Applied Physics Letters · 2003 · 94 citations · 12 references
Natural SciencesMaterials SciencePhysicsMolecular PhysicsPlasma PhysicsSpectroscopyLaser OpticsLaser PhysicsLaser SpectroscopyLaser-plasma InteractionsSilicon MaterialsUltrafast OpticsCoulomb ExcitationCoulomb ExplosionFemtosecond Laser PulsesLaser AblationSiliconTime Of FlightUltrafast Laser ExcitationVelocity
The ablation of ionized silicon is studied using near-infrared femtosecond laser pulses in the fluence regime from 1 to 9 J/cm2. Two major peaks are observed in the mass spectrum corresponding to Si+ and Si2+. In the time-of-flight transients of Si+, a bimodal structure is observed. The fast Si+ peak corresponds to a velocity half of that observed for Si2+. This momentum scaling is clearly indicative of a Coulomb explosion.
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