# Ket bra notation, and radial momentum

1. Jan 30, 2005

### Ed Quanta

I am told that <f|pr,g>=<prf|g> where pr is the operator for radial momentum and f and g are wavefunctions.

I know how to calculate <prf|g>, but I am not sure how to treat the comma in <f|pr,g>.

Anyone have an answer to this?

2. Jan 30, 2005

### pmb_phy

Who was it that told you that? I've never see a comma used like that. It has no meaning to me. A wave function is in a one-to-one correspondance with a bra or a ket so I don't see what two wave functions mean in there.

Pete

3. Jan 30, 2005

### Ed Quanta

Maybe it is a typo in the book but I am not sure. I have only
seen commas used in kets when distinguishing between m and l values for angular momentum of a particle.

4. Jan 30, 2005

### Newton

the letters inside a bra or ket denote the quantum numbers of that state with respect to some operator.
the notation pr,g must just refer to 2 different quantum numbers

5. Feb 1, 2005

### dextercioby

It's not possible...That "pr" is supposed to be $\hat{p}_{r}$ and not a quantum number.And besides,what quantum numbers are there for momentum??

Daniel.