“…Figures a and a show the N(1s) and C(1s) photoemission spectra of physisorbed DMAA [C 1 H 2 C 2 H−C 3 H 2 N(C 4,5 H 3 ) 2 ] on Si(111)-7×7, obtained upon exposing the Si sample to 15.0 L of DMAA at 110 K. The physisorbed molecules yield one N(1s) dominant peak centered at 400.1 eV, consistent with the data obtained for condensed N -containing compounds. ,,, In Figure a, two fitted C(1s) intensities are located at 285.3 and 286.5 eV, with an area ratio of ∼2:3. The peak at 285.3 eV is related to the sp 2 carbon atoms of C 1 H 2 C 2 H− ,,, and the other at 286.5 eV can be assigned to C 3 , C 4 , and C 5 , which are linked to the N atom directly.…”