TITLE

Electronic angular momentum polarizations of photofragments: A case study of ICN photodissociation from a perpendicular transition

AUTHOR(S)
Kuo-mei Chen
PUB. DATE
June 2007
SOURCE
Journal of Chemical Physics;6/7/2007, Vol. 126 Issue 21, p214307
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A quantum treatment on ICN photodissociation from an initial perpendicular transition (Ω′=±1←Ω″=0) to the asymptote CN(|Σ+,J′M′N′12>)+I(2P3/2) is presented. Density matrices of both photofragments are derived and explicit expressions of the state multipoles in terms of the angular momentum coupling coefficients and the rotation-bending factors have been obtained. To perceive the physical origin of electronic angular momentum polarizations of the iodine photofragments, a correlation scheme which considers the magnetic dipolar and the electrostatic dipole-quadrupole interactions between I and CN cofragments is proposed. For ICN precursors in the vibrational ground state or in the equally populated l-type split levels, the alignment parameters of the iodine photofragments in the molecular frame can be calculated according to this long-range interaction model. For the perpendicular transition |1Π1>←|1Σ0+>, its alignment parameters of I(2P3/2) from the incoherent and coherent transitions to the |Ω′=1> and |Ω′=-1> components are ρ02(1Π1)=0.756 and ρ22(1Π1)=-0.656, respectively. For the perpendicular transition to |3Π1>, ρ02(3Π1)=-0.878 and ρ22(3Π1)=0.328 are from the incoherent transition, whereas ρ02(3Π1)=0.122 and ρ22(3Π1)=0.328 are from the coherent transition. To analyze the photoion images of iodine photofragments, angular distributions of I+ from the 2+1 resonance-enhanced multiphoton ionization detection scheme are derived.
ACCESSION #
25365784

 

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