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  • 1
    Electronic Resource
    Electronic Resource
    Laser pointing stability measured by an oblique-incidence optical transmittance difference technique (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 3714-3717 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe an oblique-incidence optical transmittance technique for determining the pointing stability of a laser. In this technique, we follow the angular drift of a monochromatic laser beam by measuring the relative changes in transmittance through a parallel fused quartz window for s and p polarized components of the beam in response to the drift. This method is shown in the present experiment to have the sensitivity to detect angular changes in the range of 2 μ radians (1 μ radian=10−6 radian). To demonstrate this technique, we measured the angular drifts of two commercial intensity-stabilized He–Ne lasers. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1394187
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  • 2
    Electronic Resource
    Electronic Resource
    Oxidation kinetics in SrTiO3 homoepitaxy on SrTiO3(001) (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 460-462 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using an oblique-incidence optical reflectivity difference technique, we investigated kinetic processes in SrTiO3 homoepitaxy on SrTiO3(001) under pulsed-laser deposition conditions. Depending upon growth temperature and oxygen ambient pressure, we found that the oxidation of an as-grown SrTiO3 monolayer may take a much longer time to complete than the recrystallization of the monolayer. The oxidation reaction was found to be characterized by an effective activation energy barrier of 1.35 eV and a large preexponential factor. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1338497
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  • 3
    Electronic Resource
    Electronic Resource
    In situ monitoring of ion sputtering and thermal annealing of crystalline surfaces using an oblique-incidence optical reflectance difference method (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 2736-2738 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate that the morphology of crystalline surfaces during ion sputtering and thermal annealing can be monitored in situ with an oblique-incidence polarization-modulated optical reflectance difference technique. Such a technique is effective under high ambient pressures as well as ultrahigh vacuum. We studied the Ne ion sputtering and thermal annealing of Ni(111) from 623 to 823 K. We found that the rate-limiting step (with an activation energy of 1.1 eV/atom) during annealing is most likely to be direct evaporation of Ni atoms from step edges. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122574
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  • 4
    Electronic Resource
    Electronic Resource
    Oxidation kinetics in La0.67Ba0.33MnO3−δ epitaxy on SrTiO3 (001) during pulsed-laser deposition (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 3540-3542 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using an oblique-incidence optical reflectance difference technique, we study the kinetics of La0.67Ba0.33MnO3−δ (LBMO) epitaxy on SrTiO3(001) during pulsed-laser deposition. By monitoring the recovery of the optical response function from one-monolayer-deposited LBMO, we found that under the conditions studied, the epitaxy was rate limited by the oxidation of the as-deposited monolayer with an activation barrier of 1 eV/atom or 23 kcal/mol. The result reveals the origin of oxygen deficiency often found in manganite thin films. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124154
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  • 5
    Electronic Resource
    Electronic Resource
    Fabrication of nano-structural arrays by channeling pulsed atomic beams through pulsed-laser standing-waves under off-resonant condition (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 525-527 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We show that it is feasible to produce one- and two-dimensional nano-structure arrays by passing microsecond pulsed atomic beams through microsecond laser standing-wave patterns under completely off-resonant condition. This method enables fabrication of vertically heterogeneous nanostructures such as multilayers with one pulsed laser system. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123175
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  • 6
    Electronic Resource
    Electronic Resource
    Broadly tunable picosecond pulses generated in a β-BaB2O4 optical parametric amplifier pumped by 0.532 μm pulses (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1490-1492 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the generation of a highly intense, tunable source from 0.67 μm to 2.58 μm by optical parametric generation and amplification in β-barium borate (BBO) pumped by picosecond pulses at 0.532 μm. The maximum conversion efficiency from the pump to the signal is 13%. The output energy is in the range a few hundred μJ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107525
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  • 7
    Electronic Resource
    Electronic Resource
    Vibrational and electronic spectroscopy of pyridine and benzene adsorbed on the Rh(111) crystal surface (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 441-450 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the vibrational and electronic spectra for pyridine and benzene adsorbed on the Rh(111) crystal surface obtained by high-resolution electron energy loss spectroscopy (HREELS). Low-energy electron diffraction (LEED), thermal desorption spectroscopy (TDS), and optical second harmonic generation (SHG) have also been used to provide complementary information. Pyridine adsorption on Rh(111) was studied over the 77–450 K temperature range. At 77 K, multilayers of pyridine are observed with a vibrational spectrum similar to that of liquid pyridine. Between 185 and 230 K, HREELS and TDS indicate that both physisorbed and chemisorbed pyridine species are present on the surface. The physisorbed species desorbs at 295 K, while the chemisorbed species is stable until it decomposes on the surface at 400 K. We propose that the chemisorbed species is an α-pyridyl complex as thermal desorption spectroscopy indicates partial dehydrogenation of this pyridine surface species. Electronic energy loss spectra for both benzene and pyridine adsorbed at 310 K show only a weak transition centered at ∼4 eV. The absence of prominent π→π* transitions, which are readily observed for multilayers of benzene adsorbed on Rh(111), implies that the π orbitals are strongly involved in the chemisorption bond of these molecules with the Rh(111) surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454622
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  • 8
    Electronic Resource
    Electronic Resource
    An optical differential reflectance study of adsorption and desorption of xenon and deuterium on Ni(111) (1996)
    Springer
    Applied physics 63 (1996), S. 1-8 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 78.66; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  We studied adsorption and desorption of Xe and deuterium on Ni(111) using an optical differential reflectance technique. The main findings are: (i) the differential reflectance varies almost linearly with the surface densities of deuterium and Xe adatoms, and the signals can be described well with a three-layer model and the known dielectric responses of the surface layers: (ii) the adsorption of deuterium at T=120 K follows the Langmuir kinetics, while the adsorption of Xe at T=38 K follows the zeroth-order kinetics; (iii) near T=70 K, the rate of Xe desorption is almost coverage-independent with an activation energy of E des=4.4±0.2 kcal/mol. Our analysis suggests that the Xe desorption is likely to be dominated by the escape rate from the corners of two-dimensional Xe islands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050345
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  • 9
    Electronic Resource
    Electronic Resource
    An optical differential reflectance study of adsorption and desorption of xenon and deuterium on Ni(111) (1996)
    Springer
    Applied physics 63 (1996), S. 1-8 
    Details
    ISSN: 1432-0630
    Keywords: 78.66 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We studied adsorption and desorption of Xe and deuterium on Ni(111) using an optical differential reflectance technique. The main findings are: (i) the differential reflectance varies almost linearly with the surface densities of deuterium and Xe adatoms, and the signals can be described well with a three-layer model and the known dielectric responses of the surface layers: (ii) the adsorption of deuterium atT = 120 K follows the Langmuir kinetics, while the adsorption of Xe atT = 38 K follows the zeroth-order kinetics; (iii) nearT = 70 K, the rate of Xe desorption is almost coverage-independent with an activation energy ofE des = 4.4 ± 0.2 kcal/mol. Our analysis suggests that the Xe desorption is likely to be dominated by the escape rate from the corners of two-dimensional Xe islands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01579739
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  • 10
    Electronic Resource
    Electronic Resource
    Detection of monolayer gratings of adsorbates by linear optical diffractions (1991)
    Springer
    Applied physics 52 (1991), S. 317-322 
    Details
    ISSN: 1432-0630
    Keywords: 78.65. -s ; 07.60. Hv ; 68.35. Fx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We report the detection of linear optical diffraction of a He-Ne laser probe beam from a monolayer grating of molecular adsorbates up to the fifth order with no electronic or electromagnetic enhancement. The advantages of using linear diffraction to probe surface diffusion of adsorbates are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324772
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