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          Institute: Fritz-Haber-Institut     Collection: Molecular Physics     Display Documents



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ID: 456331.0, Fritz-Haber-Institut / Molecular Physics
Intensity-resolved IR multiple photon ionization and fragmentation of C₆₀
Authors:Bakker, Joost; Lapoutre, Vivike J.F.; Redlich, Britta; Oomens, Jos; Sartakov, Boris G.; Fielicke, André; Helden, Gert von; Meijer, Gerard; Meer, Alexander F. G. van der
Language:English
Date of Publication (YYYY-MM-DD):2010-02-18
Title of Journal:The Journal of Chemical Physics
Journal Abbrev.:J. Chem. Phys.
Volume:132
Issue / Number:7
Start Page:074305-1
End Page:074305-9
Copyright:© 2010 American Institute of Physics
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The sequential absorption of multiple infrared (IR) photons by isolated gas-phase species can
lead to their dissociation and/or ionization. Using the newly constructed ”Free Electron Laser for
Intra-Cavity Experiments” (FELICE) beam line at the FELIX facility, neutral C₆₀ molecules have
been exposed to an extremely high number (≈1023) of photons/cm² for a total time duration of up
to 5 μs. At wavelengths around 20 μm, resonant with allowed IR transitions of C₆₀, ionization and
extensive fragmentation of the fullerenes is observed. The resulting photofragment distributions are
attributed to absorption in fragmentation products formed once C₆₀ is excited to internal energies
at which fragmentation or ionization takes place within the duration of the laser pulse. The
high IR intensities available combined with the large interaction volume permit spatially resolved
detection of the ions inside the laser beam, thereby disentangling the contributions from different
IR intensities. The use of spatial imaging reveals intensity dependent mass distributions that are
substantially narrower than what has been observed previously, indicating rather narrow energy
distributions. A simple rate-equation modeling of the excitation process supports the experimental
observations.
External Publication Status:published
Document Type:Article
Communicated by:Gerard Meijer
Affiliations:Fritz-Haber-Institut
External Affiliations:FOM Institute for Plasma Physics Rijnhuizen, Edisonbaan 14, NL-3439 MN Nieuwegein, The Netherlands;
A.M. Prokhorov General Physics Institute, RAS, Vavilov Street 38, 119991 Moscow, Russia
Identifiers:URL:http://jcp-beta.aip.org/jcpsa6/v132/i7/p074305_s1?... [only subscriber]
DOI:10.1063/1.3313926
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