Title :
Nonsequential two-photon ionization of He by using intense high-order harmonics in the soft X-ray region
Author :
Hasegawa, Hirokazu ; Nabekawa, Yasuo ; Midorikawa, Katsumi
Author_Institution :
Laser Technol. Lab., Saitama, Japan
Abstract :
Multiphoton ionization processes in He using 41.8 eV soft X-ray photons are observed. Intense soft X-ray generated by phase-matched high-order harmonics enables the investigation of these nonlinear optical processes. The harmonics were introduced to a conventional time-of-flight (TOF) mass spectrometer to observe ion signals. The TOF spectra and photoelectron spectra of He are measured.
Keywords :
X-ray photoelectron spectra; helium; optical harmonic generation; optical phase matching; photoionisation; time of flight mass spectra; two-photon processes; 41.8 eV; He; high-order harmonics; multiphoton ionization processes; nonlinear optical processes; phase-matched high-order harmonics; photoelectron spectra; soft X-ray photons; time-of-flight mass spectrometer; two-photon ionization; Helium; Hydrogen; Ionization; Mirrors; Nonlinear optics; Optical harmonic generation; Optical pulse generation; Space vector pulse width modulation; Ultrafast optics; X-ray lasers;
Conference_Titel :
Lasers and Electro-Optics Society, 2004. LEOS 2004. The 17th Annual Meeting of the IEEE
Print_ISBN :
0-7803-8557-8
DOI :
10.1109/LEOS.2004.1363492
