Towards XUV pump-probe experiments in the femtosecond to sub-femtosecond regime: New measurement of the helium two-photon ionization cross-section
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
Non-linear photoionization of molecules in the 10–50 eV range is a prerequisite for pump-probe measurements with sub-femtosecond resolution, but hitherto has been limited to femtosecond resolution, low repetition rate and high photon flux laser systems. We demonstrate two-photon single ionization of helium atoms using 100 pJ, 1.34 fs pulses (main peak FWHM = 680 as) at 1 kHz repetition rate with a central photon energy of 19.6 eV. We obtained an exponent of 2:27 0:21 for the intensity dependence of the signal and a two-photon ionization cross-section of 5:0 0:5 x 10−50 cm4 s. Our work opens the possibility of attosecond pump-probe measurements of ultrafast molecular processes.
Date Issued
2017-09-01
Date Acceptance
2017-05-09
Citation
Chemical Physics Letters, 2017, 683, pp.38-42
ISSN
0009-2614
Publisher
Elsevier
Start Page
38
End Page
42
Journal / Book Title
Chemical Physics Letters
Volume
683
Copyright Statement
© 2017 Published by Elsevier B.V. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Commission of the European Communities
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000405802200007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
EP/I032517/1
290467
Subjects
Science & Technology
Physical Sciences
Chemistry, Physical
Physics, Atomic, Molecular & Chemical
Chemistry
Physics
ATTOSECOND PULSE-TRAIN
ELECTRON DYNAMICS
CHARGE MIGRATION
HE
PHOTOIONIZATION
ABSORPTION
PHOTOELECTRON
RESOLUTION
PHASE
SCALE
Publication Status
Published
Date Publish Online
2017-05-11