Most difficult part of the material
I dont really understand the Franck-Condon principle, especially the final paragraph in 12.7 about dissociating of molecules if the excited electronic state is not bound.
Most interesting part of the material
How the abundance of isotopes can be accounted for by the spectra of the vibrational states. THe spectrum for different isotopes will differ in the vibrational frequencies. What was more interesting was that we can see the relative abundance of each of the isotopes by looking at the intensities of the spectral lines.
Wednesday, October 10, 2007
Monday, October 8, 2007
Reading Assignment 17
Most interesting part of the material
That there will be more energy levels for molecules because of the extra degrees of freedom. I also found it interesting that these different states also emit different radiation corresponding to transitions between molecular and quantum states.
Most difficult part of the material
12.4 mainly how the orbital angular momentum is no longer conserved, though I do understand that a diatomic molecule will give rise to a force that is not centered.
That there will be more energy levels for molecules because of the extra degrees of freedom. I also found it interesting that these different states also emit different radiation corresponding to transitions between molecular and quantum states.
Most difficult part of the material
12.4 mainly how the orbital angular momentum is no longer conserved, though I do understand that a diatomic molecule will give rise to a force that is not centered.
Wednesday, October 3, 2007
Reading Assignment 16
Most difficult part of the material
12.3 on covalent bonds was hard to understand, especially when they start talking about antiparallel spins etc. ALso, how the Hartree theory relates to all, I'm not 100% sure.
Most interesting part of the material
It was interesting how we are now looking at the chemistry side of things, and how the physics we have been learning about applies to things like covalent and ionic bonds. I also understood the bits on indistinguishability in the H2 atom.
12.3 on covalent bonds was hard to understand, especially when they start talking about antiparallel spins etc. ALso, how the Hartree theory relates to all, I'm not 100% sure.
Most interesting part of the material
It was interesting how we are now looking at the chemistry side of things, and how the physics we have been learning about applies to things like covalent and ionic bonds. I also understood the bits on indistinguishability in the H2 atom.
Sunday, September 30, 2007
Reading Assignment 15
Most difficult part of the material
Trying to understand the spin orbital and momenta coupling - I still don't know what is meant by 'coupling' and this stopped me from understanding a fair amount of section 10.3.
Most interesting part of the material
How the different forces are more/less important at different radii of the atom. I thought it was interesting how this gave rise to the different optical excitation levels. I mostly understand how the shielding works but if this could be explained in more detail (just the basics) it would be great.
Trying to understand the spin orbital and momenta coupling - I still don't know what is meant by 'coupling' and this stopped me from understanding a fair amount of section 10.3.
Most interesting part of the material
How the different forces are more/less important at different radii of the atom. I thought it was interesting how this gave rise to the different optical excitation levels. I mostly understand how the shielding works but if this could be explained in more detail (just the basics) it would be great.
Tuesday, September 18, 2007
Reading Assignment 14
Most interesting part of the material
Finally less maths! I sort of understand the ground state energies, and how higher shells (in terms of quantum number) can have a lower energy. It is interesting how we can study some materials using the x-ray line spectra, and how we can observe the selection rules working. Can't wait to look at this!
Most difficult part of the material
I don't really understand teh Hartree theory, and how we can approximate the (Z-2) factor, if that is indeed what we are doing. It all seems a little inaccurate and im not sure about the reasoning behind it. I hope this is what we will focus on in the lecture.
Finally less maths! I sort of understand the ground state energies, and how higher shells (in terms of quantum number) can have a lower energy. It is interesting how we can study some materials using the x-ray line spectra, and how we can observe the selection rules working. Can't wait to look at this!
Most difficult part of the material
I don't really understand teh Hartree theory, and how we can approximate the (Z-2) factor, if that is indeed what we are doing. It all seems a little inaccurate and im not sure about the reasoning behind it. I hope this is what we will focus on in the lecture.
Wednesday, September 12, 2007
Reading Assignement 12
Most difficult part of the material
I don't understand why we ignore the Coulomb interaction, and why this would help us. Also, I found the exchange forces a little confusing along with antisymmetric eigenfuncitons. The singlet and triplet states are associated with the angular momentum, but im not sure how this ties in with our wavefunciton.
Most interesting part of the material
Even though i didn't completely understand it, the symmetries of the wavefunctions seem like they are pretty strange. To be honest it was hard to find much more interesting, since most of it was a little hard for me to comprehend.
I don't understand why we ignore the Coulomb interaction, and why this would help us. Also, I found the exchange forces a little confusing along with antisymmetric eigenfuncitons. The singlet and triplet states are associated with the angular momentum, but im not sure how this ties in with our wavefunciton.
Most interesting part of the material
Even though i didn't completely understand it, the symmetries of the wavefunctions seem like they are pretty strange. To be honest it was hard to find much more interesting, since most of it was a little hard for me to comprehend.
Monday, September 10, 2007
Reading Assignement 11
Most interesting part of the material
I put the most interesting bit first, since the most difficult part follows on from this.
The indistinguishability between the identical particles is always interesting, by using the uncertainty principle to see that it is impossible to identify the particles using quantum mechanics, but using classical they can easily be labelled.
Most difficult part of the material
The problem lies in writing the eigenfunctions such that they reflect the properties that multielectrons have. It appears that this is done using linear combinations of the eigenfunctions, and the maths looks very messy and difficult. If this could be simplified the understanding would be much easier.
I put the most interesting bit first, since the most difficult part follows on from this.
The indistinguishability between the identical particles is always interesting, by using the uncertainty principle to see that it is impossible to identify the particles using quantum mechanics, but using classical they can easily be labelled.
Most difficult part of the material
The problem lies in writing the eigenfunctions such that they reflect the properties that multielectrons have. It appears that this is done using linear combinations of the eigenfunctions, and the maths looks very messy and difficult. If this could be simplified the understanding would be much easier.
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