Dissociative excitation study of iron pentacarbonyl molecule

Ribar, Anita; Danko, Marián; Országh, J.; Silva, F. Ferreira da; Utke, Ivo; Matejčík, Štefan

doi:10.1140/epjd/e2015-50755-x

Cited by 14 publications

(12 citation statements)

References 17 publications

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“…Iron pentacarbonyl, which was selected for the present study, is a common and well-explored deposition precursor. − The structure and bonding of the molecule are well known. − In the context of focused particle beam deposition, it has been studied in collisions with electrons at low and medium energies in the gas phase, ,− in clusters, , and deposited on surfaces. − However, we are not aware of any study concerning the behavior of Fe(CO) 5 , or a different FIBID precursor, after ion irradiation at relevant kinetic energies. This field is largely unexplored.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of Iron Pentacarbonyl Induced by Singly and Multiply Charged Ions and Implications for Focused Ion Beam-Induced Deposition

et al. 2019

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Focused ion beams are becoming important tools in nanofabrication. The underlying physical processes in the substrate were already explored for several projectile ions. However, studies of ion interaction with precursor molecules for beam-assisted deposition are almost nonexistent. Here, we explore the interaction of various projectile ions with iron pentacarbonyl. We report fragmentation patterns of isolated gas-phase iron pentacarbonyl after interaction with 4He+ at a collision energy of 16 keV, 4He2+ at 16 keV, 20Ne+ at 6 keV, 20Ne4+ at 40 keV, 40Ar+ at 3 keV, 40Ar3+ at 21 keV, 84Kr3+ at 12 keV, and 84Kr17+ at 255 keV. These projectiles cover interaction regimes ranging from collisions dominated by nuclear stopping through collisions dominated by electronic stopping to soft resonant electron-capture interactions. We report a surprising efficiency of Ne+ in the Fe(CO)5 decomposition. The interaction with multiply charged ions results in a higher content of parent ions and slow metastable fragmentation due to the electron-capture process. The release of CO groups during the decomposition process seems to take off a significant amount of energy. The fragmentation mechanism may be described as Fe being trapped within a CO cluster.

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Section: Introductionmentioning

confidence: 99%

Decomposition of Iron Pentacarbonyl Induced by Singly and Multiply Charged Ions and Implications for Focused Ion Beam-Induced Deposition

et al. 2019

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“…only emission from the immediate dissociation and not electron impact excitation of the fragments is observed before the fragments exit the field of view. Ribar et al (2015) reported emission lines of Fe I from emissive dissociation of iron carbonyl, including the strongest Fe I emission in the spectra of Hyakutake at ∼372 nm. We have found no comparable spectra in the literature for collision experiments involving nickel carbonyl, Ni(CO) 4 , but the sizable production of Ni + in photoionization studies suggests similarities to the dissociation of the iron carbonyl.…”

Section: Chemical Origins and Physical Processesmentioning

confidence: 99%

“…The production of neutral fragment(s) from iron carbonyl dissociation have also been studied in electron impact at 50 eV by Ribar et al (2015). Their apparatus operates in the single collision regime, i.e.…”

Section: Chemical Origins and Physical Processesmentioning

confidence: 99%

Atomic iron and nickel in the coma of C/1996 B2 (Hyakutake): production rates, emission mechanisms, and possible parents

Bromley¹,

Neff²,

Loch³

et al. 2021

Preprint

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Recently, it has been discovered that gaseous nickel and iron is present in most comets. To evaluate the state of the laboratory data in support of these identifications, we re-analyzed archived spectra of comet C/1996 B2 (Hyakutake), one of the nearest and brightest comets of the last century, using a combined experimental and computational approach. We developed a new, many-level fluorescence model that indicates that the fluorescence emission of Fe I and Ni I vary greatly with heliocentric velocity. Combining this model with laboratory spectra of an Fe-Ni plasma, we identified 23 lines of Fe I and 14 lines of Ni I in the spectrum of Hyakutake. Using Haser models, we estimate the nickel and iron production rates as Q Ni = 2.6−4.1×10 22 s −1 and Q Fe = 0.4−2.6×10 23 s −1 . From derived column densities the Ni/Fe abundance ratio log 10 [Ni/Fe] = −0.38±0.06 deviates significantly from solar, and it is consistent with the ratios observed in solar system comets. Spectra from several offset distances show profiles consistent with a short-lived parent and/or emissive photodissociation of an unknown parent species. Possible production and emission mechanisms are analyzed in context of existing laboratory measurements. Based on the observed spatial distributions, excellent fluorescence model agreement, and Ni/Fe ratio, our findings support an origin consisting of dissociation of an unknown parent followed by fluorescence emission. Our findings suggest that the strong heliocentric velocity dependence of the fluorescence efficiencies can provide a meaningful test of the physical process responsible for the Fe I and Ni I emission.

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“…Another class of electron interactions addressed in the topical issue are inelastic electron scattering processes with atoms and molecules such as exploration of the singly and doubly excited states of neon at high incident electron energies [13] as well as two papers dealing with electron impact excitation studies producing emission spectra of Se n and Fe(CO) 5 [14,15]. The interaction of positron interactions with atoms is represented by one paper dealing with the theoretical calculation of the cross section for Xray production from the L-shell excitation of Ag, In and Sn atoms after positron impact [16].…”

Section: Topics Coveredmentioning

confidence: 99%

Elementary processes with atoms and molecules in isolated and aggregated states

et al. 2015

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Abstract. This topical issue on "Elementary processes with atoms and molecules in isolated and aggregated states" was motivated by the 6th Conference on Elementary Processes in Atomic Systems -CEPAS, which was held from July 9-12, 2014 in Bratislava, Slovakia. The conference program overlaps with the topic of this issue. The scientific papers in the topical issue cover the fields of electron, positron, ion and photon interactions with atoms, molecules and surfaces.

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Dissociative excitation study of iron pentacarbonyl molecule

Cited by 14 publications

References 17 publications

Decomposition of Iron Pentacarbonyl Induced by Singly and Multiply Charged Ions and Implications for Focused Ion Beam-Induced Deposition

Decomposition of Iron Pentacarbonyl Induced by Singly and Multiply Charged Ions and Implications for Focused Ion Beam-Induced Deposition

Atomic iron and nickel in the coma of C/1996 B2 (Hyakutake): production rates, emission mechanisms, and possible parents

Elementary processes with atoms and molecules in isolated and aggregated states

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