Phys. Rev. Lett. 94, 043001 (2005) [4 pages]

Production of Doubly Charged Helium Ions by Two-Photon Absorption of an Intense Sub-10-fs Soft X-Ray Pulse at 42 eV Photon Energy

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Yasuo Nabekawa ^*, Hirokazu Hasegawa, Eiji J. Takahashi ^†, and Katsumi Midorikawa
Midorikawa Laser Technology Laboratory, RIKEN, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan

Received 24 September 2004; published 31 January 2005

We report on the observation of doubly charged helium ions produced by a nonlinear interaction between a helium atom and photons with a photon energy of 42 eV which are generated with the 27th harmonic of a femtosecond pulse from a Ti:sapphire laser. The number of ions is proportional to the square of the intensity of the 27th harmonic pulse, and thus two-photon double ionization should be dominantly induced as compared with other nonlinear processes accompanying sequential ionization via a singly charged ion. This phenomenon is utilized to measure the pulse duration of the 27th harmonic pulse by using an autocorrelation technique, for the first time to our knowledge, and as a result a duration of 8 fs is found.

URL: http://link.aps.org/doi/10.1103/PhysRevLett.94.043001
DOI: 10.1103/PhysRevLett.94.043001
PACS: 32.80.Fb, 42.50.Hz, 42.65.Re

^* Electronic address: nabekawa@riken.jp
^† Present address: Department of Vacuum UV Photoscience, Institute of Molecular Science, Nishigonaka 38, Myodaiji, Okazaki 444-8585, Japan.

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Phys. Rev. Lett. 94, 043001 (2005) [4 pages]

Production of Doubly Charged Helium Ions by Two-Photon Absorption of an Intense Sub-10-fs Soft X-Ray Pulse at 42 eV Photon Energy

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