Ion imaging studies of ClONO2 photodissociation: Primary branching ratios and secondary dissociation

Kim, Hahkjoon; Greenwald, Erin E.; North, Simon W.

doi:10.1016/j.chemphys.2009.09.009

Cited by 2 publications

(2 citation statements)

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“…33 Speed distributions from ion-imaging experiments have also been modeled previously, for example, in North and coworkers' study of the photodissociation dynamics of ClONO 2 . 34 They used a Monte Carlo forward-convolution to fit their imaging data, allowing analysis of the secondary dissociation of the NO 3 fragment.…”

Section: Introductionmentioning

confidence: 99%

“…Strauss and Houston also provide a discussion of the difference between stepwise and asymmetric concerted dissociations using a maximum entropy approach . Speed distributions from ion-imaging experiments have also been modeled previously, for example, in North and co-workers’ study of the photodissociation dynamics of ClONO 2 . They used a Monte Carlo forward-convolution to fit their imaging data, allowing analysis of the secondary dissociation of the NO 3 fragment.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Theoretical Investigation of Triple Fragmentation in the Photodissociation Dynamics of H₂CO

et al. 2013

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The photodissociation dynamics of H2CO molecules at energies bracketing the triple fragmentation threshold were investigated using velocity map ion imaging of the H-atom fragments. An algorithm was developed to model the experimental results as a two-step process: initially barrierless C-H bond fission on the S0 potential energy surface to form H + HCO, followed by secondary fragmentation of those HCO radicals with sufficient internal energy to overcome the small exit channel barrier on the HCO surface to form H + CO. Our model treats the first step using phase space theory (PST) and the second using a combined PST-impulsive model, with a tunneling correction. Experimentally, triple fragmentation reaches 25% of the radical (H + HCO) channel photochemical yield at energies about 1500 cm(-1) above the barrier for breaking the second bond. In addition, the triplet (T1) channel appears to reduce in importance after the barrier on the T1 surface is exceeded, slowly decreasing to <10% of the total radical yield at higher energy. The double PST-impulsive model provides a good fit to the experimental H-atom speed and energy distributions for H2CO dissociation on S0 spanning >7000 cm(-1) of available energy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigation of Triple Fragmentation in the Photodissociation Dynamics of H₂CO

et al. 2013

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Photodissociation dynamics of Cl2O at 235nm using velocity map ion imaging

Kim¹,

North²

2011

Journal of Photochemistry and Photobiology A: Chemistry

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Ion imaging studies of ClONO2 photodissociation: Primary branching ratios and secondary dissociation

Cited by 2 publications

References 38 publications

Experimental and Theoretical Investigation of Triple Fragmentation in the Photodissociation Dynamics of H₂CO

Experimental and Theoretical Investigation of Triple Fragmentation in the Photodissociation Dynamics of H₂CO

Photodissociation dynamics of Cl2O at 235nm using velocity map ion imaging

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Ion imaging studies of ClONO2 photodissociation: Primary branching ratios and secondary dissociation

Cited by 2 publications

References 38 publications

Experimental and Theoretical Investigation of Triple Fragmentation in the Photodissociation Dynamics of H2CO

Experimental and Theoretical Investigation of Triple Fragmentation in the Photodissociation Dynamics of H2CO

Photodissociation dynamics of Cl2O at 235nm using velocity map ion imaging

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Product

Resources

About

Experimental and Theoretical Investigation of Triple Fragmentation in the Photodissociation Dynamics of H₂CO

Experimental and Theoretical Investigation of Triple Fragmentation in the Photodissociation Dynamics of H₂CO