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Electronic Interactions > Roational Spectroscopy > Flashcards

Roational Spectroscopy Flashcards

1
Q

What is rotational spectroscopy

A

The study of how electromagnetic radiation interacts with a molecule to change its rotational energy

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2
Q

In what conditions can a molecule freely rotate

A

Gas

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3
Q

What is the moment of inertia

A

Resistance to rotation

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4
Q

What is the equation for moment of inertia

A

M1r1^2 +m2r2^2

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5
Q

What is rotational energy

A

Kinetic energy due to rotation

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6
Q

What is the equation for rotational energy

A

EN= 1/2I angular velocity ^2

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7
Q

How are the energy levels spaced

A

Closely

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8
Q

In what region are rotational transitions

A

Microwave

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9
Q

What is a rigid diatomic

A

A diatomic with fixed bond length

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10
Q

What is Ej = for rigid diatomic

A

BJ(J+1) where j =0,1,2,3…

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11
Q

What does J do

A

Quantise energy

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12
Q

What does B do

A

Links to specific molecule

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13
Q

What is the lowest energy level

A

0

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14
Q

What does it mean if energy is 0

A

No rotation occurring

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15
Q

What do the gaps do as energy levels increase

A

Increase in space

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16
Q

What is the equation for rotational constant B

A

= h/8pi^2Ic

17
Q

What is reduced mass

A

M1m2/m1+m2

18
Q

What is delta Ej equal to

A

2B(J+1)

19
Q

What is the gross selection rule?

A

Must have a change in dipole on rotation

20
Q

What is the specific selection rule

A

Delta j =+-1

21
Q

How many bands are shown in a spectrum

A

Many

22
Q

What determines strength of band

A

Population

23
Q

What is population proportional to

A

(2J + 1) e^(-Ej/KT)

24
Q

What effect does the molecule not being rigid have

A

It can stretch

25
Q

What equation takes into account non rigid

A

BJ(J+1) - DJ^2(J+1)^2

26
Q

What is D

A

Centrifugal distortion constant

27
Q

What are general rotational properties described by

A

3 moments of inertia about 3 perpendicular axis

28
Q

What is the application of rotational spectroscopy

A

Molecular structure And interstellar chemistry

Electronic Interactions (5 decks)

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