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Issue 38, 2014
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The effect of pump-2 laser on Autler–Townes splitting in photoelectron spectra of K2 molecule

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Abstract

We theoretically investigated Autler–Townes (AT) splitting in the photoelectron spectra of a four-level ladder K2 molecule driven by pump1–pump2–probe pulses by employing the time-dependent wave packet approach. The effect of pump-2 laser intensity and wavelength on AT splitting was studied for the first time. Triple splitting with asymmetric profiles arises because of the non-resonant excitation. The triple splitting transforms to double splitting when pump-2 detuning approaches ±1/2 times of pump-1 Rabi frequency. The splitting between two side band peaks in the triplet or doublet does not change with the pump-2 laser wavelength. The three peaks shift to a lower energy with a different shift as pump-2 wavelength increases. The magnitude of AT splitting increases with increasing pump-2 laser intensity. The asymptotic behavior of AT splitting with the pump-2 laser intensity are interesting at the threshold point of the near resonant region and far-off resonant region.

Graphical abstract: The effect of pump-2 laser on Autler–Townes splitting in photoelectron spectra of K2 molecule

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Article information


Submitted
23 May 2014
Accepted
14 Jul 2014
First published
16 Jul 2014

Phys. Chem. Chem. Phys., 2014,16, 20755-20762
Article type
Paper
Author version available

The effect of pump-2 laser on Autler–Townes splitting in photoelectron spectra of K2 molecule

W. Guo, X. Lu, X. Wang and H. Yao, Phys. Chem. Chem. Phys., 2014, 16, 20755
DOI: 10.1039/C4CP02258K

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