A method for the determination of speed-dependent semi-classical vector correlations from sliced image anisotropies.
| Autor: | Grubb MP; Department of Chemistry, Texas A&M University, College Station, Texas 77842, USA., Warter ML, Freeman CD, West NA, Usakoski KM, Johnson KM, Bartz JA, North SW |
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| Jazyk: | angličtina |
| Zdroj: | The Journal of chemical physics [J Chem Phys] 2011 Sep 07; Vol. 135 (9), pp. 094201. |
| DOI: | 10.1063/1.3631343 |
| Abstrakt: | We present analytical expressions relating the bipolar moment β(Q)(K)(k(1)k(2)) parameters of Dixon to the measured anisotropy parameters of different pump/probe geometry sliced ion images. In the semi-classical limit, when there is no significant coherent contribution from multiple excited states to fragment angular momentum polarization, the anisotropy of the images alone is sufficient to extract the β(Q)(K)(k(1)k(2)) parameters with no need to reference relative image intensities. The analysis of sliced images is advantageous since the anisotropy can be directly obtained from the image at any radius without the need for 3D-deconvolution, which is not applicable for most pump/probe geometries. This method is therefore ideally suited for systems which result in a broad distribution of fragment velocities. The bipolar moment parameters are obtained for NO(2) dissociation at 355 nm using these equations, and are compared to the bipolar moment parameters obtained from a proven iterative fitting technique for crushed ion images. Additionally, the utility of these equations in extracting speed-dependent bipolar moments is demonstrated on the recently investigated NO(3) system. (© 2011 American Institute of Physics) |
| Databáze: | MEDLINE |
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