DISCUSSION 199 



luiuiiRscciuc has teased, one cm iicliai^c llic system, so to speak, In 

 illuiniiiaiing with visible liglit which causes a reappearance ol hmiinescence. 



Secoiuily. 1 would like to ask Dr. White to wliat he ascribes the Ijariuin 

 salts of |)ero\ide deri\ati\es which Drew isohited. Are they consistent with 

 any of the schemes you made? Would you also comment on the /;H depend- 

 ence of the fhiorescence and the Ihiorescence yields of the various phtiialiic 

 acid derivatives you believe mi,f>iu be the emitting molecule? 



Dr. Wiiiik: The salt that Drew isolated was just a bariimi saU of hnninol 

 in which the barium ion was solvated by hydrogen peroxide. I don't under- 

 stand your second cjuestion. Wiiich derivatives do you mean? 



Dr. Strkiuj-r: Vou mentioned tlie possibility of the phthallic acid deriva- 

 tive being the emitting molecules. Wiiat is its fluorescence yield at the pH 

 at which tlie reaction takes place? Is it as low as that of the hnninol itself? 

 Or is it cjuite a bit higher? 



Dr. Whitk: The fluorescence yield is about one-third that of luminol. 



Dr. Strkiilkr: And that yield is 0.2? 



Dr. Whitk: Yes, 0.2 is the maximum \alue. Ihis was measured at the pH 

 of maximum chemiluminescence. 



