[drewauerbach]

 I was hoping you could help me to answer a rather simple,
though quite bothersome, misunderstanding that I have about Maitland Jones'
presentation of the material in his text book, third edition.  I refer to page
28, chapter 1, where he describes the 1s orbitals of Hydrogen using greek
letter symbols.  I was hoping you could clarify the parameters of this
identification system.  Here is my misunderstanding, which I will present in
the form of a question:
     What is the difference between PSI(Ha) and PSI(Ha, 1s)?  My understanding
is that PSI(x) denotes the 1s orbital of x. If there is no difference, then why
be redundant?
     To those of you without immediate access to M. Jones, then I will try best to describe page 28. He talks about the 1s orbital in the hydrogen atom, and he introduced a way to write it on paper using symbols.  

[movies]

I only have the 2nd edition of that text, but it's probably the same.

Psi refers to the wavefunction for the entirety of an atom or molecule, right?  But that could encompass other orbitals too, such as p-orbitals and higher s-orbitals.  In the hydrogen molecule, the principle bonding orbitals are the 1s orbitals, but the others do contribute (albeit to a much smaller extent) in bonding.  So the diagram in the text is a simplified view of H₂, hence the label to note this approximation.

Psi is also sometimes used as a partial wavefunction, so referring to just one contributing part of the total wavefunction.

I hope this helps your understanding.

[drewauerbach]

Hey,
I appreciate your help, but I overlooked something on the figure to which the narrative text referred.  On the figure was the phrase, "PSI(Ha)=PSI(Ha, 1s)."  So it's just a convention where both forms mean the same thing.

[movies]

Okay, so you get it now, then?

[drewauerbach]

yup thanks a bunch