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Multiple ionization of atom clusters by intense soft X-rays from a free-electron laser
H Wabnitz1, L Bittner, A R B de Castro
1Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22603 Hamburg, Germany.
Nature
|December 6, 2002
Summary
Intense soft X-ray free-electron laser radiation significantly enhances absorption in xenon clusters compared to individual atoms. This energy absorption leads to electron emission and complete cluster disintegration via Coulomb explosion.
Area of Science:
- Physics
- Chemistry
- Atomic and Molecular Physics
- Laser Physics
Background:
- Intense laser radiation drives nonlinear processes and optical technology advancements.
- Research has primarily focused on infrared, visible, and ultraviolet light.
- Recent progress in X-ray laser development offers new possibilities for studying matter structure.
Purpose of the Study:
- To investigate the interaction of soft X-ray radiation from a free-electron laser with xenon (Xe) atoms and clusters.
- To compare the absorption dynamics and ionization yields between individual Xe atoms and Xe clusters.
Main Methods:
- Utilizing a free-electron laser to generate intense soft X-ray radiation below 100 nm wavelength.
- Exposing xenon atoms and clusters to this radiation.
- Analyzing the resulting ionization and fragmentation patterns.
Main Results:
- Xenon atoms undergo single ionization upon absorbing single photons.
- Absorption is significantly enhanced in xenon clusters.
- Atoms within large clusters absorb an average of 400 eV (approximately 30 photons).
Conclusions:
- Soft X-ray laser irradiation heats xenon clusters, leading to electron emission.
- The enhanced absorption and energy deposition result in complete cluster disintegration through Coulomb explosion.
