Recent content by Log

I have been thinking about buying that book actually, it seems quite interesting. How much mathematics and QM is required to understand it? I have Ashcroft as well. There's a section on point groups and such but the notation is different, is this the same thing as high symmetry points? I didn't...

I know that a Brillioun Zone is a Wigner Seitz cell in k-space, but what are the symmetry points and lines? How are these used and what physical significance do they have? How are they chosen? I've read the first 6 chapters in Kittel. I don't think we're required to know this in the course...

Hi, I've seen pictures like this one: http://www.lcst-cn.org/Solid%20State%20Physics/Ch25.files/image002.gif Is there any good explanation somewhere on this subject? I'm using Kittel's book but there's nothing in there on this.

I was looking through some examples which applied the duality principle while studying for an up and coming exam when it hit me that the transform applied 4 times gives you back the same function. So is there some theory that uses this? perhaps some sort of operator? I thought it...

Hello! First let me introduce myself. I'm an engineering undergraduate in northern Europe. Ever since I started my engineering studies I've had an interest in Nanotechnology, which in my eyes is "the future" along with robotics, automation and more. I'm interested in theoretical mathematics...

Ahhh, you're right! I thought the comma was there to separate. Thanks!

I calculated the normal again and got it to be: n = (-(u + v), u - v, 2). This has a z-component > 0. Then I expressed A in terms of u and v: A = (uv, u2, v2). The dot product of A and n is: 4(2v2 + u3 - 2u2v - uv2) I can't see how the integral of this is going to be finite...

Homework Statement Given is the vector field, \overline{A} = (x2-y2, (x+y)2, (x-y)2). The surface: \overline{B} = (u+v, u-v, uv). The restrictions are the following: -1≤ u, v≤ 1, and the z-component of the normal has to be positive. Calculate I, I = ∫∫\overline{A}\cdot\overline{n}dS...

Thanks for the clarification. I didn't like the way they derived the equation in the book. Do you know of a good derivation online somewhere?

I could have called the standard enthalpy of vaporization Q if I wanted, what's important is that I defined it. Since it's the standard enthalpy of vaporization used in the equation above, how is it not a simple application of the formula? 1 atm is 760 Torr. Doing what you're saying will get...

Yes, it has the circle. It has subscript "vap" for vaporization as well. I checked the units for the gas constant, it's joules per kelvin per mole. The temperature units cancel, therefore the enthalpy change has to have units joules per moles for the units to cancel. Then we know that standard...

In my book, Chemical Principles by Atkins, H is in units joules per moles and has a small circle at the top right to indicate that it's for standard states of the substance. H, in the book, is called the standard enthalpy of vaporization and it is this same thing that is asked for in the...

Homework Statement Find the standard enthalpy of vaporization, standard entropy of vaporization and standard free energy of vaporization. Given are two pairs of temperature and vapor pressure for Arsine, AsH3. Vapor pressure is 35 Torr at -111.95C and 253 Torr at -83.6C. T [K] = T [C] +...

I see, thanks - for the answer to my other question as well! I'm guessing this is beyond undergraduate courses?

When we try to predict electronic configurations by the building up principle we add electrons to the d-orbitals before the p-orbitals for principal quantum numbers n ≥ 4. What I don't understand is why, according to my textbook, we're supposed to remove electrons from np-orbitals first, then...