期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 117, 期 34, 页码 8163-8174出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp402019s
关键词
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资金
- Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences
- United States Department of Energy [DE-AC04-94AL85000]
- Chemical, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy [DESC0002323]
- EPSRC [EP/C015975/1, EP/J017973/1]
- EPSRC [EP/J017973/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J017973/1, EP/C015975/1] Funding Source: researchfish
We report the direct angle-resolved measurement of collision-induced alignment of short-lived electronically excited molecules using crossed atomic and molecular beams. Utilizing velocity-mapped ion imaging, we measure the alignment of NO in its first electronically excited state (A(2)Sigma(+)) following single collisions with Ne atoms. We prepare A(2)Sigma(+) (nu = 0, N = 0, j = 0.5) and by comparing images obtained using orthogonal linear probe laser polarizations, we experimentally determine the degree of alignment induced by collisional rotational excitation for the final rotational states N' = 4, S, 7, and 9. The experimental results are compared to theoretical predictions using both a simple dassical hard-shell model and quantum scattering calculations on an ab initio potential energy surface (PES). The experimental results show overall trends in the scattering-angle dependent polarization sensitivity that are accounted for by the simple classical model, but structure in the scattering-angle dependence that is not. The quantum scattering calculations qualitatively reproduce this structure, and we demonstrate that the experimental measurements have the sensitivity to critique the best available potential surfaces. This sensitivity to the PES is in contrast to that predicted for ground-state NO(X) alignment.
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