Quenching of the 2pnd 1Po doubly excited states of helium by a dc electric field

Bučar, K.; Žitnik, M.; Mihelič, A.; Penent, F.; Lablanquie, P.; Palaudoux, J.; Andrić, L.; Braune, Markus; Püttner, R.

doi:10.1103/PhysRevA.90.013412

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Quenching of the 2pnd ¹P^o doubly excited states of helium by a dc electric field

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Braune, Markus
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Bučar, K., Žitnik, M., Mihelič, A., Penent, F., Lablanquie, P., Palaudoux, J., et al. (2014). Quenching of the 2pnd ¹P^o doubly excited states of helium by a dc electric field. Physical Review A, 90(1): 013412. doi:10.1103/PhysRevA.90.013412.

Cite as: https://hdl.handle.net/11858/00-001M-0000-001A-2BBE-E

Abstract

The fluorescence yield quenching of low-lying doubly excited 2pnd ¹P^o states is observed to depend strongly on a dc electric field strength and its orientation with respect to the polarization of the incoming photon beam. The reduction of the yield accompanied by the lifetime shortening is attributed to the Stark mixing with the neighboring 2sns ¹S^e states, which redirects the 2pnd ¹P^o decay to the prompt autoionization channel. For n≥4, the lifetimes decrease from several hundred picoseconds down to several tens of picoseconds when an electric field in the kV/cm range is applied parallel to the photon probe polarization. Practically no lifetime change is observed for polarization perpendicular to the electric field direction. The results of the complex-scaling calculations are in a good agreement with the experimental data.