# $Cl^*(^2P_{1/2})$ production dynamics from chloroiodomethane $(CH_2ICl)$ in the ultraviolet

Senapati, Dulal and Das, Puspendu K (2004) $Cl^*(^2P_{1/2})$ production dynamics from chloroiodomethane $(CH_2ICl)$ in the ultraviolet. In: Chemical Physics Letters, 393 (4-6). pp. 535-538.

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## Abstract

Dynamics of $Cl^*(^2P_{1/2})$ production from chloroiodomethane dissociation has been investigated in the near ultraviolet $(222\leq\lambda_ex\leq304 nm)$. The quantum yield of $Cl^*(^2P_{1/2)}$ production, $\phi^*(Cl),$ has been measured by monitoring nascent $Cl(^2P_{3/2})$ and $Cl^*$ concentrations and compared with the quantum yield of $I^*(^2P_{1/2})$ production at the same excitation wavelengths. In the near ultraviolet where most of the transition strength is carried by the $\sigma^*(C–I)\leftarrown(I)$ transition, the measured $Cl^*$ quantum yield decreases as a function of increasing photolysis wavelength. An interchromophore energy transfer mechanism between the C–I and C–Cl chromophores has been proposed to rationalize $Cl^*$ production since the direct excitation of the $\sigma^*(C–Cl)\leftarrown(Cl)$ transition is less likely at wavelengths $\sim$100 nm away from the peak of the C–Cl absorption band.

Item Type: Journal Article The copyright belongs to Elsevier Division of Chemical Sciences > Inorganic & Physical Chemistry 25 Apr 2006 19 Sep 2010 04:25 http://eprints.iisc.ernet.in/id/eprint/6415