Recent content by hymeme

ZapperZ, Thank you very much for the thoughtful reply. My question is not clear because I am not a physicist and not familiar with this area. This question occurred to me when we were synthesizing WO3 nanoparticles. At different temperature, the phase of the product is different. So I was...

thank you! From the paper, the value of the band gap various a lot for one specific phase. Does that mean such difference in structure is not the key factor which enfluences the energy much.(we synthesized WO3 experimentaly, but not familar with the theory. )

Dear all, I am recently dealing with crystals. There is one question which puzzles me a lot. How to calculate the energy of crystals? For example, tungsten oxide has severl polymorphs such as alpha, beta , and gamma. What is the energy difference among them. Hope you can help with this...

Thank jfizzix for the reply! It helped some. From some tables, we know that the rotational temperature of H2 is 88K. What does that imply? (Does it mean that to get the rotational bands, the temperature should be higher than 88K.) If H2 is at room temperature, or if it is at 1500K, will the...

I learned that Raman scattering can measure the vibrational / rotational temperature of certain species in a reacting flow. But couldn't figure out the physical meansing of these temperature. Why do we need such things? Can anyone help me? Thank you!

Thank you very much! I felt that it is kind strange that the properties of solid state are not included.

I am doing a simple thermodynamic analysis. Couldn't get thermodynamic values (such as internal energy, exergy, and so on) from common data base of CO2. I looked it up in REFPROP(By NIST) and EES. None of them have data below 212K. At one atmosphere CO2 sublime at about 195K. Could anyone...