IR-assisted ionization of helium by attosecond extreme ultraviolet radiation

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Author(s)
Ranitovic, P
Tong, XM
Gramkow, B
De, S
DePaola, B
Singh, KP
Cao, W
Magrakvelidze, M
Ray, D
Bocharova, I
Mashiko, H
Sandhu, A
Gagnon, E
Murnane, MM
Kapteyn, HC
Litvinyuk, I
Cocke, CL
Griffith University Author(s)
Year published
2010
Metadata
Show full item recordAbstract
Attosecond science has opened up the possibility of manipulating electrons on the ir fundamental timescales. Here, we use both theory and experi- ment to investigate ionization dynamics in helium on the attosecond timescale by simultaneously irradiating the atom with a soft x-ray attosecond pulse train (APT) and an ultrafast lase rpulse. Because the APT has resolution in both energy and time,we observe processes that could not be observed without resolu- tion in both domains simultaneously. We show that resonant absorption is impor- tant in the excitation of helium and that small changes in energies of harmonics ...
View more >Attosecond science has opened up the possibility of manipulating electrons on the ir fundamental timescales. Here, we use both theory and experi- ment to investigate ionization dynamics in helium on the attosecond timescale by simultaneously irradiating the atom with a soft x-ray attosecond pulse train (APT) and an ultrafast lase rpulse. Because the APT has resolution in both energy and time,we observe processes that could not be observed without resolu- tion in both domains simultaneously. We show that resonant absorption is impor- tant in the excitation of helium and that small changes in energies of harmonics that comprise the APT can result in large changes in the ionization process. With the help of theory, ionization pathways for the infrared-assisted excitation and ionization of helium by extreme ultraviolet (XUV) attosecond pulses have been identi?ed and simple model interpretations have been developed that should be of general applicability to more complex systems (Zewail A 2000 J. Phys. Chem. A 1045660-94).
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View more >Attosecond science has opened up the possibility of manipulating electrons on the ir fundamental timescales. Here, we use both theory and experi- ment to investigate ionization dynamics in helium on the attosecond timescale by simultaneously irradiating the atom with a soft x-ray attosecond pulse train (APT) and an ultrafast lase rpulse. Because the APT has resolution in both energy and time,we observe processes that could not be observed without resolu- tion in both domains simultaneously. We show that resonant absorption is impor- tant in the excitation of helium and that small changes in energies of harmonics that comprise the APT can result in large changes in the ionization process. With the help of theory, ionization pathways for the infrared-assisted excitation and ionization of helium by extreme ultraviolet (XUV) attosecond pulses have been identi?ed and simple model interpretations have been developed that should be of general applicability to more complex systems (Zewail A 2000 J. Phys. Chem. A 1045660-94).
View less >
Journal Title
New Journal of Physics
Volume
12
Copyright Statement
© 2010 Institute of Physics Publishing. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Subject
Atomic and Molecular Physics
Physical Sciences