rkb@po.CWRU.Edu (Robert K. Brunner) (04/07/91)
There has beene something bothering me about the EQ library card for some time. The problem occurs with the SIDENS utility function. The solid-state equations in the library use it extensively to calculate the intrinsic density of states for Si at a given temperature. The problem is that it does not give the same value as the textbook I am using for a class I am taking. For example, at 300K, the book says 1.45x10^10 cm^-3 but SIDENS gives 1.355x10^10. I realize that the function is not wrong; SIDENS is a very steep function of T, so T=300.8K gives 1.45x10^10 cm^-3, which is pretty close to 300K. The problem is that it doesn't give me the same numbers as the professor expects, making the EQ card equations useless. I have not found a way to override the SIDENS value. Unlike constants, you cannot override a rom function definition (or can you). Now that I think about it, I guess it wouldn't make too much difference to use T=300.8K whenever I want T=300K. It just bothers me. Robert