Vacuum Ultraviolet Photochemistry

McNesby, J. R.; Okabe, H.

doi:10.1002/9780470133330.ch3

Cited by 166 publications

(8 citation statements)

References 136 publications

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“…Lacking an unsaturated bond, methane only absorbs light shorter than 145 nm; therefore, the photochemistry of methane mostly occurs in the stratosphere with a significant flux of Lymana photons at 121.6 nm (10.2 eV). Early laboratory works by McNesby et al, 32 Laufer et al, 33 Gorden et al, 34 Rebbert et al, 35 and Slanger et al 36 suggested quantum yields (denoted f) for methane photolysis at 121.6 nm as defined by eqn (1)-( 4). Secondary processes were inferred to produce the methylidyne radical via reactions Fig.…”

Section: Introductionmentioning

confidence: 99%

Untangling the chemical evolution of Titan's atmosphere and surface–from homogeneous to heterogeneous chemistry

et al. 2010

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Section: Introductionmentioning

confidence: 99%

Untangling the chemical evolution of Titan's atmosphere and surface–from homogeneous to heterogeneous chemistry

et al. 2010

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“…High-energy plasmonic nanostructures resonant in the ultraviolet (UV) to vacuum ultraviolet (VUV) region of the spectrum offer routes to channel high-energy radiation into nanoscale volumes thus supporting enhancement of high-energy photochemical reaction pathways at targeted nanoscale locations. Plasmonic nanoparticles resonant at visible and near-infrared frequencies have been used to direct electromagnetic radiation into subwavelength volumes known as “hot spots”, lending these nanoparticles to applications in nanoengineered devices for spectroscopy, − catalysis, , photodetectors, , sensors, − optoelectronics, , nano-optics, − photocathodes − and energy harvesting. , Consequently, high-energy plasmonic nanoparticles may provide a route to extend the spectral range of these applications into the VUV, an energy range where simple gas-phase molecules such as CO, O 2 , and H 2 O have electronic absorption bands , and work functions in solids can be overcome producing reactive photoelectrons.…”

mentioning

confidence: 99%

High-Energy Surface and Volume Plasmons in Nanopatterned Sub-10 nm Aluminum Nanostructures

et al. 2016

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In this work, we use electron energy-loss spectroscopy to map the complete plasmonic spectrum of aluminum nanodisks with diameters ranging from 3 nm to 120 nm fabricated by highresolution electron-beam lithography. Our nanopatterning approach allows us to produce localized surface plasmon resonances across a wide spectral range spanning 2-8 eV.Electromagnetic simulations using the finite element method support the existence of dipolar, quadrupolar and hexapolar surface plasmon modes as well as centrosymmetric breathing modes depending on the location of the electron-beam excitation. In addition, we have developed an approach using nanolithography that is capable of meV control over the energy and attosecond control over the lifetime of volume plasmons in these nanodisks. The precise measurement of volume plasmon lifetime may also provide an opportunity to probe and control the DC electrical conductivity of highly confined metallic nanostructures. Lastly, we show the strong influence of the nanodisk boundary in determining both the energy and lifetime of surface plasmons and volume plasmons locally across individual aluminum nanodisks, and we have compared these observations to similar effects produced by scaling the nanodisk diameter.High-energy plasmonic nanostructures resonant in the ultraviolet (UV) to vacuum ultraviolet (VUV) region of the spectrum offer routes to channel high-energy radiation into nanoscale volumes thus supporting enhancement of high-energy photochemical reaction pathways at targeted nanoscale locations. Plasmonic nanoparticles resonant at visible and near-infrared frequencies have been used to direct electromagnetic radiation into sub-wavelength volumes known as 'hot spots', lending these nanoparticles to applications in nanoengineered devices for spectroscopy, 1-4 catalysis, 5,6 photodetectors, 7,8 sensors, 9-11 optoelectronics, 12,13 nano-optics, [14][15][16] photocathodes 17-19 and energy harvesting. 20,21 Consequently, high-energy plasmonic nanoparticles may provide a route to extend the spectral range of these applications into the VUV, an energy range where simple gas-phase molecules such as CO, O 2 and H 2 O have electronic absorption bands 22,23 and work functions in solids can be overcome producing reactive photoelectrons.Plasmons in materials take one of two forms: (1) volume plasmons (VPs), which are high-energy longitudinal oscillations of conduction and valence band electrons that propagate through the bulk of a material; and (2) interface plasmons, which are collective oscillations of free electrons at an interface. When an interface plasmon occurs at the surface of a material it is referred to as a surface plasmon (SP). SPs can adopt multiple forms, those being surface plasmon polaritons (SPPs), which are propagating SPs that exist at the interface between a metal and a dielectric, and localized surface plasmon resonances (LSPRs) that exist on sub-wavelength metallic nanoparticles.Controlled engineering of LSPRs and VPs with energies greater than 5 eV has been limited to dat...

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“…On the other hand, the new IR bands at 1300 cm −1 and 3006 cm −1 reveal the production of methane. The release of CH 2 and CH 3 from the photolysis of C 11 H 24 promotes the interaction of these with H 2 and H (both released from the photolysis of undecane and from the H 2 in the chamber) to form CH 4 , a process that is well-known for the photolysis of alkanes 75 . More interestingly, as the UV irradiation proceeds, a new infrared band appears at 1645 cm −1 , which is assigned to the C=C stretching mode of alkenes 74 , proving the formation of unsaturated hydrocarbons.…”

Section: B Uv Photochemistry Of C11h24mentioning

confidence: 99%

INFRA-ICE: An ultra-high vacuum experimental station for laboratory astrochemistry

Santoro

Sobrado

Tajuelo-Castilla

et al. 2020

Review of Scientific Instruments

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Laboratory astrochemistry aims at simulating in the laboratory some of the chemical and physical processes that operate in different regions of the Universe. Amongst the diverse astrochemical problems that can be addressed in the laboratory, the evolution of cosmic dust grains in the different regions of the interstellar medium (ISM) and its role in the formation of new chemical species through catalytic processes present significant interest. In particular, in the dark clouds of the ISM dust grains are coated by icy mantles and it is thought that the ice-dust interaction plays a crucial role in the development of the chemical complexity observed in space. Here, we present a new ultra-high vacuum experimental station devoted to simulate the complex conditions of the coldest regions of the ISM. The INFRA-ICE machine can be operated as a standing alone setup or incorporated in a larger experimental station called Stardust, which is dedicated to simulate the formation of cosmic dust in evolved stars. As such, INFRA-ICE expands the capabilities of Stardust allowing the simulation of the complete journey of cosmic dust in space, from its formation in asymptotic giant branch stars (AGBs) to its processing and interaction with icy mantles in molecular clouds. To demonstrate some of the capabilities of INFRA-ICE, we present selected results on the UV photochemistry of undecane (C 11 H 24) at 14 K. Aliphatics are part of the carbonaceous cosmic dust and, recently, aliphatics and short n-alkanes have been detected in-situ in the comet 67P/Churyumov-Gerasimenko.

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Vacuum Ultraviolet Photochemistry

Cited by 166 publications

References 136 publications

Untangling the chemical evolution of Titan's atmosphere and surface–from homogeneous to heterogeneous chemistry

Untangling the chemical evolution of Titan's atmosphere and surface–from homogeneous to heterogeneous chemistry

High-Energy Surface and Volume Plasmons in Nanopatterned Sub-10 nm Aluminum Nanostructures

INFRA-ICE: An ultra-high vacuum experimental station for laboratory astrochemistry

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