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In the 1980's the process of high-order harmonic generation (HHG) was discovered. It was later shown that HHG produces attosecond pulse trains (APTs), with 1 as = 10^(-18) s, using a photoelectron interferometric technique called reconstruction of attosecond beating by interference of two-photon transitions (RABBIT). RABBIT uses a combination of an APT, which ionizes a gas, and an infrared (IR
