Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:

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Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor: Prof. Ian Williams

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 The Experiment…. QUB Ion Beam Apparatus

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 The Experiment…. QUB Ion Beam Apparatus

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 The Experiment…. QUB Ion Beam Apparatus B Ions Magnet Aperture

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 The Experiment…. QUB Ion Beam Apparatus

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 The Experiment…. QUB Ion Beam Apparatus

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 The Experiment…. UCL Neutral Target Apparatus Focussed Laser Beam

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 and scanning techniques…. z x y Intensity Scan focussed laser direction ion beam direction

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 and scanning techniques…. z x y Intensity Selective Scan focussed laser direction ion beam direction

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 and scanning techniques…. z x y Intensity Selective Scan focussed laser direction ion beam direction

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 and scanning techniques…. z x y Intensity Selective Scan focussed laser direction ion beam direction

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 and scanning techniques…. z x y Intensity Selective Scan focussed laser direction ion beam direction

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 and scanning techniques…. z x y Intensity Selective Scan focussed laser direction ion beam direction

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 …Sequential ionization Walker et al PRL, 73, 1227 (1994)

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 S …Sequential ionization Walker et al PRL, 73, 1227 (1994)

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 S NS …Nonsequential ionization Walker et al PRL, 73, 1227 (1994)

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 S NS …Nonsequential ionization Walker et al PRL, 73, 1227 (1994)

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Z Position (mm) Signal (arb.) Linear Circular …Xe results!! Xe → Xe +

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Z Position (mm) Signal (arb.) Linear Circular …Xe results!! Xe → Xe +

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Signal (arb.) Z Position (mm) Signal (arb.) Linear Circular …Xe results!! Xe → Xe 2+ Xe + from Xe

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Signal (arb.) Z Position (mm) Signal (arb.) Linear Circular …Xe results!! Xe → Xe 3+ Xe + from Xe Xe 2+ from Xe

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Signal (arb.) Z Position (mm) Signal (arb.) Linear Circular …Xe results!! Xe + → Xe 3+ Xe 2+ from Xe Xe 3+ from Xe Xe + from Xe

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Signal (arb.) Z Position (mm) Signal (arb.) Linear Circular …Xe results!! Xe 2+ → Xe 3+ Xe + from Xe Xe 2+ from Xe Xe 3+ from Xe Xe 3+ from Xe +

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Signal (arb.) Z Position (mm) Signal (arb.) Linear Circular …Xe results!! Xe + → Xe 2+ Xe + from Xe Xe 2+ from Xe Xe 3+ from Xe Xe 3+ from Xe + Xe 3+ from Xe 2+

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Vibrational Trapping in H 2 + ? 0  1  2  3  1s  g 2p  u Internuclear separation R (a.u.) Field-dressed potential energy (eV) v = 0 v = 9 v = 5 v = 4 v = 3 H neutrals from H 2 +

Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 …So what’s next?? Position Sensitive Detector resolve vibrational levels of H 2 + Cool vibrational levels of H 2 + electrostatic ion trap electric quadrupole Shorter pulses (~10 fs) hollow fibre (gas cell) freeze vibrational motion Frequency double laser (i.e. 800nm → 400nm) larger shift of photon dressed states of H 2 +

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