Electronic Sputtering Analysis of Astrophysical Ices

Farenzena, L. S.; Iza, Peter; Martínez, R.; Fernandez-Lima, Francisco; Duarte, Eduardo Seperuelo; Faraudo, G.S.; Ponciano, C.R.; Homem, M. G. P.; Brito, A. Naves de; Wien, K.; Silveira, E.F. da

doi:10.1007/s11038-006-9081-y

Cited by 38 publications

(42 citation statements)

References 27 publications

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“…Atomic defect creation in the bulk proceeds the most likely via the reaction of dissociative recombination of N 3 + with electron. These findings are in agreement with the detection of cluster ions (N 2 ) n N 2 + and (N 2 ) n N + sputtering by fast ion collisions [48].…”

Section: Discussionsupporting

confidence: 91%

Charged defects and defect‐induced processes in nitrogen films

Savchenko

Khyzhniy

Uyutnov

et al. 2014

Phys. Status Solidi C

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Radiation effects in solid nitrogen irradiated with an electron beam were studied with emphasis on the role of charged centers in radiation‐induced phenomena. The experiments were performed employing luminescence method and activation spectroscopy techniques – spectrally resolved thermally stimulated luminescence TSL and thermally stimulated exoelectron emission. Samples were probed in depth by varying electron energy, thus discriminating radiation‐induced processes in the bulk and at the surface. Spectroscopic evidence of the excited N2* (C3Πu) molecule desorption was obtained for the first time and mechanism of the phenomenon based on recombination of electron with intrinsic charged center N4+ was proposed. The key role of N3+ center dissociative recombination in generation of N radicals is suggested. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Discussionsupporting

confidence: 91%

Charged defects and defect‐induced processes in nitrogen films

Savchenko

Khyzhniy

Uyutnov

et al. 2014

Phys. Status Solidi C

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“…These desorption mechanisms compete with the gas condensation, thereby setting a steady-state chemistry condition within molecular clouds (Charnley et al 2001). Irradiation of astrophysical ices, such as H 2 O, CO 2 , CO, and NH 3 , by heavy ions have been recently investigated either by plasma desorption mass spectrometry (Collado et al 2004;Farenzena et al 2005;Ponciano et al 2006;Martinez et al 2006) or by infrared spectroscopy (FTIR) (Seperuelo Duarte et al 2009Pilling et al 2010). This kind of data may be useful for estimating desorption rates of the interstellar grains attributed to HGCR (Bringa & Johnson 2004).…”

Section: Introductionmentioning

confidence: 99%

Cosmic ray impact on astrophysical ices: laboratory studies on heavy ion irradiation of methane

Barros

Bordalo

Duarte

et al. 2011

A&A

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Laboratory data of CH 4 ice radiolysis promoted by fast heavy ions are obtained by infrared spectroscopy (FTIR). CH 4 molecules are condensed on a CsI substrate at 15 K, and the ice layer is bombarded by 220 MeV 16 O 7+ ion beam. The ice thickness is thin enough to be traversed by projectiles at constant velocity close to the equilibrium charge state. The induced CH 4 dissociation gives rise to the formation of molecular species CH 3 , C 2 H 2 , C 2 H 4 , C 2 H 6 , and C 3 H 8 . Their formation and dissociation cross sections are determined. C 2 H 6 represent the most abundant daughter molecules. The carbon budget analysis of CH 4 and its radiolysis products shows that the column density of carbon atoms contained in the methane destroyed during ion irradiation is 30−50% greater than the sum for the column densities of the newly formed species. As an astrophysical implication, the current results allow estimation of chemical reaction rates in ices covering interstellar grains.

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“…The generation of ion clusters from several condensed gases has been recently studied by $60 MeV 252 Cf fission fragment (FF) impact on ice surfaces at controlled temperature [1][2][3][4][5][6][7]. Processes in which very fast and highly charged projectiles induce electronic sputtering on low-temperature condensed-gas solids (ices) are relevant since they occur in cometary's surfaces and outer-solar-system bodies [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Processes in which very fast and highly charged projectiles induce electronic sputtering on low-temperature condensed-gas solids (ices) are relevant since they occur in cometary's surfaces and outer-solar-system bodies [7][8][9][10][11][12]. When the target is a frozen gas with low molecular weight such as nitrogen, one might expect that the desorbed species would be mostly atoms or small molecules with small number of constituents because these gases condensate only through weak van der Waals interactions.…”

Section: Introductionmentioning

confidence: 99%

“…When the target is a frozen gas with low molecular weight such as nitrogen, one might expect that the desorbed species would be mostly atoms or small molecules with small number of constituents because these gases condensate only through weak van der Waals interactions. However, the emission of a large number of cluster ions N þ n has been observed in experiments with 252 Cf FF (n up to $22) [7], with keV He + ion bombardment (n up to $30) [8] and with 1.5 MeV/u Ar 13+ ion impact (n up to $20) [11]. Since many of the clusters' characteristics (e.g.…”

Section: Introductionmentioning

confidence: 99%

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