Resolving Strong Field Dynamics in Cation States of CO_2 via Optimised Molecular Alignment

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Springer Science & Business Media, Apr 1, 2014 - Science - 205 pages
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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Contents

1 Introduction
1
2 Molecules in Strong Laser Fields
8
3 Lasers
51
4 Experimental Methods and Setup
75
5 Characterisation and Optimisation of Impulsive Molecular Alignment in Mixed Gas Samples
121
6 Multichannel Contributions in Nonsequential Double Ionisation of CO2
146
7 Strong Field Control of Dissociative Excitation in CO2+
175
8 Conclusion
201
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