TY - JOUR
T1 - Femtosecond versus nanosecond surface photochemistry
T2 - O2+CO on Pt(111) at 80 K
AU - Kao, F. J.
AU - Busch, D. G.
AU - Gomes Da Costa, D.
AU - Ho, W.
PY - 1993
Y1 - 1993
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=5244382699&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.70.4098
DO - 10.1103/PhysRevLett.70.4098
M3 - Article
AN - SCOPUS:5244382699
SN - 0031-9007
VL - 70
SP - 4098
EP - 4101
JO - Physical Review Letters
JF - Physical Review Letters
IS - 26
ER -