Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
18 Cards in this Set
- Front
- Back
|
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
|
