Attosecond nonlinear Fourier transformation spectroscopy of CO2 in extreme ultraviolet wavelength region

The interferometric autocorrelation functions of attosecond pulse trains in the time domain were measured by detecting CO22+ as well as the atomic and molecular fragment ions generated via two-photon absorption of intense vacuum ultraviolet-extreme ultraviolet light by CO2. It was demonstrated that the Fourier transformation of the interferometric autocorrelation functions of the respective fragment ions appearing in a time-of-flight mass spectrum exhibit spectroscopic information in the frequency domain corresponding to the two-photon photofragment excitation spectra of CO2 and the double ionization excitation spectrum to form CO22+. c 2008 American Institute of Physics. [DOI: 10.1063/1.3006026]