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Electronic Interactions > Vibrational Soectroscopy > Flashcards

Vibrational Soectroscopy Flashcards

1
Q

How do atoms vibrate around equilibrium position

A

Like springs

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2
Q

What is Hookes law

A

F=-k (r-re)

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3
Q

What is potential energy

A

1/2k(r-re)

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4
Q

What is the force constant

A

Stiffness of spring/ strength of bond

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5
Q

What does potential energy mean

A

Energy due to position

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6
Q

What is total energy at turning points and equilibrium distance

A

PE and KE

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7
Q

If a bond is weak what is k (force constant)

A

Small

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8
Q

What is vvib

A

1/2pi roots/u

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9
Q

How are energy levels spaced

A

Moderately

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10
Q

What region is vibrational in

A

Infra red

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11
Q

What is a diatomic harmonic oscillator

A

A diatomic that obeys hookes law

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12
Q

What is Ev =

A

(V+0.5)vibrational wave number

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13
Q

What is V

A

Vibrational quantum number

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14
Q

What is vibrational wavenumber

A

Dependent on molecule

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15
Q

What is delta Ev

A

Vibrational wavenumber

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16
Q

Is v ever equal to zero

A

No, so molecule always have vibrational energy

17
Q

What is the gross selection rule

A

Must change dipole on vibration

18
Q

What is the specific selection rule

A

Change in v -+1

19
Q

How many band appear

A

1

20
Q

What is a diatomic vibrating rotor

A

Both rotating and vibrating

21
Q

What approximation is used to sum the energies of vibrating rotors

A

Born Oppenheimer

22
Q

What does the spectrum look like for a vibrating rotor

A

1 band for vibrating with fine structure for rotational

23
Q

What are the J branches

A

P q and R

24
Q

What can be observed in fine structure

A

Isotope peaks

25
Q

What constant is added to the energy equation for anharmomic oscillators

A

Anharmonicoty constant

26
Q

What changes in the energy potential diagram for an a harmonic oscillator

A

Energy gaps aren’t equal and not symmetrical

27
Q

What is different about a polyatomic from a diatomic in terms of modes of vibrations

A

Polyatomic has several modes, 3N degrees of freedom with 3’translational movements

28
Q

Equations for degrees of freedom liniar and non

A

Non - 3N-6

Lin - 3N-5

29
Q

What are the types of vibrations

A

Stretching and bending

30
Q

If a molecules is symmetric what are the vibrations

A

Coupled to give symmetric

31
Q

What is an asymmetric vibration

A

Out of phase

32
Q

What is a skeletal vibrations.

A

Several or all atoms

33
Q

What is a group vibration

A

Localised on anspesific bond or grou

Electronic Interactions (5 decks)

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