Submitted by Marites (Tess) Guinoo / University of St. Thomas on Mon, 12/07/2015 - 12:45
Forums

I noticed that different books have a different sign convention for LFSE.  The new editions of Miessler, Shriver and Housecroft uses the negative energy convention (- delta o + paring energy), while the older edition of Shriver and Huheey uses the positive energy convention (+ delta o - pairing energy).  

I'm curious, how do you teach LFSE? the negative or positive convention?

Which one is a better approach to the LFSE?  Do you know of a literature reference for this?

Tags
Anne Bentley / Lewis & Clark College

I teach that LFSE is a negative value with pairing energy as positive.  I used Shriver and Atkins one year, and I think they use the positive value for LFSE.  My students nearly revolted.  It was not pretty.  So I've never tried that again.  (Plus, the negative value for a stabilization energy makes more intuitive sense to me, as most stable states are lower in energy.)  

Mon, 12/07/2015 - 17:43 Permalink
Marites (Tess) Guinoo / University of St. Thomas

That makes sense.  I probably would just tell my students that some books have the positive convention, and some have the negative convention.  That way, they know about it.

Thank you.

Tue, 12/08/2015 - 14:59 Permalink