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Nanoscale Physics Research Laboratory. School of Physics and Astronomy. The University of Birmingham. United Kingdom. Time of flight measurement of femtosecond ablation of graphite. Christophe Huchon. Attosecond meeting, 7 december 2005, Rutherford Appleton Laboratory.

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slide1

Nanoscale Physics Research Laboratory

School of Physics and Astronomy

The University of Birmingham

United Kingdom

Time of flight measurement of femtosecond ablation of graphite

Christophe Huchon

Attosecond meeting, 7 december 2005, Rutherford Appleton Laboratory

slide2

Motivation: mechanism(s) in femtosecond laser ablation ?

TOF

Products ONLY

from surface ?

TOF

Products from

surface + fragmentation ?

Thermal (equilibrium)

or/and

coulomb explosion (non equilibrium)?

slide3

LAYOUT PUMP-PROBE

Nd:YLF

1 kHz l = 527 nm

Up to 25 mJ

Ti:Sapphire,

82 MHz,

800 nm,

100 fs, 600 mW

Transfer arm

Regenerative

Amplifier

1 kHz

100 fs

Up to 2 mJ

STM

chamber

Time-of-flight

spectrometer

Ablation

chamber

Ar+ laser

All lines

6 W

PMT

Differential

pumping

chamber

HHG

chamber

Argon gas flow

slide4

Source/extraction

Drift region

Detector

E1 = V/s

E2 = 0

V

s

D

Principle of TOF spectrometer

 Ions desorbed from surface: if D >> s

slide6

pulse= 100 fs

Epulse= 200 J

Usample= 500 V

Ratio ≈ 11

slide7

pulse= 100 fs

Epulse= 10.5 J

Usample= 405 V

slide9

Summary

  • fragmentation process involved in the ablation of the graphite with femtosecond laser pulse.
  • need to find what is the rate thermal vaporization / Coulomb explosion  VUV probe
  • VUV, XUV will allow time-resolved photoelectron emission
slide10

Acknowlegdement

  • Andrey Kaplan
  • Miklos Lenner
  • Quanmin Guo
  • Richard Palmer
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