Uss and Upp



 Dear Colleagues;
      Is anyone familiar with the abbreviations "Uss" and
 "Upp" as they might
 apply to physical or quantum chemistry?  They have units of eV, and may refer
 to something relating to spectroscopy, but as of this writing I haven't been
 able to find any useful definitions or descriptions of "Uss" and
 "Upp".
      Thanks in advance to all responders.
 Sincerely,
 (Dr.) S. Shapiro
 ZH, CH
 toukie &$at$& zui.unizh.ch