Absolute calibration of 14N(D,α) and 14N(d,p) reactions for surface adsorption studies

The (d, α) and (d, p) reactions on 14N have been calibrated relative to the 16O(d, p1)17 O reaction at deuteron energies of 972 and 1200 keV, using high purity NO and N2O condensed on a thick Au or Pt substrate at 20 K. Six clearly resolvable nitrogen groups have been calibrated with an overall accuracy of +-3%. With the aid of two primary standards (Ta2O5 and Bi-implanted Si), all relative cross-sections have been converted into absolute values. Excellent agreement with earlier measurements of the 16O (d, p1) cross-section is obtained; the nitrogen groups, however, all exhibit markedly smaller cross-sections than previously reported. One very weak 14N group fell under the p1 peak of the 16O reaction; hence, the spectrum from frozen NH3 target was used to evaluate the necessary background correction to the observed 16O p1 yields. (orig.)