User talk:Sudip1993

Hello, this is my talk page. You can discuss anything (most preferably regarding physics, while complying with the | terms and conditions) here. If you have any specific questions related to any of the wiki-pages that I have edited, it will be better to ask them in their respective talk pages. I am going to work on Symmetry of diatomic molecules. There is no separate wikipedia page on it, so I am going to create one. My plan about the page is as following:


 * I will start with an introduction, I will give a brief overview of why we want to look into molecular symmetry (because it gives us insights about the properties such as structure and spectra without doing the actual rigorous calculation).
 * This will be followed by a section on how symmetry is related to group theory and the idea of point groups.
 * Then I will state and describe the 5 kinds of geometrical symmetries (symmetry axis, plane of symmetry, inversion center, rotation-reflection axis, identity) and the corresponding operations (I will also introduce Schoenflies notation).

Here, I would like to state the selection rules for the purely vibrational, purely rotational and vibration-rotation (or vibronic) transition for the two kinds of diatomic molecules. It will turn out that in order to show a purely vibrational spectrum, a diatomic molecule must have dipole moment that varies with distance. So, homonuclear molecules don't undergo electric dipole vibrational transitions; it shows, however, vibronic transition spectrum. A heteronuclear molecule shows both the spectra, although it needs to abide by the corresponding selection rules. It turns out that both the vibrational and rotational quantum numbers must change in the transition. So, the so called 'Q' (Δv=(+/-)1, ΔJ=0) branch of rotational spectra is forbidden.
 * Then I will enlist the different kinds of point groups associated with molecular symmetry. I specific, I will discuss in detail the most prominent symmetry groups in diatomic molecules, namely C∞v(linear) and D∞h(linear with inversion center). In case of a Homonuclear diatomic molecule, we see both the symmetries and in case of Heteronuclear diatomic molecule, we see only the former one.
 * Then I am planning to give a brief description of group representation and irreps (I am not sure about whether this will be relevant for my current reading or not, so there is a possibility that I will not include it).
 * Then I would like to include a section on how the symmetry and the corresponding commuting operators differ in diatomic molecules from the atomic case. Here, Hamiltonian does not commute with L2 and thus 'l' is no longer a good quantum number. The CSCO in this case is {H, Jz,Lz,S2,Sz,A, Π} (A inverts only one of the spatial co-ordinates).
 * Then I would like to discuss about the most general Hamiltonian of a diatomic molecule and Born-Oppenheimer approximation and the 'electronic ket' (or electronic wave function, or the word 'electronic term' used by Landau-Lifshitz).
 * Then I would like to probe into the role of symmetry in this electronic structure, and would introduce the molecular term symbol and discuss about Λ-doubling, gerade and ungerade states.
 * Now I would like to explore the observable consequence of symmetry in physical observations, i. e., the difference in spectral lines of homonuclear and heteronuclear molecules.


 * In the last section, I will discuss the intersection of potential curves for a diatomic molecules and the role of symmetry in it. Here, I would also like to discuss the von Neumann- Wigner non-crossing rule.

- This is my detailed plan till now. It can change depending on my further studies and discussions. --Sudip1993 (talk) 11:05, 9th October 2014 (UTC), 2014.

Welcome!
Welcome to Wikipedia, Sudip1993! Thank you for your contributions. I am VQuakr and I have been editing Wikipedia for some time, so if you have any questions feel free to leave me a message on my talk page. You can also check out Questions or type at the bottom of this page. Here are some pages that you might find helpful: Also, when you post on talk pages you should sign your name using four tildes ( ~ ); that will automatically produce your username and the date. I hope you enjoy editing here and being a Wikipedian! VQuakr (talk) 02:55, 15 October 2014 (UTC)
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Thank You!
Thank you,VQuakr, for your suggestions and the gift! It was sweet indeed! The links you sent were of immense help for me in getting started. I look forward to more suggestions and co-operations from you in future also. It is a privilege to meet you. :) --Sudip1993 (talk) 17:44, 15 October 2014 (UTC)

License tagging for File:Images elements.png
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Image
Thank you for pointing it out. There seemed to be an issue with the license, which was not included in the categories listed in the link given. So, I have deleted the respective image from the wikipedia page.--Sudip1993 (talk) 19:32, 26 October 2014 (UTC)

File source and copyright licensing problem with File:Co-ordinate system for a diatomic molecule.png
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Problems with upload of File:Two possible initial states of the system.png
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