UV photo-dissociation and photodesorption of N<sub>2</sub>O on Ag(111)

Kim, Ki‐Hyun; Watanabe, Kazuo; Menzel, D.; Freund, Hans‐Joachim

doi:10.1088/0953-8984/22/8/084012

Cited by 10 publications

(11 citation statements)

References 36 publications

(69 reference statements)

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“…(2004). Apps et al (2004) propose an interpretation with more displacement in the basement than the one from Ford et al (1999). Célini et al (2020).…”

Section: Discussionmentioning

confidence: 90%

“…In the Southwestern French Alps, the collision led to the birth of two major thrust systems, including: the Eocene Embrunais-Ubaye thrust sheets which translated the distal part of the system (e.g. Kerckhove, 1969), and the Digne Nappe system, active from the Oligocene to the Pliocene (Apps et al 2004;Ford et al 2006), which affected the proximal part and forms the thrust front of this part of the Alps.…”

Section: Southwestern French Alps Frameworkmentioning

confidence: 99%

“…At that time, the emphasis in structural geology was on fold and thrust tectonics in places like the Southwestern French Alps and Pyrenees (Saura et al 2015). Salt in the southern Subalpine Chains was considered for decades only as an efficient décollement level for thrusts (Faucher et al 1988;Fry 1989;Lickorish and Ford 1998;Apps et al 2004;Ford et al 2006), following the new wave of thrust tectonics coming from the US rockies and developing cross-section balancing techniques (Dahlstrom, 1969;Elliott, 1976;Boyer & Elliott, 1982;Davis et al, 1983;Mitra & Boyer, 1986, nonexhaustive list). We see now that this is only applicable where the salt is not involved in early pre-thrusting salt tectonics which can influence the later compression as in the Jura fold-andthrust belt (Philippe et al 1998;Sommaruga 1999).…”

Section: Old Rocks But Recent and Evolving Ideasmentioning

confidence: 99%

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Anatomy and evolution of the Astoin diapiric complex, sub-Alpine fold-and-thrust belt (France)

Célini¹,

Callot²,

Ringenbach³

et al. 2021

BSGF - Earth Sci. Bull.

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The structure of the southwestern branch of the Alpine orogen is affected by the extensive Late Triassic evaporites. These evaporites have been involved in polyphased salt tectonics since the early Liassic, coeval with the Tethyan rifting, and are the décollement level for thrusts in the external parts during Alpine orogeny. The role of salt tectonics in this branch of the Alpine arc is re-evaluated in order to determine the relative importance of early deformation related to salt motion with respect to deformation related to main Alpine compressional events. This paper focuses on one structure identified as diapiric since the 1930’s: the Astoin diapir (Goguel 1939). Analysis of geological maps together with new field work have allowed to better define diapirism in the Upper Triassic evaporites outcrops around Astoin. Study of the diapir and the surrounding depocenters reveals a major involvement of salt in the structuration of the area, since the Liassic. Several salt ridges are linked to a main diapiric structure, explaining why we call it the “diapiric complex” of Astoin. Salt tectonics was initiated during the Liassic rifting, and a few locations show evidence of reactive diapirism whereas in others evidence of passive diapirism as early as the Liassic is seen. Passive diapirism continued during the post-rift stage of Alpine margin history in the Late Jurassic and Cretaceous when an allochthonous salt sheet was emplaced. Diapirism also occurred during the Oligocene while the Alpine foreland basin was developing in this part of the European margin of the Alps. Serial interpretative cross-sections have been drawn in order to illustrate the lateral variations of diapirism and structural style. Sequential evolutions for each cross-section are proposed to reconstruct the diapiric complex evolution through time. The Astoin diapir shows a complex structural framework with an important along-strike variation of diapiric activity. Most of the geometries are inherited from salt tectonics that occurred during extension, and in some places these early structures are overprinted by Alpine compressional structures.

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“…(2004). Apps et al (2004) propose an interpretation with more displacement in the basement than the one from Ford et al (1999). Célini et al (2020).…”

Section: Discussionmentioning

confidence: 90%

Section: Southwestern French Alps Frameworkmentioning

confidence: 99%

Section: Old Rocks But Recent and Evolving Ideasmentioning

confidence: 99%

See 1 more Smart Citation

Anatomy and evolution of the Astoin diapiric complex, sub-Alpine fold-and-thrust belt (France)

Célini¹,

Callot²,

Ringenbach³

et al. 2021

BSGF - Earth Sci. Bull.

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“…Interestingly, pure N 2 O on Ag(111) has been shown to be quite photoreactive, with complicated characteristics. 55 This shows the importance of the interaction between N 2 O and O(ad).…”

Section: Other Photochemical Reaction Channels Of (No) 2 On Ag Npsmentioning

confidence: 91%

Case studies in surface photochemistry on metal nanoparticles

Menzel

Kim

Mulugeta

et al. 2013

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The authors give a survey of their work on photochemical processes at silver nanoparticles carried out in Berlin in the past decade. Using well established procedures for the preparation of silver nanoparticles (Ag NPs) supported on ultrathin alumina layers on NiAl single crystals, they have investigated the photoreactions of adsorbed (NO) 2 and of Xe induced by laser pulses. The authors examined the influences of photon energy (2.3, 3.5, and 4.7 eV) and polarization, mean particle size (2-10 nm), and pulse length (5 ns and 100 fs) on yields and cross sections, and on photoreaction mechanisms. Comparison with Ag(111) was made throughout. For the NO dimer layer, the authors find general agreement with known results on bulk Ag(111) in terms of possible reactions (NO desorption and NO monomer formation as well as conversion into adsorbed N 2 O and O) and predominant mechanism (via transient negative ion formation, TNI); NO desorption is the strongest channel. However, on the NPs, the cross sections show selective enhancement in particular under conditions of excitation of the Mie plasmon due to the field enhancement caused by it, but-more weakly-also under off-resonant conditions which the authors interpret by excitation confinement in the NPs. For ns laser pulses, the desorption yield responds linearly to photon flux so that the cross sections are independent of laser fluence. Using fs laser pulses, nonlinear yield response is found under plasmon excitation which is interpreted as due to re-excitation of hot electrons in the NPs during a single laser pulse. The dynamics of the individual process, however, stay the same under almost all conditions, as indicated by constant energy distributions over translational, rotational, and vibrational energies of the desorbing NO molecules, even in the nonlinear range. Only for the highest photon energy (i.e., off-resonance) and the smallest particles, a new channel is observed with higher translational energy which is believed to proceed via transient positive ions. The branching into the various reaction channels is found to be different on Ag NPs from that on Ag(111) which is ascribed to differing enhancements for the various channels. While these results show that for a typical molecular reaction only the yields are modified on NPs, very different behavior is observed for desorption of adsorbed Xe. Here, low intensity excitation of the Mie plasmon leads to chaotic response which must be due to hot spot formation. As in this case no simple desorption mechanism (via transient negative or positive ions, or direct HOMO-LUMO excitation of the adsorbate) is expected, a direct action of the plasmon excitation is postulated. Some general conclusions are drawn from these case studies. V

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“…of the N 2 O molecule is smaller ($1.6 eV). [4][5][6] For example, an electron impact collision is typically expected to result in the dissociation of the background molecules, as: e À þ O 2 ! O þ O þ e À , and e À þ N 2 O !…”

Section: Introductionmentioning

confidence: 99%

Plasma interactions with the N2O background gas: Enhancing the oxidization of alkaline-earth species for pulsed laser deposition

Chen

Döbeli

Wokaun

et al. 2018

Journal of Applied Physics

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Using N 2 O as an alternative background gas to O 2 when growing oxide thin films by pulsed laser deposition (PLD) was previously expected to result in larger oxygen contents of as-grown thin films. In this work, we investigate the composition and kinetic energy of the pulsed laser induced plasmas that propagated in N 2 O and O 2 by using mass spectrometry and plasma imaging. Two distinguished features were observed when using N 2 O instead of O 2 . (1) In N 2 O background gas as compared to O 2 , a larger proportion of negative oxygen ions was detected.(2) The alkaline-earth elements were fully oxidized in the N 2 O background, which is not achievable in O 2 . These observations are attributed to the smaller dissociation energy of the N 2 O molecules as compared to O 2 . The smaller dissociation energy of the background gas molecule is expected to reduce the interaction strength during their central collisions with the plasma species. As a result, the dissociable or electron detachable plasma species can be formed in larger amounts in N 2 O background, compared to O 2 . Comparing the composition of the deposited thin films indicates a larger oxygen content of the film grown in N 2 O background gas, as compared to O 2 , at pressures of $10 À1 mbar, which is the most commonly used deposition pressure in PLD. Nevertheless, this was not achieved when performing PLD at $10 À2 mbar, since the pressure was not high enough to trigger the formation of the shockwave front during the plasma expansion and thereby the lightest oxygen plasma species were preferentially scattered. Published by AIP Publishing. https://doi. JOURNAL OF APPLIED PHYSICS 124, 085308 (2018) 085308-2 Chen et al. J. Appl. Phys. 124, 085308 (2018) FIG. 2. Oxidization of metallic positive ions indicated by MO þ /(M þ þ MO þ ) for (a) La and Mn and (b) Sr as a function of the N 2 O and O 2 background pressures. (c) Time resolved plasma imaging of SrI (496.23 nm) and SrO (439.96 nm) in vacuum as well as 1 mbar background pressure of O 2 ,N 2 O, and Ar. 085308-3Chen et al.

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UV photo-dissociation and photodesorption of N₂O on Ag(111)

Cited by 10 publications

References 36 publications

Anatomy and evolution of the Astoin diapiric complex, sub-Alpine fold-and-thrust belt (France)

Anatomy and evolution of the Astoin diapiric complex, sub-Alpine fold-and-thrust belt (France)

Case studies in surface photochemistry on metal nanoparticles

Plasma interactions with the N2O background gas: Enhancing the oxidization of alkaline-earth species for pulsed laser deposition

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UV photo-dissociation and photodesorption of N2O on Ag(111)

Cited by 10 publications

References 36 publications

Anatomy and evolution of the Astoin diapiric complex, sub-Alpine fold-and-thrust belt (France)

Anatomy and evolution of the Astoin diapiric complex, sub-Alpine fold-and-thrust belt (France)

Case studies in surface photochemistry on metal nanoparticles

Plasma interactions with the N2O background gas: Enhancing the oxidization of alkaline-earth species for pulsed laser deposition

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UV photo-dissociation and photodesorption of N₂O on Ag(111)