Photolysis of adsorbed polyatomic molecules on dielectric surfaces: General mechanismsстатья
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Дата последнего поиска статьи во внешних источниках: 17 февраля 2021 г.
Аннотация:The photochemistry of adsorbed molecules critically differs from gaseous processes due to very fast vibrational
relaxation in adsorbates. The adlayer photolysis is only possible via repulsive states, but their number is limited
by avoided crossing. Pure repulsive interactions often occurred only at long bonds near dissociation limits. Such
regions cannot be populated by the absorption of molecules in the equilibrium ground state. A general way to
reach them consists of photoexcitation of a molecule to some high vibrational level, stretching the bond in the
course of its vibration, and transition via photon emission. The proposed mechanism was performed using a
single UV laser. Various bonds in numerous adsorbates were exclusively ruptured in this way. Our experimental
results for adsorbates were compared with published data on gaseous photolysis. This made it possible to
determine the differences between surface and gaseous photochemistry, as well as distinctive features of the
proposed mechanism.