Atomic Cluster Heating

The nanoplasma model [15,30,31] provides an explanation for the much higher ion energies seen from large clusters compared to molecules and small clusters in terms of highly efficient collisional heating (inverse Bremsstrahlung) in the high density nanoplasma, as is seen in solid target laser plasmas. Above threshold ionization heating [38] is also included, but its contribution is small (<100 eV). The collisional heating of the cluster is calculated in the model as the heating of a uniform dielectric sphere in the time-varying electric field of the laser. Inside the dielectric sphere, the electric field is [39]

see formula (3) [TD69.pdf, page 313]

where E0 is the external field and the plasma dielectric constant is given by a Drude model

see formula (4) [TD69.pdf, page 313]

Here ne, ncrit are the electron and critical plasma densities, w is the laser frequency and v the electron–ion collision frequency that is calculated from the Silin formulae [40]. When ne = 3ncrit, |e + 2| goes through a minimum and the field inside the cluster is greater than the external field. At this resonance, the cluster heating rate is also increased, even though the electron–ion collision frequency is actually reduced. Another consequence of the geometry of the laser–cluster interaction is that there is no heat conduction possible to surrounding ‘‘cold’’ material, as is the case in a bulk plasma, suggesting that very high plasma temperatures may be attained in the nanoplasma. [TD69.pdf, page 313]

See Also

3.14 - Vortex Theory of Atomic Motions
13.04 - Atomic Subdivision
Atomic Cluster Ionization
Atomic Cluster X-Ray Emission
Atomic Clusters
Atomic Force
atomic mass
atomic number
atomic theory
atomic triplet
atomic weight
Clustered Water
Figure 13.06 - Atomic Subdivision
Formation of Atomic Clusters
Interaction of Intense Laser Pulses with Atomic Clusters - Measurements of Ion Emission Simulations and Applications TD69.pdf
Laser Cluster Interactions
Law of Atomic Dissociation
Law of Atomic Pitch
Law of Oscillating Atomic Substances
Law of Pitch of Atomic Oscillation
Law of Variation of Atomic Oscillation by Electricity
Law of Variation of Atomic Oscillation by Sono-thermism
Law of Variation of Atomic Oscillation by Temperature
Law of Variation of Atomic Pitch by Electricity and Magnetism
Law of Variation of Atomic Pitch by Rad-energy
Law of Variation of Atomic Pitch by Temperature
Law of Variation of Pitch of Atomic Oscillation by Pressure
Models of Laser Cluster Interactions

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