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18 Cards in this Set

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Complete the equation.

Ephoton =

(Hint: energy levels)
Ephoton = E2 - E1 = hv

Ephoton is the energy emitted by a photon in a transition between two energy levels labelled 1 and 2. h is planks constant.
Complete the equation.

C =

(Hint: wave equation)
C = vλ

C is the speed of light and v is the frequency of a light photon. λ is the wavelength of the light.
A fact vital to spectroscopy is Q........, what does this word mean?
Quantisation means that only certain discrete energy levels can exist and a molecule must be in one of these levels.
In spectroscopy T......... between these levels is induced by A....... or E........
Transition
Absorption
Emission
Only wavelengths which satisfy the R.......... C.......... can be A.......... or E...........
Resonance Condition
Absorbed
Emitted
Molecules have the following energy levels.
T..........
R..........
V..........
E.........
Translational
Rotational
Vibrational
Electronic
Put the following in order of size:
Rotational
Electronic
Vibrational
Rotational << Vibrational << Electronic.
Rotational transitions are measured using ....
Microwaves.
Vibrational transitions are measured using ....
Infrared and Raman.
Electronic transitions are measured using ....
Ultraviolet and Visible.
What does the Born - Oppenheimer approximation regard?

(Hint: Separation)
The Born - Oppenheimer approximation states that it is possible to separate the energy of a molecule into electronic, vibrational and rotational.
The equation relating to diatomic molecules and the number of allowed rotational energies is...
Ej = BJ (J + 1)

J = rotational quantum number
B = rotational constant
The equation to determine the constant B is...
B= h^2/(〖8π〗^2 I)
If I is the moment of inertia of a molecule then how do you determine this number?
I = μr^2

r is the bond length
μ is the symbol for reduced mass...how do you determine μ?
μ = (Ma x Mb)/(Ma + Mb)
If atoms A and B are heavier, does μ increase or decrease?
Increases
If atoms A and B are heavier, does the rotational constant increase or decrease?
Decreases
If the bond length is smaller then is the rotational constant larger or smaller?
Larger