Two-directional N2 desorption in thermal dissociation of N2O on Pd(1 1 0) at low temperatures

Angular distributions of desorbing N2 in thermal N2O decomposition on Rh(1 0 0)

“…In the lying form, both terminal atoms are bonded to neighboring top sites. (110) by DFT-GGA calculations [13,15]. Both forms were later confirmed on Pd(110) by scanning tunneling microscope and the near-edge X-ray absorption fine structure [16].…”

“…2(a)). In the analysis of the noisy AR signals, the average level was estimated by curve fitting, in which a Gaussian form was assumed [13]. The resultant angular distribution along the [001] direction is sensitive to the coverage (Fig.…”

Spatial distributions of desorbing products in steady-state NO and N2O reductions on Pd(110)

“…14 Later, we showed that this inclined N 2 desorption is well reproduced in N 2 O decomposition on Pd͑110͒, Rh͑110͒, and Ir͑110͒ as well as in steady-state NO + CO ͑or H 2 ͒ and N 2 O+CO ͑or H 2 ͒ reactions on Pd͑110͒. 13,[15][16][17][18][19][20][21][22] Thus, the intermediate N 2 O͑a͒ formed from the NO͑a͒ +N͑a͒ fast reaction [23][24][25] has been proposed to be oriented along the ͓001͔ direction before dissociation in the course of the catalyzed NO reduction. In the present work, AR-product desorption measurements have been successfully performed at different crystal azimuths for the steady-state NO ͑or N 2 O͒ + CO reaction and the resultant spatial distributions of all products have been constructed in a three-dimensional way.…”

“…124, 144711 ͑2006͒ transition or above it, the pattern was converted from a ͑1 ϫ 1͒ structure to ͑2 ϫ 3͒-O lattice. Both N 2 O and NO reductions are seriously retarded by adsorbed oxygen, 17,36 and thus the rate-limiting steps of the reactions are likely to proceed on clean parts free from oxygen.…”

“…Thus, the inclined N 2 emission in N 2 O decomposition on Pd͑110͒, Rh͑110͒, and Ir͑110͒ is the first example to show collimated fragment desorption in thermal decompositions on solid surfaces. [15][16][17][18] Its desorption dynamics will be informative regarding the energy partitioning in the dissociation event. The product N 2 effectively receives repulsive forces along the N 2 O molecular axis since recent density-functional theory ͑DFT͒ calculations with generalized gradient approximations 27,28 ͑GGA͒ and scanning tunneling microscope ͑STM͒ and near-edge x-ray-absorption fine structure ͑NEXAFS͒ work have confirmed the presence of ͓001͔-oriented N 2 O on Pd͑110͒.…”