CCL: the ionization potentials of p-(MeO, H, Cl, NO2)-phenyl-methyl-sulfane

 Sent to CCL by: "Yong  Wang" [anhui.wangyong/./]
 Dear CCLers,
 Recently, I research the mechanism of S-oxidation of a series of para-
 substituted sulfane derivatives: p-(MeO, H, Cl, NO2)-phenyl-S-methyl.
 I want know the experimental ionization potentials (IPs) of these compounds,
 Could anyone kindly tell me where I can find the IPs?
 Any responses will be greatly appreciated!
 Yong Wang
 Department of Organic Chemistry
 Hebrew University of Jerusalem
 The Hebrew University, Givat Ram Campus
 Jerusalem, 91904,Israel
 Email: wangy/./
     or anhui.wangyong/./