Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Measurement and prediction of Raman Q-branch line self-broadening coefficients for CO from 400 to 1500 K (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 4059-4068 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The J and temperature dependence of the self-broadening coefficients for the Raman Q-branch lines of pure CO have been experimentally determined for Q(J) transitions with J=0–38 and for temperatures in the range 400–1500 K. It is shown that a fitting law, based on a modified exponential energy-gap model for the rates of state-to-state rotationally inelastic collisions, can account for the observed J dependence. The two parameters that determine the J dependence are found to be essentially independent of temperature. A temperature scaling function, recently proposed for N2, is added to the basic rate law, and accurate predictions of both the J and the T dependence of these coefficients and those previously reported at 298 K are obtained. This rate law model, used in conjunction with a relaxation matrix description of the Q-branch spectrum, is shown to give good agreement with the observed, partially collapsed spectrum at 2.8 atm and 295 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455764
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Resonance electron scattering by oriented O2, N2, and CO and application to physisorption on graphite (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 8736-8747 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper, we explore the connections between resonance electron scattering by isolated and physisorbed molecules. The multiple scattering Xα method is used to calculate cross sections for electron scattering via the σ shape resonances of O2, N2, and CO, near 9, 22, and 20 eV, respectively. Special emphasis is placed on the O2 resonance, for which no previous theoretical work has been reported. In all three cases, quantitative agreement is obtained with experimental gas phase scattering results. Angular distributions are then calculated for the isolated, oriented molecules, and compared with the angular distributions recently observed in resonance scattering by O2, N2, and CO molecules oriented by physisorption on graphite. Characteristic nodes observed in each of the angular distributions are related to the calculated angular profiles, together with a previously proposed selection rule which we now formalize. This scheme allows the orientation of the molecules on the surface to be determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463972
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Resonant excitation of low frequency modes in electron scattering by physisorbed O2 on Pt(111) (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 7175-7178 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The lineshape of the v=0–1 vibrational mode in the high resolution electron energy loss spectrum of physisorbed O2 on Pt(111) shows discrete loss peaks attributed to a low frequency molecule-surface vibration and its overtones. The energy and angular dependence of these vibrations is consistent with the molecular negative ion resonance mechanism predicted by Gadzuk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466205
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Mechanisms of visible photoluminescence from nanoscale silicon cones (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 3294-3298 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We explore the origin of visible photoluminescence in nanoscale silicon cones fabricated by reactive ion etching in silicon-on-insulator substrates utilizing rough silver films as masks. Photoluminescence (PL) visible to the naked eye was observed after oxidation and annealing. Samples oxidized at 900 °C exhibit intense yellow/green photoluminescence centered at about 530 nm. Samples oxidized at 1000 °C luminesce in the red-to-infrared region with peak positions between 650 and 730 nm. Transmission electron microscopy characterization is employed to show that PL at 530 nm can be understood in terms of defect states, while the PL at 650–730 nm can be explained by a combination of defect state and quantum confinement effects. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1448394
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    A new high transmission infinite range mass selector for cluster and nanoparticle beams (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 4497-4501 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new mass selection technique has been developed, which allows one to size-select charged particles from atoms to nanoparticles of almost unlimited size. It provides a mass resolution of m/Δm=20–50 and a transmission of about 50% for the selected size, both independent of mass. The technique is based on the time-of-flight principle, but differs fundamentally from time-of-flight mass selection normally used. The basic idea is to use time-limited high voltage pulses to displace laterally a preaccelerated ion beam, without changing its direction or shape. As the movement of the ions perpendicular to their original beam direction is independent of their forward velocity, mass resolution and calibration does not depend on the ion beam energy. A mass selector of this type has been implemented successfully into a cluster deposition experiment and has proven to be reliable and simple to operate. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150102
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Compact ultrahigh vacuum sample exchange device with wide temperature range (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 313-314 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe the design and performance of a compact ultrahigh vacuum sample holder, which allows (1) sample transfer, (2) liquid-nitrogen cooling, (3) heating by electron bombardment, and (4) temperature measurement in direct proximity to the sample. The device operates from close to liquid-nitrogen temperatures up to temperatures of 800–900 K in the steady-state regime with peak temperatures in excess of 1700 K and allows easy and reliable sample transfer. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148526
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Gas condensation source for production and deposition of size-selected metal clusters (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 3327-3334 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe the construction and performance of a gas condensation cluster source. The source was designed for deposition of mass-selected metal clusters with controlled landing energy. We have produced clusters of Pbn (n=2–∼300) and Agn (n=∼20–∼300) with sufficient intensity to deposit size-selected clusters to a density of 1012 clusters/cm2 in 10 min. The landing energy of the clusters can be controlled from ∼25 to 800 eV. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148292
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Compact sputter source for deposition of small size-selected clusters (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 3335-3339 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We report on the development of a caesium ion sputter source for the production of small mass-selected atomic clusters. It has been designed to be compact and portable, enabling it to be attached to ultrahigh vacuum (UHV) systems for use in deposition experiments. The sputter source, developed from a high energy (∼20 keV) atomic ion beam source, has been modified by introducing a beam extraction section, resulting in a cluster beam energy of 1.5 kV. This allows mass selection to be performed with a compact Wien velocity filter, greatly reducing the dimensions of the source. The source produces sufficient intensities of small clusters (1 – 15 atoms/cluster) for UHV deposition experiments, for example, a deposition rate of 0.002 monolayers/min for Al7− focused onto a 1 cm2 area has been obtained. It is possible to produce beams of many materials, especially the noble metals and carbon. We show mass spectra for Agn −, Aln− , and Cn− clusters. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148293
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Diffusion controlled growth of metallic nanoclusters at selected surface sites (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2942-2947 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the growth of three-dimensional Ag particles at atomic steps on the surface of highly oriented pyrolytic graphite using a scanning electron microscope. By controlling the growth parameters the cluster growth was confined to the steps avoiding terrace nucleation. In this way quasi-one-dimensional chains of Ag nanoclusters of approximately 10 nm diam were produced. The results suggest the viability of an important new route to the creation of controlled nanoscale structures. A comprehensive surface study indicates that cluster mobility and coalescence play an important role in the growth mechanism on the steps. Evidence was also found that the graphite surface has several different types of surface steps. A quantitative analysis of the cluster distribution on the steps was performed, to investigate the nucleation and growth processes at temperatures from 50 to 205 °C. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361290
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    "Concerted'' regeneration of electroformed metal-insulator-metal devices (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 8565-8570 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Filament regeneration has been investigated in electroformed Cu-SiOx-Cu sandwich devices at cryogenic temperatures (≈125 K). The initial regeneration characteristics can be modeled by proposing a new scheme, which we term "concerted regeneration.'' This is the preferential regeneration of filaments located close to intact filaments (which generate a local increase in temperature via power dissipation). This coordination in the regeneration of filaments can also cause "explosive regeneration,'' the rapid regeneration of a batch of filaments, and thus a sudden jump in the device current, and also "concerted rupture,'' a sudden drop in conductivity due to a batch of filaments rupturing simultaneously. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362537
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...