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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/36939
Record Status
Checked
Record Id
36939
Title
Atomic excitation during recollision-free ultrafast multi-electron tunnel ionization
Contributors
WA Bryan (STFC Rutherford Appleton Lab., and UCL)
,
SL Stebbings
,
J Mckenna
,
EML English
,
M Suresh
,
J Wood
,
B Srigengan
,
ICE Turcu (STFC Rutherford Appleton Lab.)
,
JM Smith (STFC Rutherford Appleton Lab.)
,
EJ Divall (STFC Rutherford Appleton Lab.)
,
CJ Hooker (STFC Rutherford Appleton Lab.)
,
AJ Langley (STFC Rutherford Appleton Lab.)
,
JL Collier (STFC Rutherford Appleton Lab.)
,
ID Williams
,
WR Newell
Abstract
Abstract: Modern intense ultrafast pulsed lasers generate an electric field of sufficient strength to permit tunnel ionization of the valence electrons in atoms(1). This process is usually treated as a rapid succession of isolated events, in which the states of the remaining electrons are neglected(2). Such electronic interactions are predicted to be weak, the exception being recollision excitation and ionization caused by linearly polarized radiation(3). In contrast, it has recently been suggested that intense field ionization may be accompanied by a two-stage 'shake-up' reaction(4). Here we report a unique combination of experimental techniques(5-8) that allows us to accurately measure the tunnel ionization probability for argon exposed to 50-fs laser pulses. Most significantly for the current study, this measurement is independent of the optical focal geometry(7,8), equivalent to a homogenous electric field. Furthermore, circularly polarized radiation negates recollision. The present measurements indicate that tunnel ionization results in simultaneous excitation of one or more remaining electrons through shake-up(9). From an atomic physics standpoint, it may be possible to induce ionization from specific states, and will influence the development of coherent attosecond extreme-ultraviolet-radiation sources(10). Such pulses have vital scientific and economic potential in areas such as high-resolution imaging of in vivo cells and nanoscale extreme-ultraviolet lithography
Organisation
CCLRC
,
CLF
,
CLF-ARTEMIS
Keywords
CLF 2006-2007
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Nat Phys
2, no. 6 (2006): 379-383.
doi:10.1038/nphys310
2006
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