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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Electronic and Tunneling Predissociations in the 2p pi C-1 Pi(+/-)(u)(v=19) and 3p pi D-1 Pi(+/-)(u)(v=4, 5) States of D-2 Studied by a Combination of XUV Laser and Velocity Map Imaging
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Electronic and Tunneling Predissociations in the 2p pi C-1 Pi(+/-)(u)(v=19) and 3p pi D-1 Pi(+/-)(u)(v=4, 5) States of D-2 Studied by a Combination of XUV Laser and Velocity Map Imaging

机译：2P PI C-1 PI（+/-）（u）（v = 19）和3p pi d-1 pi（+/-）（u）（v = 4,5）态的电子和隧道预测 -2通过XUV激光和速度映射成像的组合研究

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摘要

The predissociation mechanism of D-2 near the threshold for the production of the D(2s, 2p) fragments has been studied by measuring the fragment yield spectra, fragment velocity map images, and fragment branching ratios D(2s)/(D(2s) + D(2p)) using a combination of XUV laser and velocity map imaging. The predissociation dynamics of the 2p pi C-1 Pi(+/-)(u)(v = 19) and 3p pi D-1 Pi(+/-)(u)(v = 4,5) states were studied. The 2p pi C-1 Pi(+/-)(u)(v = 19) state is a bound state due to a shallow barrier. For the R(0) transition to the 2p pi C-1 Pi(+)(u)(v = 19) state, the experimental results suggest that the predissociation occurs via three channels with decreasing importance: l-uncoupling with the 2p sigma B-1 Sigma(+)(u) state, tunneling, and l-uncoupling with the 3p sigma B-'1 Sigma(+)(u) state. For the R(1) transition to the 2p pi C-1 Pi(+)(u)(v = 19) state, the first channel plays the dominant role. For the Q(1) transition to the 2p pi C-1 Pi(-)(u)(v = 19) state, the predissociation occurs via tunneling as required by symmetry. For the predissociation of the 3p pi D-1 Pi(+)(u)(v = 4,5) states, the experimental data confirm the earlier results indicating that the main perturbing state is 3p sigma B-'1 Sigma(+)(u). The Beutler-Fano profiles and the associated spectroscopic parameters for the various predissociations have also been obtained. The measured Fano-parameters q for the P- and R-branches of the 3p pi D-1 Pi(+)(u) state are found to have opposite signs, and their relationships are in agreement with a formula derived from the Fano equation. Rotationally resolved Beutler-Fano profiles were measured for the P(2) and P(3) lines.
机译：通过测量片段屈服光谱，片段速度图图像和片段分支比D（2s）/（d（2s）来研究D-2阈值的D-2附近的预处理机制已经研究了D（2S，2P）片段的阈值。 ）+ D（2P））使用XUV激光和速度映射成像的组合。研究了2P PI C-1 PI（+/-）（u）（v = 19）和3p pi d-1 pi（+/-）（u）（v = 4,5）状态的预选动态。由于浅水屏障，2P PI C-1 PI（+/-）（u）（v = 19）状态是界定状态。对于R（0）转换到2P PI C-1 PI（+）（u）（v = 19）状态，实验结果表明，通过三个通道发生预处理，其重要性降低：L-与2p sigma的解耦B-1 sigma（+）（u）状态，隧道和L-与3p sigma b-'1 sigma（+）（u）状态的脱位。对于r（1）转换到2p pi c-1 pi（+）（u）（v = 19）状态，第一频道起到主导作用。对于Q（1）转换到2P PI C-1 PI（ - ）（U）（v = 19）状态，预测通过对称性的要求通过隧道进行。对于3P PI D-1 PI（+）（u）（v = 4,5）状态的预定，实验数据确认前面的结果表明主扰动状态是3p sigma b-'1 sigma（+） （U）。还获得了Beutler-Fano的配置文件和各种预测的相关光谱参数。发现3P PI D-1 PI（+）（+）（u）状态的P-和R分支的测量的FANO参数Q具有相反的迹象，并且它们的关系与来自FANO方程导出的公式一致。测量P（2）和P（3）线测量旋转分辨的贝特勒 - 扇形型材。

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