How can two x-ray pulses affect elements within a material in different ways, so scientists can tune them to generate specific chemical reactions?

11 November 2014 0 4K Report

Two x-ray pulses can affect elements within a material in different ways, so scientists can tune them to generate specific chemical reactions. Researchers could even study different atoms within a molecule at slightly different times, providing a precise gauge of chemical and electronic changes within the molecule.

Can a person explain it to me how? I need some detailed information.

Thank you very very much . citation: https://www6.slac.stanford.edu/news/2013-03-26-two-color.aspx

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