Examination of Wavelength Dependent Vector Correlation of the NO Photofragment from the 223 nm. Photodissociation of Methyl Nitrite Using Linearly and Circularly Polarized Light
Lantis, Jeremy David
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Methyl nitrite has been researched extensively, but very little work has been done to study the S0->S2 excitation and dissociation. The purpose of this project was to study the chemical dynamics of this dissociation and determine if there is wavelength dependent vector correlation. Three lasers were used in a 1+1’ REMPI scheme to photodissociate methyl nitrite and then ionize the NO photofragment. A 225 nm beam was used for the dissociation of the molecule, a tunable 223-226 nm polarized probe beam was used to excite the NO+ photofragment, and a 320 nm beam was used to ionize the NO photofragment. Experiments were performed using linearly and circularly polarized light. The NO+ ions that resulted were detected using velocity-mapped ion imaging. The ion images were analyzed to determine the chemical dynamics of the molecule as it dissociated. The ion images showed that for linearly polarized light, the μ-v and v-j demonstrated wavelength dependence while μ-v correlation did not. For circularly polarized light, μ-v and (v x μ) · j correlations showed wavelength dependence. These results indicate that as higher J transitional states are probed, the angle between μ, v, and j change.