Tuning The Ultrafast Photodissociation Dynamics Of Ch3Br On Ultrathin Mgo Films By Reducing The Layer Thickness To The 2D Limit

Keywords

Femtosecond dynamics; Methyl bromide; MgO ultrathin films; Mo(1 0 0); Photodissociation; Pump-probe laser spectroscopy

Abstract

The femtosecond-laser induced photodissociation of CH3Br adsorbed at sub-monolayer coverage on a solid surface was investigated by time-resolved pump-probe mass spectrometry. To tune the interaction of the CH3Br molecules with the substrate, an Mo(1 0 0) surface was covered with ultrathin insulating MgO layers of variable thickness. By gradually decreasing the magnesia layer thickness to the 2D limit the photodissociation dynamics observed by detection of the methyl fragment indicates an energetic lowering of the relevant methyl bromide excited states due to the increasing spatial proximity of the metallic support. Potential orientational effects of the methyl bromide adsorption geometry are also considered.

Publication Date

11-16-2017

Publication Title

Chemical Physics Letters

Volume

688

Number of Pages

106-111

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.cplett.2017.09.019

Socpus ID

85029797018 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85029797018

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