Rayleigh Instabilities in Multiply Charged Sodium Clusters

Chandezon, F.; Tomita, S.; Cormier, D.; Grübling, P.; Guet, C.; Lebius, H.; Pesnelle, A.; Huber, B. A.

doi:10.1103/physrevlett.87.153402

Cited by 43 publications

(40 citation statements)

References 23 publications

(22 reference statements)

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“…[23] The nucleobase powder was evaporated in an oven at temperatures around 200 8C. Aggregation of the vapor occurred by supersaturation in a He atmosphere (p in the mbar range) at liquid-nitrogen temperature.…”

Section: Methodsmentioning

confidence: 99%

Ion‐Induced Biomolecular Radiation Damage: From Isolated Nucleobases to Nucleobase Clusters

et al. 2006

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A large number of studies are devoted to the investigation of the biomolecular ionization and fragmentation dynamics underlying biological radiation damage. Most of these studies have been based on gas-phase collisions with isolated DNA building blocks. The radiobiological significance of these studies is often questioned because of the lack of a chemical environment. To clarify this aspect, we studied interactions of keV ions with isolated nucleobases and with nucleobase clusters by means of coincidence time-of-flight spectrometry. Significant changes already show up in the molecular fragmentation patterns of very small clusters.

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Section: Methodsmentioning

confidence: 99%

Ion‐Induced Biomolecular Radiation Damage: From Isolated Nucleobases to Nucleobase Clusters

et al. 2006

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“…As single ionization by singly charged projectiles occurs at as maller mean impact parameter compared to multiply charged projectile ions, one can expect ah ighert ransfer of excitation energyd uring the collisions involving the former. [32,33] The ratios of radical cations to protonated lactic acid monomers together with the corresponding uncertainties are reported in Table 1. These ratios were determined from the area of the two fitting Gaussian functions (Figure 2), andu ncertainties on both their amplitude and width were taken into account.…”

Section: Protonated Versus Radical Cation Monomermentioning

confidence: 99%

Formation and Fragmentation of Protonated Molecules after Ionization of Amino Acid and Lactic Acid Clusters by Collision with Ions in the Gas Phase

et al. 2015

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Collisions between O(3+) ions and neutral clusters of amino acids (alanine, valine and glycine) as well as lactic acid are performed in the gas phase, in order to investigate the effect of ionizing radiation on these biologically relevant molecular systems. All monomers and dimers are found to be predominantly protonated, and ab initio quantum-chemical calculations on model systems indicate that for amino acids, this is due to proton transfer within the clusters after ionization. For lactic acid, which has a lower proton affinity than amino acids, a significant non-negligible amount of the radical cation monomer is observed. New fragment-ion channels observed from clusters, as opposed to isolated molecules, are assigned to the statistical dissociation of protonated molecules formed upon ionization of the clusters. These new dissociation channels exhibit strong delayed fragmentation on the microsecond time scale, especially after multiple ionization.

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“…For hydrogen-bonded finite systems fission was recorded for droplets below the Rayleigh fissibility limit (X ϭ 1) at X ϭ 0.7 (T. Leisner, personal communication) and at X Ͻ 1 (31-33). For multiply charged metal clusters, the maximal value of X ϭ 0.85 Ϯ 0.07 for Na n ϩz was recorded (14,15), although these clusters were not yet produced with a sufficiently large enough charge to overcome the Rayleigh limit. A new fragmentation pattern beyond cluster fission was experimentally recorded (12) for highly charged Na n clusters produced by collision with multicharged Xe 20ϩ ions, with the emission of a large number of singly charged monomers and leaving a single heavy residue of low charge.…”

Section: Epiloguementioning

confidence: 99%

“…The values of (Z 2 ͞n) cr , which correspond to the Rayleigh instability for the onset of barrierless fission (X ϭ 1), reflect on the quantitative difference between the surface properties of nuclear matter held by strong cohesive interactions and of molecular matter held by chemical and van der Waals binding. All of the ubiquitous phenomena of fission were experimentally realized for the fissibility parameter below the Rayleigh instability limit of X ϭ 1, i.e., nuclear fission (36), the fission of metal clusters (14,15), and of hydrogen-bonded clusters (31)(32)(33). In all these diversely charged finite systems (with X Ͻ1), thermally activated fission is dominated by the geometry and the topology of the potential energy hypersurface (4).…”

mentioning

confidence: 99%

Beyond the Rayleigh instability limit for multicharged finite systems: From fission to Coulomb explosion

Levy¹,

Jortner²

2002

Proc. Natl. Acad. Sci. U.S.A.

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We address the stability of multicharged finite systems driven by Coulomb forces beyond the Rayleigh instability limit. Our exploration of the nuclear dynamics of heavily charged Morse clusters enabled us to vary the range of the pair potential and of the fissibility parameter, which results in distinct fragmentation patterns and in the angular distributions of the fragments. The Rayleigh instability limit separates between nearly binary (or tertiary) spatially unisotropic fission and spatially isotropic Coulomb explosion into a large number of small, ionic fragments. Implications are addressed for a broad spectrum of dynamics in chemical physics, radiation physics of ultracold gases, and biophysics, involving the fission of clusters and droplets, the realization of Coulomb explosion of molecular clusters, the isotropic expansion of optical molasses, and the Coulomb instability of ''isolated'' proteins.T he fragmentation of multiply charged finite systems driven by long-range Coulomb forces (1-33) or their analogue (34), i.e., nuclei (1-4), clusters (5-29), droplets (30-33), and optical molasses (34), raises some interesting questions regarding the energetics and dynamics of dissociation. How does a finite system respond to a large excess charge (1-33) or effective charge (34)? What are the topography and topology of the multidimensional energy landscape (4, 35) that guide the system's shape evolution and fragmentation? What are the fragmentation channels and under what conditions are they realized? What is the interplay between fission, i.e., instability toward dissociation, of the finite system into two (or a small number of) fragments and Coulomb explosion (17-29) into a large number ϳn (where n is the number of constituents) of ionic species? On the basis of molecular dynamics simulations of the fragmentation patterns of heavily charged Morse clusters we established that the Rayleigh instability limit (30) separates between nearly binary (or tertiary) spatially unisotropic fission and spatially isotropic Coulomb explosion into a large number of ionic fragments.The ubiquity of fission phenomena of droplets (30-33), nuclei (1-4), and clusters (5-16) was traditionally described by the liquid drop model (LDM) of Lord Rayleigh (30), Meitner and Frisch (2), and Wheeler and Bohr (1), where a classical charged drop deforms through elongated shapes to form separate droplets. The fissibility parameter X ϭ E(Coulomb)͞2E(surface) characterizes the relative contribution of repulsive (Coulomb) and cohesive (surface) energies to the fission barrier, separating between the bound initial states and the fission products. For X Ͻ 1, thermally activated fission over the barrier prevails. At the Rayleigh instability limit of X ϭ 1, the barrier height is zero (1, 30). Many features of nuclear and metal cluster fission go beyond the physics of a classical liquid droplet and require the incorporation of quantum shell structure and dynamics (4, 10). Nevertheless, the simple LDM expression X ϭ Z 2 e 2 ͞16␥R 3 ϭ (Z 2 ͞n)͞(Z 2 ͞n) cr w...

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Rayleigh Instabilities in Multiply Charged Sodium Clusters

Cited by 43 publications

References 23 publications

Ion‐Induced Biomolecular Radiation Damage: From Isolated Nucleobases to Nucleobase Clusters

Ion‐Induced Biomolecular Radiation Damage: From Isolated Nucleobases to Nucleobase Clusters

Formation and Fragmentation of Protonated Molecules after Ionization of Amino Acid and Lactic Acid Clusters by Collision with Ions in the Gas Phase

Beyond the Rayleigh instability limit for multicharged finite systems: From fission to Coulomb explosion

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