TITLE

Control of photofragment angular distribution by laser phase variation

AUTHOR(S)
Hong Lae Kim; Bersohn, Richard
PUB. DATE
September 1997
SOURCE
Journal of Chemical Physics;9/22/1997, Vol. 107 Issue 12, p4546
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
When a molecule is dissociated through separate excitations by one or two polarized photons the fragment distribution is forward-backward symmetric with respect to the polarization axis. However, if the molecule is simultaneously excited by optical electric fields, E(ω) and E(2ω), the amplitude for excitation is a sum of an amplitude for absorbing one photon of frequency 2ω and an amplitude for absorbing two photons of frequency ω. When the sum is squared to obtain the fragment angular distribution, there is a cross product which depends on the phase difference ΔΦ=Φ2ω-2Φω. With suitable adjustment of the relative intensities at the two frequencies large unidirectionality can be obtained. The left-right anisotropy on the polarization axis depends on the symmetry of the transitions, real and virtual. In the most favorable case 97% of a particular fragment is ejected in one hemisphere and only 3% in the other. In a less favorable case 60% of the fragment is ejected in one hemisphere.
ACCESSION #
19375923

 

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