21 February 2008 Multi-pathway I2 dissociation model for COIL
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Vibrationally excited iodine I2(X,v>20) is an important intermediate in the standard COIL dissociation model. This intermediate is populated by the I* + I2(X) reaction. In this model excitation probabilities for the v-th I2(X) vibrational level γ(v) are critical parameters. In the present study we examined excitation probabilities γ(v) based on the comparison of calculated populations of vibrational levels of iodine molecules with their experimental values. The total excitation probability for I2(X, v>25) was found to be γ(v>25)≈ 0.1. The standard dissociation model with γ(v>25) ≈0.1 cannot provide the observed dissociation rates. Moreover the number of O2(a) molecules consumed per dissociated I2 molecule would exceed 20 if the standard dissociation model is the predominant dissociation pathway, which is at variance with experiment. Barnault et al.3 found that the populations of I2(10≤v≤23) were much higher than ν≥30. Such high populations of I2(10≤v≤23) could be explained by means of direct excitation in the I* + I2(X) reaction. A satisfactory agreement between calculated I2(v) populations and the experimental data was achieved for the total excitation probability γ(v>25) =0.05-0.1 and for γ(15
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V. N. Azyazov, V. N. Azyazov, M. C. Heaven, M. C. Heaven, S. Yu. Pichugin, S. Yu. Pichugin, "Multi-pathway I2 dissociation model for COIL", Proc. SPIE 6874, High Energy/Average Power Lasers and Intense Beam Applications II, 687408 (21 February 2008); doi: 10.1117/12.770091; https://doi.org/10.1117/12.770091


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