Femtosecond versus nanosecond surface photochemistry: O2+CO on Pt(111) at 80 K

F. J. Kao*, D. G. Busch, D. Gomes Da Costa, W. Ho

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

104 Scopus citations

Abstract

Desorption of O2 and production of CO2 from O2 coadsorbed with CO on Pt(111) at 80 K were induced by laser pulses of femtosecond and nanosecond durations. The photoyields with femtosecond pulses show highly nonlinear dependence on fluence, large enhancement of cross section, and increase of the O2 desorption to CO2 production branching ratio, when compared with desorption and reaction induced by nanosecond pulses. These differences are attributed to multiple excitations occuring within the time scale of relaxation of the excited adsorbate-surface comples, which are possible with high intensity femtosecond pulse laser irradiation.

Original languageEnglish
Pages (from-to)4098-4101
Number of pages4
JournalPhysical Review Letters
Volume70
Issue number26
DOIs
StatePublished - 1993

Fingerprint

Dive into the research topics of 'Femtosecond versus nanosecond surface photochemistry: O2+CO on Pt(111) at 80 K'. Together they form a unique fingerprint.

Cite this