On the difficulty of finding peer-reviewers

I have recently become an Associate Editor at PeerJ. I had several motivations for this:

• I strongly believe in their mission, and am very happy with my three publishing experiences with them.
• I mostly work alone and therefore my papers, in the long run, will not be a profitable for them. I felt that I should give them some extra support in exchange for their extremely low number-of-authors-based APC.
• As a mid-career researcher at a little-known teaching-based institution, I reasoned that this opportunity might increase my visibility and improve my CV.

I am enjoying my run as an editor. So far, I have shepherded seven papers through the publishing process: one of them was published a week ago, I rejected one "on arrival",  and five of them are undergoing review.  I target my peer-review invitations to people who have recently published work using the same methods, or studied the same question, both for the obvious expertise and hoping that they will find the paper interesting. Still, I was quite surprised with how hard it is to get people to accept reviewing papers: for two papers, I managed to get two reviewers with around 6-8 invitations, but my latest assignments required more than 15 invitations each!  I understand that everybody is busy researching, writing papers, applying for funding, etc., but I never thought that the acceptance rate for peer-review requests would be < 15%. I do not get many peer-review request myself, but I do believe I have an obligation of accepting as many requests as possible (and reviewing them promptly), and I thought this was the "common" mindset... Maybe the people I target for my invitations are simply too senior and are therefore swamped with review requests, but the emails of "non-senior" members of a Lab are too often hard to find, due to the common practice of including only the the lab leader "corresponding author".

Any thoughts/suggestions/gripes?

Gamess (US) frequently asked questions. Part 7: How to distinguish alpha from beta orbitals in the $VEC deck

Each line in a $VEC group contains the coefficients of five basis functions for a given orbital. These are formatted in a special way, with seven numbers in each line. These numbers are:

1st) the number of the orbital to which the coefficients belong (written with at most two characters, so that 1 means orbital 1, .. , 99 means orbital 99, 00 means orbital 100) . This number is repeated in the beginning of every line, until all coefficients for that orbital have been written

2nd) this number tells the program how to assign the coefficients to the basis functions. "1" means that the coefficients are for basis functions 1-5, "2" means that the coefficients are for basis functions 5-10, etc. In general , that number "n" directs the program to assign the five coefficients present in the line to basis functions 5*(n-1)+1 to 5*n.

3rd to 7th) coefficients of five basis functions

BETA orbitals are punched as a group immediately after all ALPHA orbitals.

This format entails that in molecules with more than 100 orbitals the $VEC group contains several blocks with the same 1st number. For example, in a molecule with 200 orbitals, alpha orbital 27 is described by the first block of lines beginning with "27", and alpha orbital 127 is described by the SECOND block of lines beginning with "27".

I usually find the beginning of the BETA orbitals by repeating a search for the string " 1 1" : if that string is preceded by a block beginning with "00 1", it usually refers to orbitals 101, or 201, etc. (the exception being those systems with exactly 100, 200, etc. orbitals). If string " 1 1" is NOT preceded by a block beginning with "00 1", you are sure to have found the beginnning of the BETA orbitals