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• W4292182227 abstract "Abstract We investigated the effect of higher order dispersion on ultrafast photoionisation with Classical Trajectory Monte Carlo (CTMC) method for hydrogen and krypton atoms. In our calculations we used linearly polarised ultrashort 7 fs laser pulses, $$6.5 times 10^{14} mathrm {W/cm^{2}}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>6.5</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mn>14</mml:mn> </mml:msup> <mml:mrow> <mml:mi>W</mml:mi> <mml:mo>/</mml:mo> <mml:msup> <mml:mi>cm</mml:mi> <mml:mn>2</mml:mn> </mml:msup> </mml:mrow> </mml:mrow> </mml:math> intensity, and a central wavelength of 800 nm. Our results show that electrons with the highest kinetic energies are obtained with transform limited (TL) pulses. The shaping of the pulses with negative second- third- or fourth- order dispersion results in higher ionisation yield and electron energies compared to pulses shaped with positive dispersion values. We have also investigated how the Carrier Envelope Phase (CEP) dependence of the ionisation is infuenced by dispersion. We calculated the left-right asymmetry as a function of energy and CEP for sodium atoms employing pulses of 4.5 fs, 800 nm central wavelength, and $$4 times 10^{12}mathrm {W/cm^{2}}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>4</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mn>12</mml:mn> </mml:msup> <mml:mrow> <mml:mi>W</mml:mi> <mml:mo>/</mml:mo> <mml:msup> <mml:mi>cm</mml:mi> <mml:mn>2</mml:mn> </mml:msup> </mml:mrow> </mml:mrow> </mml:math> intensity. We found that the left-right asymmetry is more pronounced for pulses shaped with positive Group Delay Dispersion (GDD). It was also found that shaping a pulse with increasing amounts of GDD in absolute value blurs the CEP dependence, which is attributed to the increasing number of optical cycles." @default.
• W4292182227 created "2022-08-18" @default.
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• W4292182227 date "2022-08-16" @default.
• W4292182227 modified "2023-10-09" @default.
• W4292182227 title "Study of the effect of higher-order dispersions on photoionisation induced by ultrafast laser pulses applying a classical theoretical method" @default.
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• W4292182227 doi "https://doi.org/10.1038/s41598-022-18034-w" @default.
• W4292182227 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35974085" @default.
• W4292182227 hasPublicationYear "2022" @default.
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