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Time-resolved observation of interatomic Coulombic decay induced by two-photon double excitation of Ne₂

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arxiv 1902.09882 v1 pith:DBTXW35L submitted 2019-02-26 physics.atom-ph physics.atm-clusphysics.optics

Time-resolved observation of interatomic Coulombic decay induced by two-photon double excitation of Ne₂

classification physics.atom-ph physics.atm-clusphysics.optics
keywords statescoulombicdecaydoubly-excitedinteratomiclasertwo-photonagreement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The hitherto unexplored two-photon doubly-excited states [Ne$^{*}$($2p^{-1}3s$)]$_{2}$ were experimentally identified using the seeded, fully coherent, intense extreme ultraviolet free-electron laser FERMI. These states undergo ultrafast interatomic Coulombic decay (ICD) which predominantly produces singly-ionized dimers. In order to obtain the rate of ICD, the resulting yield of Ne$_{2}^{+}$ ions was recorded as a function of delay between the XUV pump and UV probe laser pulses. The extracted lifetimes of the long-lived doubly-excited states, 390 (-130 / +450} fs, and of the short-lived ones, less than 150~fs, are in good agreement with \emph{ab initio} quantum mechanical calculations.

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