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25 Time Multiplexing

Publication: Time Multiplexing - A New Single Shot Femtosecond Pump-Probe Technique


Accession Number
    XB494-0002

Document Delivery
    The Genuine Article Number: XB494

Authors
    Weinkauf R., Lehr L., Georgiev D., Schlag EW .

Title
    TIME MULTIPLEXING - A NEW SINGLE SHOT FEMTOSECOND PUMP-PROBE 
    TECHNIQUE

Source
    Applied Physics B-Lasers & Optics. 64(5):515-519, 1997 May.

ISSN
    0721-7269

KeyWords Plus
    Mass-spectrometry. Laser-pulses. Spectroscopy. Molecules. Phase.
    Dissociation. Transition. Dynamics.

Abstract
   We propose a new multiplex and fast readout technique for gaining a
   complete femtosecond pump-probe spectrum in a  single shot which can be
   monitored on a conventional oscilloscope. The technique is based on
   counterpropagating fs  laser pulses in gaseous samples of low density and
   probe detection by ion or fragment ion formation. Along the laser interaction
   path, each site in the sample corresponds to a particular pump-probe delay:
   The complete molecular response is multiplexed to a one dimensional spatial
   map of ion density. We propose a time-of-flight mass spectrometer for the fast
   point-wise readout e.g. the demultiplexing of this ion map. By calculation and
   experiments we find that a linear demultiplexing is possible and that in a
   reflectron time-of-flight instrument a 100 fs pump-probe delay interval
   translates to an easily resolved time-of-flight spacing of 10 ns. The range of
   pump-probe delays that is estimated to be accommodated covers 100 fs up to
   10 ps. The technique is combined with mass selection providing mass
   resolution of 100. [References: 32]

Language
    English

Publication Type
    Article

CC Categories
    Applied physics/condensed matter/materials science.

Subset
    Current Contents/Physical, Chemical & Earth Sciences

Institution
    Reprint available from:
    Weinkauf R.
    HEINRICH-HEINE-UNIVERSITAET DUESSELDORF
    INST PHYSICAL CHEMISTRY & ELECTROCHEMISTRY I
    40204 DUESSELDORF
    GERMANY

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