title: Molecular recollision interferometry in high harmonic generation.
abstract: We use extreme-ultraviolet interferometry to measure the phase of high-order harmonic generation from transiently aligned CO(2) molecules. We unambiguously observe a reversal in phase of the high-order harmonic emission for higher harmonic orders with a sufficient degree of alignment. This results from molecular-scale quantum interferences between the molecular electronic wave function and the recolliding electron as it recombines with the molecule, and is consistent with a two-center model. Furthermore, using the combined harmonic intensity and phase information, we extract accurate information on the dispersion relation of the returning electron wave packet as a function of harmonic order. This analysis shows evidence of the effect of the molecular potential on the recolliding electron wave.
authors: JILA and Department of Physics, University of Colorado and NIST, Boulder, Colorado 80309, USA. Xibin.Zhou@colorado.edu
authors: Xibin
authors: X
authors: Zhou
authors: Robynne
authors: R
authors: Lock
authors: Wen
authors: W
authors: Li
authors: Nick
authors: N
authors: Wagner
authors: Margaret M
authors: MM
authors: Murnane
authors: Henry C
authors: HC
authors: Kapteyn