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  • 1
    Electronic Resource
    Electronic Resource
    Pulsed-ultraviolet-laser-induced chemiluminescence of NaCd and NaHg excimers (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 7017-7018 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: NaCd and NaHg excimers have been produced by pulsed uv laser irradiation of Na+Cd and Na+Hg vapor mixtures. Their characteristic bound-free emission in the blue region, previously observed in cw experiments, has been detected and its time behavior has been investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463212
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  • 2
    Electronic Resource
    Electronic Resource
    Near-field spectroscopy of porous silicon microcavity samples (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 5495-5497 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Near-field optical spectroscopy has been used to investigate photoluminescence features of porous silicon microcavity samples with a subwavelength space resolution. The emission is found to be markedly dependent on the lateral position, with the presence of relatively narrow spectral features peaked at different wavelengths in the range 610–690 nm. Furthermore, the spectrum obtained by summing up spectra taken at different sampling points (relative displacement ∼100 nm) recovers the standard (macroscopic) photoluminescence spectrum of porous silicon, except for the presence of a dip around the resonance wavelength of the microcavity resonator. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1459747
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  • 3
    Electronic Resource
    Electronic Resource
    Modular digital box-car for applications in pulsed laser spectroscopy (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3507-3512 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A digital box-car, designed to work with sources producing signals composed of single pulses or series of pulses, is described. Thanks to its modular design, the system can be employed as a single-photon counting or as a coincidence unit in many experimental situations. The box-car is based on a digitally controlled delay line, producing a delay in the interval 17 ns–327.692 μs by 5 ns steps, a fast gate with an opening time adjustable in the range 10 ns–20.0 μs, and an 8-bit binary counter operating at a maximum frequency of 250 MHz. It also employs two pulse amplifiers, accepting negative pulses with a duration larger than 2 ns and an amplitude in the range 30–500 mV, and a fan-out unit. Applications to fluorescence and ion detection in experiments involving pulsed laser sources are briefly discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145462
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  • 4
    Electronic Resource
    Electronic Resource
    Raman and infrared spectroscopy of ferroelectric Pb(Ti0.48Zr0.52)O3 films deposited by pulsed laser ablation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 6321-6323 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pb(Ti0.48Zr0.52)O3 films produced by pulsed laser ablation deposition have been locally examined for their homogeneity and thickness through a comparative use of Raman and infrared spectroscopy. Raman scattering intensity appears to be an oscillating function of the position of the point under measurements. The observed oscillations were explained by light interference effects in the film and used to obtain the thickness profile and the refractive index dispersion of the film. The intensity distribution in Raman spectra across the film differs from that of the target. This difference is larger at the center than near the edge of the film. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360512
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  • 5
    Electronic Resource
    Electronic Resource
    Diagnostics of YBa2Cu3O7−δ laser plume by time-of-flight mass spectrometry (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 8077-8087 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The time-of-flight mass spectrometry has been used to investigate the formation of charged species in the laser ablation of YBa2Cu3O7−δ (YBCO) target. Mass spectra were taken both in high vacuum and in oxygen environment for two values of the laser energy density (0.74 and 2.5 J cm−2). The analysis of the charged species in the plume has been carried out as a function of the distance between the target and the spectrometer axis and the relative abundance of Cu, Y, Ba, CuO, YO, and BaO ions has been measured and discussed. In this paper the formation of heavy species and YBCO clusters is also discussed. The plume range has been evaluated as a function of the absorbed energy at a distance from the target plane close to that one at which good quality high Tc superconducting films are obtained, the plume composition has been found to be characterized by the presence of a series of oxide clusters originating from the interaction between the ablated material and the environmental oxygen. This confirms that the interaction between the plume and the environmental oxygen plays an important role both in the formation of heavy charged species and in the capture of the oxygen required to obtain the correct stoichiometric composition of the deposited film. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357856
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  • 6
    Electronic Resource
    Electronic Resource
    Laser ablation of Pb(Ti0.48Zr0.52)O3 target: Characterization and evolution of charged species (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 494-504 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-of-flight mass spectrometry and covariance mapping technique were used to investigate the formation of charged species in the laser ablation of a Pb(Ti0.48Zr0.52)O3 target. Mass spectra were taken both in high vacuum and in an oxygen environment in order to clarify the effect of oxygen on the plume composition. The analysis of charged species in the plume has been carried out as a function of the distance between the target and spectrometer axis. The relative abundance of atomic, monoxide, and heavy ions has been measured and discussed. The velocities of atomic ions in the laser plume have been evaluated. Pb transport from target to substrate has been found to be mainly due to Pb-containing heavy species, whose abundance is greater in an oxygen environment with respect to a high vacuum condition. Ionic yield and covariance mapping analysis indicate that oxidation of ablated material starts at a distance very close to the plume range. The data show that, close to the deposition distance, a significant fraction of the plume is composed of heavy species containing Pb and oxides. These are appropriate precursors for the stoichiometric growth of ferroelectric films. The oxides are important carriers of oxygen atoms, and the Pb-containing heavy species preserve the metal stoichiometry with respect to Pb, which is the most volatile element in the composition. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360781
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  • 7
    Electronic Resource
    Electronic Resource
    In situ diagnostics of pulsed laser deposition of ferroelectric Pb(Ti0.48Zr0.52)O3 on Si (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 1194-1196 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transport of material from target to substrate has been monitored in the pulsed laser deposition of Pb(Ti0.48Zr0.52)O3 films on p-doped Si(100) using two in situ diagnostics, namely plume fluorescence spectroscopy and plume ion mass spectrometry. The as-grown PZT films are specular, with thicknesses which decrease from 350 to 250 nm on a radius 5 mm from the center and show a dielectric hysteresis with typical remanent polarizations and coercive fields of 0.2 μC/cm2 and 124 kV/cm, respectively. The analysis of the plume fluorescence emission and ionic yield indicates that oxidation of the ablated material occurs during transport from target to substrate and that, in order to grow ferroelectric thin films, the substrate should be located in the region of the plume where the relative concentrations of metal oxides and clusters increase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109768
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  • 8
    Electronic Resource
    Electronic Resource
    Mechanisms for O2 dissociation during pulsed-laser ablation and deposition (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 2402-2404 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate different dissociation mechanisms for O2 gas during pulsed-laser ablation and deposition. Mesaurements are carried out by using an in situ diagnostics based on absorption spectroscopy of oxygen gas, with space- and time-resolved capabilities, during laser ablation of a metal alloy target in the presence of an oxygen environment. Data, analyzed as a function of ablation parameters, indicate that two different mechanisms, involving electron collisions and formation of a high-density, high-temperature shock layer, play an important role in producing atomic oxygen which can subsequently react with the ablated species. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1366363
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  • 9
    Electronic Resource
    Electronic Resource
    Theoretical analysis of the emission spectra of the NaCd excimer (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 7782-7788 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present simulations of bound–bound and bound–free emissions of the NaCd* excimer, along with new experimental results concerning the red band system. The simulations, based on ab initio potential energy curves, confirm that the initial states are 2 2Σ+ for the red emission and 2 2Π for the blue emission of NaCd*. The two main peaks in the blue band system are due to spin–orbit splitting. The band shape obtained in the simulations is extremely variable, depending on the population distribution of the vibrational states of NaCd*. The comparison of simulated and measured spectra leads us to conclude that, in the experimental conditions adopted here and in previous work, the thermal equilibration of the excimer is far from complete. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469031
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  • 10
    Electronic Resource
    Electronic Resource
    Production of the electronically excited NaCd excimer via resonant excitation of the metastable Cd(5p 3P1) level (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 8103-8108 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the first evidence for the production of the electronically excited NaCd excimer following resonant excitation of the metastable Cd(5p 3P1) state. Dependence of intensity of emission from NaCd upon buffer gas pressure, temperature, and exciting laser wavelength is discussed and possible production mechanisms are proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466804
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