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Photon Science Seminar: Transient dipole-interactions on sub-cycle timescales

Date and Time: 
August 30, 2019 - 3:00pm
Location: 
SLAC, 901-108 A&B Redtail Hawk Conference Rooms

Transient dipole-interactions on sub-cycle timescales

Lorenz Drescher

Max Born Institute (Berlin)

 

The interactions of attosecond XUV pulses with matter offer intriguing
opportunities to study electron dynamics driven by IR fields on a
sub-cycle timescales. Attosecond transient absorption spectroscopy
(ATAS) is a quickly emerging method to characterize these light-induced
effects. We will present a recent study of ATAS on CH3I molecules, that
shows the state-resolved polarizability of core-excited states. We will
discuss an analysis method to extract the polarizability and temporal
behavior from ATAS and discuss the effects of molecular symmetry on the
ATAS signal.

Besides absorption, the interaction of the induced dipole with the XUV
field can lead to refraction. We will present a method to measure
refraction in the XUV spectral region using dense inhomogeneous
gas-jets. The control over refraction in the XUV region allows to
develop XUV refractive optics as is demonstrated in an XUV gas lens.