Mössbauer study of the reaction of laser-evaporated iron atoms with nitrogen molecules in low-temperature argon matrices

Yamada, Yasuhiro; Shimasaki, Hideo; Okamura, Yukako; Katsumata, Keiichi

doi:10.1016/s0969-8043(00)00181-0

Cited by 14 publications

(7 citation statements)

References 12 publications

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“…In catalysis, the dissociation of N 2 over Fe in the Haber process is critical in the production of NH 3 , and an iron dinitrogen intermediate has been suggested in the nitrogen fixation by the nitrogenase enzyme . The long-standing goal of elucidating mechanisms of the reactions involving dinitrogen has motivated numerous experimental and theoretical investigations of the interactions between iron and dinitrogen. − Molecular adsorption of N 2 onto iron surfaces and clusters indicates that the dissociative chemisorption proceeds slowly and the adsorbed species has been proposed as an intermediate in the catalytic dissociation of N 2 . − The reactions of Fe atoms with N 2 in low temperature matrices have been investigated, and the complicated IR spectra were attributed to several unsaturated iron nitride and iron dinitrogen complexes, among which some species were tentatively assigned. − These species are important models for understanding iron catalyst systems. The bonding nature of iron atoms with nitrogen has been reported by using the powerful technique of density functional theory or other theoretical methods. − …”

Section: Introductionmentioning

confidence: 99%

A Combined Experimental and Theoretical Study of Iron Dinitrogen Complexes: Fe(N₂), Fe(NN)_x (x = 1−5), and Fe(NN)₃⁻

Jiang

2010

J. Phys. Chem. A

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Reactions of laser-ablated iron atoms with dinitrogen in excess neon produce the iron dinitrogen complexes Fe(N(2)), Fe(NN)(x) (x = 1-5), and Fe(NN)(3)(-) through capture of the ablated electron. The reaction products are characterized on the basis of isotopic shifts, mixed isotopic splitting patterns, stepwise annealing, change of reagent concentration and laser energy, CCl(4)-doping experiments, and comparison with theoretical predictions from density functional theory calculations. The overall agreement between the experimental and calculated vibrational frequencies, relative absorption intensities, and isotopic shifts supports the identification of these species from the matrix infrared spectra. Natural bond orbital analysis and reaction pathways for the formation of the products are discussed.

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Section: Introductionmentioning

confidence: 99%

A Combined Experimental and Theoretical Study of Iron Dinitrogen Complexes: Fe(N₂), Fe(NN)_x (x = 1−5), and Fe(NN)₃⁻

Jiang

2010

J. Phys. Chem. A

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“…Maybe, some FeN or FeN 2 molecules are formed in the recondensing plasma. 12 The following fast cooling yields an amorphous or nanocrystalline iron nitride layer. More investigations are necessary to resolve the remaining open questions.…”

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confidence: 99%

Laser nitriding of iron with laser pulses from femtosecond to nanosecond pulse duration

Schaaf

Han

Lieb

et al. 2002

Applied Physics Letters

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Pulsed-laser nitriding is an attractive method to improve metal surface properties, such as hardness, wear, and corrosion resistance, with the advantage of simple experimental setup, rapid treatment, and precise process control. Here, the dependence of the laser nitriding process on the laser pulse duration was investigated over five orders of magnitude in a series of experiments employing pulsed lasers ranging from nanosecond excimer laser pulses (55 ns) and Nd-doped yttrium aluminum garnet (Nd:YAG) laser pulses (8 ns), to ultrashort Ti:sapphire laser pulses (150 fs). The results revealed that for all laser pulse durations and different wavelengths a large nitriding effect was observed. The excimer laser shows the highest nitriding efficiency. The basic processes for the femtosecond pulsed laser are not well understood but seem to result at least partly from processes within the plasma, whereas nanosecond nitriding is based mainly on processes within the liquid/solid surface.

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“…and a hydrogen atom. The reaction in a methane matrix results in products of the interaction between primary radicals CH 92,93 Co-condensation of transition metal atoms with aromatic hydrocarbons at 77 ± 80 K often results in bisarene complexes of (formally) zero-valent metals. 94 For instance, co-condensation of lanthanide atoms and 1,3,5-tris-tert-butylbenzene produces thermally stable `sandwich' complexes of Nd, Tb, Dy, Ho, Er and Lu, as well as thermally unstable complexes of La, Pr, Sm, Eu, Tm and Yb.…”

Section: Reactions Of Metal Atoms and Small Clusters In Low-temperatu...mentioning

confidence: 99%

Low-temperature reactions in the chemistry of nanosystems

Шабатина¹,

Sergeev²

2003

Russ. Chem. Rev.

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Infinite densities are non-normalizable quasi-probability distributions that can describe the long-time properties of systems when ergodicity is broken and the equilibrium Boltzmann-Gibbs distribution fails. Their experimental observation has remained elusive so far. We here perform semiclassical Monte Carlo simulations of cold atoms in dissipative optical lattices with realistic parameters. We show that the momentum infinite density, as well as its scale invariance, should be observable in shallow potentials. We further evaluate the momentum autocorrelation function both in the stationary and nonstationary, aging regime.

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Mössbauer study of the reaction of laser-evaporated iron atoms with nitrogen molecules in low-temperature argon matrices

Cited by 14 publications

References 12 publications

A Combined Experimental and Theoretical Study of Iron Dinitrogen Complexes: Fe(N₂), Fe(NN)_x (x = 1−5), and Fe(NN)₃⁻

A Combined Experimental and Theoretical Study of Iron Dinitrogen Complexes: Fe(N₂), Fe(NN)_x (x = 1−5), and Fe(NN)₃⁻

Laser nitriding of iron with laser pulses from femtosecond to nanosecond pulse duration

Low-temperature reactions in the chemistry of nanosystems

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Mössbauer study of the reaction of laser-evaporated iron atoms with nitrogen molecules in low-temperature argon matrices

Cited by 14 publications

References 12 publications

A Combined Experimental and Theoretical Study of Iron Dinitrogen Complexes: Fe(N2), Fe(NN)x (x = 1−5), and Fe(NN)3−

A Combined Experimental and Theoretical Study of Iron Dinitrogen Complexes: Fe(N2), Fe(NN)x (x = 1−5), and Fe(NN)3−

Laser nitriding of iron with laser pulses from femtosecond to nanosecond pulse duration

Low-temperature reactions in the chemistry of nanosystems

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Product

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A Combined Experimental and Theoretical Study of Iron Dinitrogen Complexes: Fe(N₂), Fe(NN)_x (x = 1−5), and Fe(NN)₃⁻

A Combined Experimental and Theoretical Study of Iron Dinitrogen Complexes: Fe(N₂), Fe(NN)_x (x = 1−5), and Fe(NN)₃⁻