Hüter, O. and Temps, F. (2017) Note: Energy calibration of a femtosecond photoelectron imaging detector with correction for the ponderomotive shift of atomic ionization energies. Review of Scientific Instruments, 88 (4). 046101. DOI 10.1063/1.4979799.

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Abstract

Femtosecondphotoelectronimagingspectroscopyisapowerfultechniqueforfollowingstate-resolved molecular transformations in complex coupled potential energy landscapes. To avoid unwanted nonlinearside-effects,theemployedlaserpulseenergiesareusuallyreducedtominimalvalues.However, the energy calibration of the photoelectron imaging detector is ideally performed using multi-photon above-threshold ionization of suitable atomic species, for which rather high laser intensities are required. In this work, we show that the calibration spectra of xenon obtained with high laser pulse energies cannot be directly used for the evaluation of molecular photoelectron spectra recorded using low-energy laser pulses. The reason is the intensity-dependent AC Stark shift of the atomic ionization energies to larger values, which in turn leads to a corresponding decrease of the photoelectron kinetic energies. We present a simple procedure to quantify this so-called ponderomotive shift and calculate the theoretically expected un-shifted photoelectron energies.

Document Type:	Article
Research affiliation:	Kiel University Kiel University > Kiel Marine Science OceanRep > The Future Ocean - Cluster of Excellence
Refereed:	Yes
Open Access Journal?:	No
Publisher:	American Institute of Physics
Projects:	Future Ocean
Date Deposited:	21 Dec 2017 12:53
Last Modified:	24 Sep 2019 00:17
URI:	https://oceanrep.geomar.de/id/eprint/41101

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