Secondary ion emission from condensed CO bombarded by fission fragments

Farenzena, L. S.; Martínez, R.; Iza, Peter; Ponciano, C.R.; Homem, M. G. P.; Brito, A. Naves de; Silveira, E.F. da; Wien, K.

doi:10.1016/j.ijms.2005.12.006

Cited by 30 publications

(38 citation statements)

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“…An overview of the radiation effects on ice chemistry has been published by Hudson and Moore [4] and the chemistry in CO 2 -H 2 O ice induced by magnetospheric plasma ion bombardment has been discussed by Delitsky and Lane [5]. Less attention has been given to CO ice electronic sputtering, one of the reasons for which its secondary ion mass spectrometry (SIMS) analysis employing MeV heavy ion bombardment was revised recently by the authors [6].…”

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confidence: 99%

“…Our experimental investigations started on pure frozen H 2 O [7] and then on frozen gas mixtures of H 2 O and CO 2 [8,9] using targets at liquid nitrogen temperature, which is close to the sublimation temperature of solid CO 2 . Very recently, a He cryostat became available, providing target temperatures down to ϳ25 K. Initially, the new instrumentation was used to investigate pure frozen CO targets at 25 K [6]. Then, the studies were extended to frozen CO 2 to allow a comparison of the two carbon oxide ices.…”

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confidence: 99%

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Electronic sputtering produced by fission fragments on condensed CO and CO₂

Ponciano

Martínez

Farenzena

et al. 2006

J. Am. Soc. Mass Spectrom.

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Condensed CO and CO2 are bombarded by approximately 65 MeV 252Cf fission fragments and the desorbed ions are analyzed by time-of-flight mass spectrometry as a function of target temperature, in the ranges 25-33 K and 75-91 K, respectively. Absolute desorption yields are measured up to complete ice sublimation. The mass spectra of both ice targets reveal the emission of: (1) low mass ions, produced by direct Coulomb interaction of the highly charged projectiles and delta-electrons with CO and CO2, and (2) pronounced series of cluster ions. The basic ice cluster structures (CO)n and (CO2)n are present in the emitted cluster series such as (CO)nCO+, (CO2)nCO2+, or (CO2)nCO3-. In the case of CO ice, however, the intense production of the series Cn+, Cn-, and (CO)mCn+ shows that Cn is the main cluster structure, consequence of a higher concentration of free carbon atoms in the nuclear track plasma of CO ice than in that of CO2 ice. Ion cluster abundance is observed to decrease exponentially with cluster mass. The decay constant is k(n) congruent with 0.13, about the same for series based on (CO)n and (CO2)n, but a factor 3.3 higher for the Cn series. The Cn clusters are formed by gas-phase condensation, but the (CO)n and (CO2)n clusters are produced by fracturing of the highly excited solid around the nuclear track. A dramatic reduction of the ion desorption yield is observed near T = 29 K for CO and near T = 85 K for CO2, when fast sublimation occurs and ice thickness vanishes. Close to sublimation temperature, the decay constant of the (CO)2Cn+ series increases due to a decreasing formation probability of large Cn clusters.

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confidence: 99%

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confidence: 99%

Electronic sputtering produced by fission fragments on condensed CO and CO₂

Ponciano

Martínez

Farenzena

et al. 2006

J. Am. Soc. Mass Spectrom.

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“…In the case of CO 2 -H 2 O mixture, it is reported that C n H x + ions are desorbed by the bombardment of MeV N 2+ ions and fission fragments [4]. For frozen CO, it is also reported that cluster ions such as (CO) m C n + are desorbed by the bombardment of 65 MeV fission fragments [6]. Cluster ions in these works are formed through weak interaction such as Van-der-Waals force [12,13] and hydrogen bonds.…”

Section: Methodsmentioning

confidence: 99%

“…It was proposed that organic and biological molecules such as amino acids and bases can be formed in space through these reactions [2][3][4][5]. For ion desorption, it was reported that large cluster ions are desorbed from frozen CO, CO 2 , H 2 O, NH 3 and their mixtures through electronic excitation when the target is irradiated with high-energy ions in the MeV order and fission fragments [4][5][6][7][8][9]. For low-energy ion irradiation, desorption of cluster ions from frozen N 2 by keV Ar + , Kr + , and Xe + ion irradiations was reported [10], and desorption of molecular ions from Ar/Xe and Ar/N 2 mixtures by 400 eV He + ion irradiation was also observed [11].…”

Section: Introductionmentioning

confidence: 99%

Desorption of cluster ions from adsorbed methane under cryogenic condition by low-energy ion irradiation

Narita

Honda

Hirao

et al. 2008

Applied Surface Science

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“…The emission of neutral clusters is also expected to produce a high yield, as discussed by Ponciano et al (2008) for the condensed O 2 target. The sputtering of ion species from CO bombarded by 65 MeV heavy-ions was measured by Farenzena et al (2006) using time-of-flight mass spectrometry, CO + being one of the most abundant secondary ion. Defining the radiochemical yield as G = 100σ d /S e , the values obtained for the 50 and 537 MeV Ni ions are G = 5.9 molecules/(100 eV) and G = 2.5 molecules/(100 eV), respectively.…”

Section: Quantitative Analysismentioning

confidence: 99%

Laboratory simulation of heavy-ion cosmic-ray interaction with condensed CO

Duarte

Domaracka²,

Boduch³

et al. 2010

A&A

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Context. Within dense interstellar clouds, from their periphery to regions deep inside, ice mantles on dust grains are exposed to cosmic-ray irradiation. Various swift ions contribute from protons to iron in the keV to TeV energy range. Observations show that in some lines of sight condensed CO molecules are an important component of the ice. Aims. We irradiate CO ices with Ni ions of relatively high energy (50 and 537 MeV) to simulate the effects produced by fast heavy cosmic-ray ions in interstellar grain mantles. Methods. CO gas is condensed on a CsI substrate at 13 K and irradiated by 50 MeV 58 Ni 13+ and 537 MeV 64 Ni 24+ ions up to a final fluence of ≈1 × 10 13 cm −2 , at a flux of 1 × 10 9 cm −2 s −1 . The sputtering yields, the destruction rate of CO, and the rate of formation of new molecular species are measured in situ by Fourier transform infrared spectroscopy (FTIR). Results. The measured CO destruction cross-sections and sputtering yields induced by Ni ions are, respectively, (i) for 50 MeV, σ d = 1.0 × 10 −13 cm 2 and Y = 7 × 10 4 molecules/impact; (ii) for 537 MeV, σ d = 3.0 × 10 −14 cm 2 and Y = 5.85 × 10 4 molecules/impact. Based on the present and previous results, the desorption rates induced by H, Ni, and Fe ions are estimated for a wide range of energies. The contribution of the heavy ions is found to dominate over that of protons in the interstellar medium.

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Secondary ion emission from condensed CO bombarded by fission fragments

Cited by 30 publications

References 38 publications

Electronic sputtering produced by fission fragments on condensed CO and CO₂

Electronic sputtering produced by fission fragments on condensed CO and CO₂

Desorption of cluster ions from adsorbed methane under cryogenic condition by low-energy ion irradiation

Laboratory simulation of heavy-ion cosmic-ray interaction with condensed CO

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Secondary ion emission from condensed CO bombarded by fission fragments

Cited by 30 publications

References 38 publications

Electronic sputtering produced by fission fragments on condensed CO and CO2

Electronic sputtering produced by fission fragments on condensed CO and CO2

Desorption of cluster ions from adsorbed methane under cryogenic condition by low-energy ion irradiation

Laboratory simulation of heavy-ion cosmic-ray interaction with condensed CO

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Electronic sputtering produced by fission fragments on condensed CO and CO₂

Electronic sputtering produced by fission fragments on condensed CO and CO₂