Electronic States Flashcards

1
Q

The interaction that mixes a ground state into a particular excited state must transform as the_______.

A

Direct product of the symmetry of the two states.

Γgs ⊗ Γex

(First step in determining if spin-orbit coupling mixes an excited state into an ground state.)

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2
Q

Relaxation of an excited state to a ground state that emits a photon without a change in spin multiplicity.

A

Fluorescence​​​

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3
Q

This process occurs when an excited molecule or atom relaxes to a lower energy state (possibly the ground state) through emission of a photon.

A

Luminescence ​​​

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4
Q

Relaxation of an excited state to a ground state that emits a photon with a change in spin multiplicity.​

A

Phosphorescence​

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5
Q

A process where there is a conversion between electronic states of different multiplicity.

A

Intersystem Crossing

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6
Q

In order that the spin-coupling operator mix a ground state into a particular excited state, what is required?

A
  • The energy difference between the two states must be small
  • The direct product of the two states must contain the irreducible representation of the spin-coupling operator.
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7
Q

A phenomenon that arises in paramagnetic systems with multiple unpaired electrons (i.e., S > 1/2) as a result of both spin–spin coupling (SSC) and spin–orbit coupling (SOC) interactions

A

Zero-field splitting

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8
Q

The spin-orbit coupling operator directly splits the degeneracy of a group state without resorting to a distortion.

A

In-state orbital angular momentum

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9
Q

When the spin-orbit coupling operator cannot split degeneracy of a state and requires coupling to a low lying excited state and a molecular distortion.

A

Out-of state orbital angular momentum

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10
Q

The interaction between electronic and nuclear vibrational motion that leads to d-d transition becoming more Laporte​ allowed

A

Vibronic Coupling

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11
Q

A type of electronic transition that involves a transition from metal dominated MOs in the ground state to ligand dominated MOs in the excited state.

A

Metal-Ligand Charge Transfer

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12
Q

A type of electronic transition between two metal sites differing only in oxidation state

A

Intervalence charge transfer

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13
Q

A type of electronic transition that involves a transition from ligand dominated MOs in the ground state to metal dominated MOs in the excited state

A

Ligand-Metal Charge Transfer

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14
Q

What non-radiative exchange mechanism is shown below?

A

Triplet-Triplet Dexter Energy Transfer

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15
Q

What non-radiative exchange mechanism is shown below?

A

Singlet-Singlet Dexter Energy Transfer

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16
Q

What non-radiative exchange mechanism is shown below?

A

Singlet-Singlet Foster Energy Transfer

17
Q

The characteristic of f-f transitions in Lanthanide:

A
  • Characteristic wavelengths
  • Narrow line widths
  • Millisecond lifetimes (Long lifetimes)
  • Laporte forbidden
18
Q

Which electronic transition will have the higher value of epsilon in the d2 metal complex?

4A2g —-> 2Eg

4A2g —-> 4T2g

A

4A2g —-> 4T2g

4A2g —-> 2Eg is spin forbidden

19
Q

Electronic transitions between states with different spin multiplicities.

A

Spin Forbidden

20
Q

How does the spin-orbit coupling operator transform in a particular point group?

A

Rx Ry Rz (infinitesimal rotations)

21
Q

How many microstate does the 3F term symbol contain?

A

21

—————————————————————–

F —> L=3 —> 2*(3)+1=7

7*3=21

22
Q

The degeneracy of the |Ms> sublevels of the ground state is lifted in the absent of a magnetic field.

A

Spin-Orbit Coupling

23
Q

Ground state will have the _____spin multiplicity.

A

Largest

If thesame spin multiplicity, then the GS will have the highest value of L.

24
Q

In Oh and D4h , all d orbitals are gerade and so too are the states arising from their d configurations. Thus, their electronic transitions between them are________.

A

Laporte Forbidden​

25
Q

If a system is centrosymmetric, electronic transitions between states with the same inversion symmetry (g –> g, u –> u) are forbidden, but transitions between states of different inversion symmetry

(g –> u, u –>g) are allowed.

A

Laporte’s Rule​

26
Q

Idenifty the gaseous ground state term symbol for a d2 metal ion.

A

<strong>3</strong>F

27
Q

Idenifty the strong field region of the

d5 Tanabe-Sugano Diagram.

A

Low Spin Configurations

28
Q

Idenifty the weak field region of the

d5 Tanabe-Sugano Diagram.

A

High Spin Configurations

29
Q

What is the symbol for the rhombic ZFS component​?

A

E parameter

30
Q

What is the symbol for the axial ZFS component​?

A

D parameter

31
Q

Idenifty the states that are involved in an avoided crossing

in the reaction coordinate below.

A

The a1 states

32
Q

Non-Crossing Rule

A

Two states of the same symmetry and spin multiplicity cannot cross. Instead, they will admix in order to cause an avoided crossing.​

33
Q

Determine ML and MS vaules of the free ions term below:

2D

A

D: L=2 ML={-2,-1,0,1,2}

2S+1=2 –> S=1/2 –> MS= {1/2,-1/2}

34
Q

BAc

A

A: Total orbital angular momentum (L)

B: Spin multiplicity (2S+1)

C: Total angular momentum (J)