Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 130, Issue 13, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3103486
Keywords
ab initio calculations; closed loop systems; isomerisation; molecule-photon collisions; optical control; optical pulse shaping; organic compounds; photochemistry; photodissociation; photoionisation; ultraviolet spectra
Funding
- National Science Foundation [0555214, 0449853]
- Department of Energy [DE-FG02-08ER15984, DE-PS02-08ER08-01]
- Direct For Mathematical & Physical Scien
- Division Of Physics [0555214] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0449853] Funding Source: National Science Foundation
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We demonstrate the use of shaped ultrafast laser pulses in the deep ultraviolet to control the ring opening isomerization of 1,3-cyclohexadiene to form 1,3,5-hexatriene. The experiments are performed with a gas phase sample and the isomerization yield is probed with dissociative ionization driven by a time-delayed, intense infrared laser pulse. Differences in the electronic structure of the ions for the two isomers, as shown by ab initio calculations, result in very different fragmentation products following strong-field ionization. We find that a shaped pulse yields a similar to 37% increase in the isomerization over an unshaped laser pulse.
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