- #1
IHateMayonnaise
- 94
- 0
Howdy,
Just studying for a test, need to clear something up and I can't find it in any of my books.
My question is in regards to [itex]N[/itex], which to me seems like it is the same as [itex]<N>[/itex] also known as the thermal average occupancy. This quantity represents the thermal average number of the orbitals in the system while in thermal and diffusive contact with a reservoir. In such a domain, we want to use the grand partition function:
[tex]z=\sum_{ASN}e^{-\beta(N\mu-\varepsilon_s)}=\sum_{ASN}\lambda^Ne^{(-\beta\varepsilon_s)}[/tex]
where
[tex]\beta=\frac{1}{K_bT}[/tex], [tex]\lambda=e^{\beta\mu}[/tex]
And the following definitions for [itex]<N>[/itex]:
[tex]<N>=\frac{1}{z}\sum_{ASN}Ne^{-\beta(N\mu-\varepsilon_s)}[/tex]
and
[tex]<N>=\lambda\sum_{S}e^{-\beta\varepsilon_s}[/tex]
My question: What is the connection between the last two equations for [itex]<N>[/itex]? Thanks yall
IHateMayonnaise
Just studying for a test, need to clear something up and I can't find it in any of my books.
My question is in regards to [itex]N[/itex], which to me seems like it is the same as [itex]<N>[/itex] also known as the thermal average occupancy. This quantity represents the thermal average number of the orbitals in the system while in thermal and diffusive contact with a reservoir. In such a domain, we want to use the grand partition function:
[tex]z=\sum_{ASN}e^{-\beta(N\mu-\varepsilon_s)}=\sum_{ASN}\lambda^Ne^{(-\beta\varepsilon_s)}[/tex]
where
[tex]\beta=\frac{1}{K_bT}[/tex], [tex]\lambda=e^{\beta\mu}[/tex]
And the following definitions for [itex]<N>[/itex]:
[tex]<N>=\frac{1}{z}\sum_{ASN}Ne^{-\beta(N\mu-\varepsilon_s)}[/tex]
and
[tex]<N>=\lambda\sum_{S}e^{-\beta\varepsilon_s}[/tex]
My question: What is the connection between the last two equations for [itex]<N>[/itex]? Thanks yall
IHateMayonnaise