands of CN, CH, OH, MgH, CaH, and CrH show PaschenBack effect at a few (13)kG fields because they involve Σstates.
Choose the wrong statement:
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Scattering polarization depends on the scattering angle
Scattering polarization is determined by the projection of dipoles towards observer
Scattering polarization is parallel to the scattering plane
How is the scattering source function calculated?
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It is assumed equal to Planck function.
It is an integral of the Planck function over angles.
It is an integral of the intensity weighted by a phase function over angles.
The Hanle effect is
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Depolarization of scattering polarization
Modification of scattering polarization
Amplification of scattering polarization
Measuring entangled magnetic fields using molecular Hanle effect is advantageous because
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molecular lines provide zero magnetic field reference
molecular lines are much stronger than atomic lines
molecular lines are not sensitive to magnetic fields
In longitudinal magnetic field we observe onlyStokes VStokes I and VStokes V and Q
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Stokes V
Stokes I and V
Stokes V and Q
In transversal magnetic field we can observe
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All Stokes parameters
Stokes Q ans U only
Stokes I, Q and U
Smallscale magnetic fields on the Sun are well seen in molecular bands because
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molecular lines absorb light more efficiently
molecules are destroyed by hotter plasma within magnetic elements
molecules form more efficiently in magnetic environment
We can detect starspots better in molecular lines because
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Spots are cooler than the surrounding atmosphere
Molecules form more efficiently in magnetic regions
Atomic lines do not form in starspots
Molecular magnetic dichroism results in
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broad molecular bands on white dwarfs
mixing of all molecules in the atmosphere
broadband net polarization
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