Fragmentation and Coulomb explosion of deuterium clusters by the interaction with intense laser pulses

Isla, M.; Alonso, J. A.

doi:10.1103/physreva.72.023201

Cited by 16 publications

(21 citation statements)

References 30 publications

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“…II A͒ is n BSI = N BSI / n and the EII level ͑calculated using the procedure of Sec. [42][43][44][45][46][47] The simulated values of n ii L ͑at t L Ӎ 92 fs͒ exhibit an irregular cluster size dependence at different values of I M . 1, reveals saturation or near saturation of the inner ionization level.…”

Section: B Gross Features Of Inner Ionizationmentioning

confidence: 91%

“…2,3,10,11,16,17,[21][22][23] Inner ionization results in the formation of a charged, energetic nanoplasma within the cluster or in its vicinity, which is followed by the partial or complete outer ionization of the nanoplasma. 4,6,9,[21][22][23][24]26,29,32,45,50,58,59 Microscopic models for the cluster inner ionization level were based on the barrier suppression ionization ͑BSI͒ model. 3,15,16,21,22,26,29,33,52,53 Cluster multielectron ionization, nanoplasma dynamics and response were explored by theoretical models 2,3,6,7,[16][17][18]21,23,32,33,36,38,[54][55][56]…”

Section: Introductionmentioning

confidence: 99%

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Extreme ionization of Xe clusters driven by ultraintense laser fields

Heidenreich

Last

Jortner

2007

The Journal of Chemical Physics

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We applied theoretical models and molecular dynamics simulations to explore extreme multielectron ionization in Xe(n) clusters (n=2-2171, initial cluster radius R(0)=2.16-31.0 A) driven by ultraintense infrared Gaussian laser fields (peak intensity I(M)=10(15)-10(20) W cm(-2), temporal pulse length tau=10-100 fs, and frequency nu=0.35 fs(-1)). Cluster compound ionization was described by three processes of inner ionization, nanoplasma formation, and outer ionization. Inner ionization gives rise to high ionization levels (with the formation of [Xe(q+)](n) with q=2-36), which are amenable to experimental observation. The cluster size and laser intensity dependence of the inner ionization levels are induced by a superposition of barrier suppression ionization (BSI) and electron impact ionization (EII). The BSI was induced by a composite field involving the laser field and an inner field of the ions and electrons, which manifests ignition enhancement and screening retardation effects. EII was treated using experimental cross sections, with a proper account of sequential impact ionization. At the highest intensities (I(M)=10(18)-10(20) W cm(-2)) inner ionization is dominated by BSI. At lower intensities (I(M)=10(15)-10(16) W cm(-2)), where the nanoplasma is persistent, the EII contribution to the inner ionization yield is substantial. It increases with increasing the cluster size, exerts a marked effect on the increase of the [Xe(q+)](n) ionization level, is most pronounced in the cluster center, and manifests a marked increase with increasing the pulse length (i.e., becoming the dominant ionization channel (56%) for Xe(2171) at tau=100 fs). The EII yield and the ionization level enhancement decrease with increasing the laser intensity. The pulse length dependence of the EII yield at I(M)=10(15)-10(16) W cm(-2) establishes an ultraintense laser pulse length control mechanism of extreme ionization products.

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Section: B Gross Features Of Inner Ionizationmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Extreme ionization of Xe clusters driven by ultraintense laser fields

Heidenreich

Last

Jortner

2007

The Journal of Chemical Physics

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“…It is possible to use this method to study particle dynamics under strong laser pulses [16,18,19,20,21,22]. …”

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confidence: 99%

Carbonyl sulphide under strong laser field: Time-dependent density functional theory

Bilalbegović

2008

Eur. Phys. J. D

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To be published in The European Physical Journal D Abstract. The first 52 fs of a time evolution of the electron density in OCS after an interaction with an intense sub 10 fs laser pulse are studied using the time-dependent density functional theory. The nuclear motion in this linear trimer is simulated by the classical molecular dynamics method. Laser fields of intensity 10 13 W/cm 2 and 10 15 W/cm 2 are used. Details of the laser induced changes of the structure, as well as the ionization rate are sensitive to the applied field intensity and its polarization. It is found that under suitable conditions the OCS molecule bends soon after an interaction with a laser pulse. A deviation from the linear geometry of up to 23.6• and charged ions of up to +3 are observed. The time evolution of electric dipole moments and the time-dependent electron localization function (ELF) are also studied.

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“…Cluster multielectron ionization, nanoplasma dynamics and response were explored by theoretical models 16,25,26,29,31,44,45,62‐65 and by computer simulations 13,18,29‐32,34,37,40,53,58,63,65 . Microscopic models for the cluster inner ionization level were based on the barrier suppression ionization (BSI) model 30,64,65 .…”

Section: Methodsmentioning

confidence: 99%

Extreme multielectron ionization of elemental clusters in ultraintense laser fields

Heidenreich

Jortner

2007

Israel Journal of Chemistry

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In this paper we present computational and theoretical studies of extreme multielectron ionization in Xen clusters (n = 55‐2171, initial cluster radii R0 = 8.7‐31.0 Å) driven by ultraintense Gaussian infrared laser fields (peak intensity IM = 1015‐1020 W cm−2, temporal pulse length τ = 10‐100 fs, and frequency v = 0.35fs−1). The microscopic approach, which rests on three sequential‐parallel processes of inner ionization, nanoplasma formation, and outer ionization, properly describes the high ionization levels (with the formation of {Xeq+}n with q = 5‐36), the inner/outer cluster ionization mechanisms, and the nanoplasma response. The cluster size and laser intensity dependence of the inner ionization levels are determined by a complex superposition of laser‐induced barrier suppression ionization (BSI), with the contributions of the inner field BSI manifesting ignition enhancement and screening retardation effects, together with electron impact ionization. The positively charged nanoplasma produced by inner ionization reveals intensity‐dependent spatial inhomogeneity and spatial anisotropy, and can be either persistent (at lower intensities) or transient (at higher intensities). The nanoplasma is depleted by outer ionization that was semiquantitatively described by the cluster barrier suppression electrostatic model, which accounts for the cluster size, laser intensity, and pulse length dependence of the outer ionization yield.

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Fragmentation and Coulomb explosion of deuterium clusters by the interaction with intense laser pulses

Cited by 16 publications

References 30 publications

Extreme ionization of Xe clusters driven by ultraintense laser fields

Extreme ionization of Xe clusters driven by ultraintense laser fields

Carbonyl sulphide under strong laser field: Time-dependent density functional theory

Extreme multielectron ionization of elemental clusters in ultraintense laser fields

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