General Flashcards
How do c v and wavelength relate
V = c / wavelength
E=
hv
What is wave particle duality
At atomic level matter can appear to be waves or particles depending on how they are observed
If a atom is described as having high frequency what is its wavenumber
High
If an atom is described as having a long wavelength what is it’s energy described as
Low
What is quantisation
A molecule can exist in only one of several energy levels
What types of energy can a molecule have
Electronic vibrational and rotational
To change energy level what amount of energy must an atom absorb or emit
The difference between the energy levels =hv
How does a schematic absorption spectrometer work
Radiation source provides many wave lengths a monochormeter selects one and is passed through the sample cell to the detector
How does a schematic emission spectrometer work
Excitation source passed through sample cell emitting several wavelengths which are selected my the monochrometer
What is a selection rule
States if a transition is allowed or disallowed
What controls band strength
Spacing in energy levels
Selection rules
Number of molecules
If energy levels are widely spaced what effect does this have on population
Significant in one state
How can band intensity be increased experimentally
Concentration and cell length
