Observation of large populations in excited states after short-pulse multiphoton ionization

1992 ◽  
Vol 68 (18) ◽  
pp. 2747-2750 ◽  
Author(s):  
M. P. de Boer ◽  
H. G. Muller
Keyword(s):  
Excited States ◽  
Short Pulse ◽  
Multiphoton Ionization ◽  
Large Populations

Multiphoton ionization by a very short pulse

2017 ◽  
Vol 187 (11) ◽  
pp. 1280-1287 ◽  
Author(s):  
Leonid V. Keldysh
Keyword(s):  
Short Pulse ◽  
Multiphoton Ionization

Multiphoton ionization front excited states

1977 ◽  
Vol 13 (9) ◽  
pp. 737-739 ◽  
Author(s):  
A. Kushelevsky ◽  
N. Kopeika
Keyword(s):  
Excited States ◽  
Multiphoton Ionization ◽  
Ionization Front

Investigation of the State of Local Thermodynamic Equilibrium of a Laser-Produced Aluminum Plasma

2005 ◽  
Vol 59 (4) ◽  
pp. 529-536 ◽  
Author(s):  
Olivier Barthélemy ◽  
Joëlle Margot ◽  
Stéphane Laville ◽  
François Vidal ◽  
Mohamed Chaker ◽  
...  
Keyword(s):  
Excited States ◽  
Thermodynamic Equilibrium ◽  
Local Thermodynamic Equilibrium ◽  
Short Pulse ◽  
Ambient Air ◽  
Laser Induced Plasma ◽  
Laser Systems ◽  
Aluminum Plasma ◽  
Long Pulse ◽  
Xecl Excimer Laser

In this work, the assumption of local thermodynamic equilibrium (LTE) for a laser-induced plasma in ambient air is examined experimentally using two different laser systems, namely an infrared short-pulse Ti:Sapphire laser and an ultraviolet long-pulse XeCl excimer laser. The LTE assumption is investigated by examining the plasma produced at a laser fluence of 10 J/cm2 from aluminum targets containing iron and magnesium impurities. The excitation temperature is deduced from Boltzmann diagrams built from a large number of spatially integrated neutral iron lines distributed from 3.21 to 6.56 eV. It is shown that at any time after the end of the laser pulse, the neutral excited states are in excellent Boltzmann equilibrium. Detailed investigation of Boltzmann equilibrium further validates previous temperature measurements using less accurate diagrams. However, observations of ion lines provide some evidence that the ionized species do not obey Saha equilibrium, thereby indicating departure from LTE. This could be explained by the fact that the plasma cannot be considered as stationary for these species.

Intensity and Polarization Effects in Short-Pulse Multiphoton Ionization of Xenon

2011 ◽  
Vol 28 (8) ◽  
pp. 083201 ◽  
Author(s):  
Hui-Peng Kang ◽  
Chuan-Liang Wang ◽  
Zhi-Yang Lin ◽  
Yong-Ju Chen ◽  
Ming-Yan Wu ◽  
...  
Keyword(s):  
Short Pulse ◽  
Multiphoton Ionization ◽  
Polarization Effects

Dichroism in short-pulse two-color XUV plus IR multiphoton ionization of atoms

2012 ◽  
Vol 85 (5) ◽  
Author(s):  
A. K. Kazansky ◽  
A. V. Grigorieva ◽  
N. M. Kabachnik
Keyword(s):  
Short Pulse ◽  
Multiphoton Ionization

scholarly journals Multiphoton Ionization and Fragmentation of CS2 Under Intense Short Pulse Laser Radiation

1999 ◽  
Vol 18 (3) ◽  
pp. 129-142 ◽  
Author(s):  
E. Koudoumas ◽  
R. De Nalda ◽  
C. Fotakis ◽  
S. Couris
Keyword(s):  
Laser Radiation ◽  
Pulse Laser ◽  
Mass Spectra ◽  
Short Pulse ◽  
Multiphoton Ionization ◽  
Laser Pulses ◽  
Pulse Laser Radiation ◽  
Short Pulse Laser ◽  
Multiply Charged ◽  
Intense Mass

The interaction of CS2 with intense short pulse laser radiation is studied, experimentally using time-of-flight mass spectroscopy. Laser pulses of 0.5 and 5 psec at 248 and 496 nm have been used in order to investigate the effect of the wavelength and the pulse duration on the molecular ionization and fragmentation. As shown, for low enough intensities the parent molecular ion is present as the most important peak in all cases. Increasing the intensity results in extensive fragmentation, where the molecular parent ion remains always the more intense mass peak at 496 nm while at 248 nm S+ dominates the mass spectra. Finally, the production of multiply charged fragments is more efficient at the longer wavelength used.

Triplet excited states of the NH(ND) radical revealed via two photon resonant multiphoton ionization spectroscopy

1992 ◽  
Vol 96 (7) ◽  
pp. 5538-5540 ◽  
Author(s):  
Simon G. Clement ◽  
Michael N. R. Ashfold ◽  
Colin M. Western ◽  
Russell D. Johnson ◽  
Jeffrey W. Hudgens
Keyword(s):  
Excited States ◽  
Multiphoton Ionization ◽  
Two Photon ◽  
Multiphoton Ionization Spectroscopy ◽  
Triplet Excited States
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