The influence of laser pulse on the photoabsorption spectra of Li atom in strong external field

2006 ◽  
Vol 49 (2) ◽  
pp. 178-186 ◽  
Author(s):  
Dehua Wang ◽  
Shenglu Lin
Keyword(s):  
Laser Pulse ◽  
External Field ◽  
Strong External Field

Vacuum polarization in a strong external field

1988 ◽  
Vol 38 (10) ◽  
pp. 5066-5075 ◽  
Author(s):  
Gerhard Soff ◽  
Peter J. Mohr
Keyword(s):  
External Field ◽  
Vacuum Polarization ◽  
Strong External Field

scholarly journals Delbrück scattering in a strong external field

1992 ◽  
Vol 45 (8) ◽  
pp. 2982-2987 ◽  
Author(s):  
Alexander Scherdin ◽  
Andreas Schäfer ◽  
Walter Greiner ◽  
Gerhard Soff
Keyword(s):  
External Field ◽  
Strong External Field

Self-focusing and self-channelling of short circularly laser pulses propagating in a magnetized plasma channel

2015 ◽  
Vol 81 (5) ◽  
Author(s):  
Davood Hassanpour ◽  
Mohammad Ghorbanalilu
Keyword(s):  
Laser Pulse ◽  
External Field ◽  
Plasma Channel ◽  
Pulse Length ◽  
Spot Size ◽  
Magnetized Plasma ◽  
Nonlinear Propagation ◽  
Relativistic Case ◽  
Left Turn ◽  
The Right

In this study, non-paraxial nonlinear propagation of a relativistic laser pulse with linear and circular polarization in a preformed plasma channel having a parabolic density profile is investigated. The circular laser spot size variation in the absence/presence of an external longitudinal magnetic field is separately analysed and the results are compared. The amplitude of oscillation is decreased in the relativistic case, but it is changed in the presence of an external field. The right-turn circular pulse behaviour is completely opposite to that of the left-turn circular pulse in the presence of an external field, because the right-turn pulse is focused later than the left-turn pulse. The effect of nonlinearities on oscillations of spot size is analysed and the nonlinear critical channel depth required for propagation of a self-trapped laser pulse is evaluated. The laser field amplitude is derived for a matched pulse and it is shown that the group velocity dispersion effect causes broadening of the pulse length.

A rate equation method for the sequential double ionisation, including autoionising state excitation, of a noble gas

Open Physics ◽  
2013 ◽  
Vol 11 (9) ◽  
Author(s):  
Damien Middleton ◽  
Katravulapally Tejaswi ◽  
Lampros Nikolopoulos
Keyword(s):  
External Field ◽  
Numerical Solutions ◽  
Noble Gas ◽  
Time Dependent ◽  
Rate Equations ◽  
Stochastic Field ◽  
Pulse Characteristics ◽  
Ion Species ◽  
Double Ionisation ◽  
Strong External Field

AbstractA set of rate equations have been tested against a more robust set of Time-Dependent Density Matrix (TDDM) equations [D. P. W. Middleton, L. A. A. Nikolopoulos, J. Mod. Opti. 59, 1650 (2012)] by using them to determine the populations of ion species and autoionising states (AIS) in noble gas atoms when interacting with a strong external field. Two field shapes were tested here — sinusoidal and square — and a variety of pulse characteristics were examined, i.e. intensity, duration and photon energy, for the neon atomic system. It was found that the rate equations were sufficiently accurate only when the external field is way off-resonant with the AIS. Moreover, analytical solutions of the rate equations in the square pulse case agree with the numerical solutions for a time-dependent pulse containing many cycles. An attempt to model a stochastic field was also made and it was found that the use of such a field diminished and broadened the ion yield ratio due to the presence of an added bandwidth.

Brownian dynamics of polymeric chain in strong external field

1994 ◽  
Vol 81 (1) ◽  
pp. 55-62 ◽  
Author(s):  
Iqor M. Neelov ◽  
Julian H. R. Clarke
Keyword(s):  
External Field ◽  
Brownian Dynamics ◽  
Polymeric Chain ◽  
Strong External Field
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