Abstract
It is now well established that, under intense laser illumination, clusters undergo enhanced ionization compared to their isolated atomic and molecular counterparts being subjected to the same pulses. This leads to extremely high charge states and concomitant Coulomb explosion. Until now, the cluster size necessary for ionization enhancement has not been quantified. Here, we demonstrate that through the comparison of ion signal from small covalently bound silicon clusters exposed to low intensity laser pulses with semi-classical theory, their ionization potentials (IPs) can be determined. At moderate laser intensities the clusters are not only atomized, but all valence electrons are removed from the cluster, thereby producing up to Si 4+. The effective IPs for the production of the high charge states are shown to be ∼40% lower than the expected values for atomic silicon. Finally, the minimum cluster size responsible for the onset of the enhanced ionization is determined utilizing the magnitude of the kinetic energy released from the Coulomb explosion.
| Original language | English (US) |
|---|---|
| Article number | 055014 |
| Journal | New Journal of Physics |
| Volume | 14 |
| DOIs | |
| State | Published - May 1 2012 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Onset of Coulomb explosion in small silicon clusters exposed to strong-field laser pulses. / Sayres, Scott; Ross, M. W.; Castleman, A. W.
In: New Journal of Physics, Vol. 14, 055014, 01.05.2012.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Onset of Coulomb explosion in small silicon clusters exposed to strong-field laser pulses
AU - Sayres, Scott
AU - Ross, M. W.
AU - Castleman, A. W.
PY - 2012/5/1
Y1 - 2012/5/1
N2 - It is now well established that, under intense laser illumination, clusters undergo enhanced ionization compared to their isolated atomic and molecular counterparts being subjected to the same pulses. This leads to extremely high charge states and concomitant Coulomb explosion. Until now, the cluster size necessary for ionization enhancement has not been quantified. Here, we demonstrate that through the comparison of ion signal from small covalently bound silicon clusters exposed to low intensity laser pulses with semi-classical theory, their ionization potentials (IPs) can be determined. At moderate laser intensities the clusters are not only atomized, but all valence electrons are removed from the cluster, thereby producing up to Si 4+. The effective IPs for the production of the high charge states are shown to be ∼40% lower than the expected values for atomic silicon. Finally, the minimum cluster size responsible for the onset of the enhanced ionization is determined utilizing the magnitude of the kinetic energy released from the Coulomb explosion.
AB - It is now well established that, under intense laser illumination, clusters undergo enhanced ionization compared to their isolated atomic and molecular counterparts being subjected to the same pulses. This leads to extremely high charge states and concomitant Coulomb explosion. Until now, the cluster size necessary for ionization enhancement has not been quantified. Here, we demonstrate that through the comparison of ion signal from small covalently bound silicon clusters exposed to low intensity laser pulses with semi-classical theory, their ionization potentials (IPs) can be determined. At moderate laser intensities the clusters are not only atomized, but all valence electrons are removed from the cluster, thereby producing up to Si 4+. The effective IPs for the production of the high charge states are shown to be ∼40% lower than the expected values for atomic silicon. Finally, the minimum cluster size responsible for the onset of the enhanced ionization is determined utilizing the magnitude of the kinetic energy released from the Coulomb explosion.
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U2 - 10.1088/1367-2630/14/5/055014
DO - 10.1088/1367-2630/14/5/055014
M3 - Article
VL - 14
JO - New Journal of Physics
JF - New Journal of Physics
SN - 1367-2630
M1 - 055014
ER -