VERY-LOW TEMPERATURE SURFACE-REACTION - N2O FORMATION FROM NO DIMERS AT 70 TO 90 K ON AG(111)
VERY-LOW TEMPERATURE SURFACE-REACTION - N2O FORMATION FROM NO DIMERS AT 70 TO 90 K ON AG(111)
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DOI：
10.1021/j100018a045
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发表时间：
1995-05-04
影响因子：
--
通讯作者：
KING, DA
中科院分区：
文献类型：
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作者：
BROWN, WA;GARDNER, P;KING, DA
当 Ag{111} 在 40 K 下暴露于 NO 时，单层吸附随后形成多层 (NO)(2)。加热至 60 K 会导致二聚体多层解吸，在表面留下单层。使用同位素，单层也被表征为二聚体，其 N-N 轴与表面共面。在 70 至 90 K 时，(NO)(2) 在 Ag{111} 表面上形成 N2O。进一步加热至 120 K 导致 N2O 解吸。因此，活性物质被证明是吸附的二聚体，其在暴露于NO时不能在较高温度下形成，因为表面覆盖率太低。因此，单体（吸附的 NO）被弱吸附，这与预期一致。
When Ag{111} is exposed to NO at 40 K, monolayer adsorption is followed by multilayer (NO)(2) formation. Heating to 60 K results in the desorption of the dimer multilayer, leaving a monolayer on the surface. Using isotopes, the monolayer has also been characterized as dimers, which have the N-N axis coplanar with the surface. At 70 to 90 K, N2O is formed from (NO)(2) on the Ag{111} surface. Further heating to 120 K results in the desorption of the N2O. The reactive species is thus shown to be the adsorbed dimer, which cannot be formed at higher temperatures on exposure to NO because the surface coverage is too low. The monomer, adsorbed NO, is thus weakly adsorbed, in agreement with expectation.