Resolving Strong Field Dynamics in Cation States of CO_2 via Optimised Molecular Alignment
This thesis presents an experimental study of the ultrafast molecular dynamics of CO_2^+ that are induced by a strong, near-infrared, femtosecond laser pulse. In particular, typical strong field phenomena such as tunneling ionisation, nonsequential double ionisation and photo-induced dissociation are investigated and controlled by employing an experimental technique called impulsive molecular alignment. Here, a first laser pulse fixes the molecule in space, such that the molecular dynamics can be studied as a function of the molecular geometry with a second laser pulse. The experiments are placed within the context of the study and control of ultrafast molecular dynamics, where sub-femtosecond (10^-15 seconds) resolution in ever larger molecular systems represents the current frontier of research. The thesis presents the required background in strong field and molecular physics, femtosecond laser architecture and experimental techniques in a clear and accessible language that does not require any previous knowledge in these fields.
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Resolving Strong Field Dynamics in Cation States of CO_2 via Optimised ...
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alignment distribution alignment pulse amplification angle angular Ar++ atomic attosecond branching ratio channels circular polarisation CO+2 corresponding cos2 curves decreasing detector dissociation double ionisation driving laser effect electric field ellipticity curves ellipticity dependence employed excitation experimental experiments presented focussing fragmentation yield function impulsive alignment intensity dependence ion yield ionic ionisation rate ionization laser field laser induced laser polarisation laser pulse Lett linear linear probe measurements mechanism molecular alignment molecular axis molecular beam molecular dynamics molecular ensemble molecular frame molecular orbital molecules momentum nm probe nodal plane nonlinear optical NSDI obtained optical optimised P.B. Corkum parameters pathway peak intensity phase Phys polarisation dependence probe polarisation probe pulses pulse polarisation pump quarter-wave plate recollision recollision induced rotational temperature rotational wavepacket scan Sect setup spectral Springer Science+Business Media strong field regime thesis TOF axis TOF spectrometer TOF spectrum tunneling ionisation wave plate wavelength