Cold target recoil ion momentum spectrometer based on attosecond XUV-femtosecond IR pump-detection

Attosecond pulse laser has ultra-short time width and wide frequency spectrum, and has become an important tool for real-time detection and manipulation of ultrafast dynamic processes of electrons in atoms and molecules. The cold-target recoil-ion momentum imaging spectrometer (COLTRIMS) can record the three-dimensional momentum vectors of fragment ions and electrons, and can provide accurate kinetic data for the specific reaction channels by the fully differential coincidence measurement. We obtained attosecond pulses by high harmonic generation, and an AttoCOLTRIMS system was successfully constructed by combining an attosecond XUV pumping and a femtosecond IR probing pulses (or vice versa) with a cold-target recoil-ion momentum imaging spectrometer. We used the XUV pulses to ionize the noble gases, obtained the photoelectron angular distribution, and reconstructed the spectrum of high harmonics. The reliability and accuracy of this experimental apparatus was analyzed. (authors)