Recent content by luke

  1. L

    3space graphs on Mathematica 8

    Well if you want to change the domain over which the plot is made, you just need to change the limits So this will show a cube that is 6x6x6 centered at (0,0,0) ContourPlot3D[f(x,y,z)==0,{x,-3,3},{y,-3,3},{z,-3,3}] This will show a larger region that is a 8x8x8 cube centered at...
  2. L

    How to show integral identity involving gaussian over x

    I solved it (after some friends pointed out some simple mistakes I was making). For the record, here is how I did it. I will use spherical coordinates with the z-axis aligned with \vec{y} \int d\vec{x} \frac{e^{-x^2}}{\left| \vec{x} - \vec{y}\right|} = \int_0^{2 \pi} d\theta...
  3. L

    3space graphs on Mathematica 8

    Let me know if you have trouble, but they worked for me. In general, I find Mathematica's greatest strength for a beginner is the documentation. The documentation is mostly just a bunch of examples. Check it out. I didn't know about ContourPlot3D until I checked the documentation. The way I...
  4. L

    Plasma & the elemental table

    So I believe that it will not be as simple as finding a table with elements and temperatures but it is possible that you could make sure a table with some assumptions. First off, do you know what a plasma is? In short a gas becomes a plasma when electron(s) are removed from the nucleus. The...
  5. L

    Boltzmann collision term

    If you are still interested in this problem maybe I could help. I have spent the last few weeks working with the boltzmann and fokker-planck collision operators. I take from your question that you are solving the collisional boltzmann equation and are having a hard time numerically solving the...
  6. L

    3space graphs on Mathematica 8

    That is a good question. I had never actually used to visualize 3D surfaces until now. Nice idea. Here are some example bits of script: ContourPlot3D[6 x + 2 y + 3 z == 6, {x, -3, 3}, {y, -3, 3}, {z, -3, 3}] ContourPlot3D[x^2 + y^2 + z^2 - 4==0 , {x, -3, 3}, {y, -3, 3}, {z, -3, 3}] I choose...
  7. L

    How to show integral identity involving gaussian over x

    So I have come across this integral identity in Krall's Principles of Plasma Physics (right after equ. 6.4.4 in the 1st edition) and I have not been able to show the identity is true. The reason that I would like to understand the integral is that I am trying to solve a similar problem to the...
  8. L

    Unknown Symbol in Molecular Term Symbols

    Thank you for your help. I found a reference that give essentially the same information but might be helpful to someone else who stumbles upon this. Molecular Spectra and Molecular Structure, Vol I by Herzberg. The appendix has a list of electronic structures and provides an explanation of...
  9. L

    Unknown Symbol in Molecular Term Symbols

    Thank you gabriels for the fast reply. I have a few follow up questions. If you could recommend a reference that uses this notation that might be easier then answering my questions. Either way is fine by me. From what I have read it makes sense that the X would denote the ground state but...
  10. L

    Unknown Symbol in Molecular Term Symbols

    Hello, I am interested in the electronic states of the N2 molecule. Now it is a homonuclear diatomic molecule and http://en.wikipedia.org/wiki/Molecular_term_symbol" [Broken]) but I do not understand what the Latin letters before the molecular term symbols mean. Here are some of the states...
  11. L

    Plasmon Physics

    Try "Surface plasmon subwavelength optics" WL Barnes, A Dereux, TW Ebbesen - Nature, 2003 http://www.me.berkeley.edu/~lwlin/me118/papers/paper11.pdf "Theory of Surface Plasmons and Surface-Plasmon Polaritons" Pitarke, Silkin, Chulkov, Echenique - Rep. Prog. Phys. 70 (2007) 1-87...
  12. L

    Physics of a Water Pendulum

    does this phenomenon occur no matter how much water you put in the water bottle? I feel like there but be a certain amount of water where this phenomenon would be more pronounced. I haven't thought about your problem long and I am not positive I understand exactly the phenomenon that is...
  13. L

    E-field from Time Varying B-field of Current Loop

    Ah ok good. That is what I had figured. I was later able to reason that my scalar field must be zero everywhere since it would correspond with charges. So it is good that you pointed it out because now I know I was thinking about it correctly. Thank you.
  14. L

    E-field from Time Varying B-field of Current Loop

    I believe what you are referring is the E-field in the loop. The E that is responsible for the current. But I am not interested in the inside of the current loop. Maybe I am misunderstanding what you are suggesting but I do not feel like it would produce the E-field in the regions about the...
  15. L

    Rocket equation

    I hope this isn't too off topic but i think you need [/tex] instead of [tex] at the end
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