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  • 1
    Electronic Resource
    Electronic Resource
    Plasma breakdown behavior of hydrogen azide (HN3) gas mixtures (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 6195-6197 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Plasma breakdown studies in HN3 and its mixtures with inert gases showed Paschen type behavior independent of electrode geometries. For pressures above 3.3 Torr and with nonsharp electrodes, a breakdown induced detonation always produced a complete volumetric decomposition verified by mass spectrometric analysis and doubling of the initial pressure. NH(A3Π→X3∑−) spectra at 3360 (0,0) and 3371 A(ring) (1,1) were observed with an NH(A) yield of 0.002% relative to the initial HN3 concentration. Examination of the transient spectra suggested the HN3 volumetric decomposition was promoted by heating at the compression wave shock front.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350431
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  • 2
    Electronic Resource
    Electronic Resource
    Electrode effects in ultraviolet preionized breakdown of HN3 versus microwave excitation (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 7975-7977 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Distinct differences in the emission spectra from the breakdown of HN3 are observed for transverse excitation of HN3 gas mixtures by ultraviolet (UV) preionization relative to pulsed microwave discharges. In the dc UV preionized discharges, electrode effects liberate metal atoms dominating the emission spectra while the NH(A-X) band emission is absent. Pulsed microwave excitation incorporating an electrodeless quartz discharge region produces the NH(A-X) emission but reduced by significant quenching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353908
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  • 3
    Electronic Resource
    Electronic Resource
    BCl3/HN3 gas breakdown behavior: Observation of BCl(A-X) emission (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 4718-4720 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: BCl(A-X) band emission peaked at 272 nm plus N2(C-B) spectra from dc breakdown initiated detonations in HN3/BCl3 gas mixtures are reported. Negligible NH(A-X) emission at 336.0/337.1 nm is observed in contrast to its strong intensity in pure HN3 breakdown-induced decomposition. The presence of the HN3 detonation appears to enhance the production of BCl(A-X) emission indicating the liberation of chemical energy from the HN3 decomposition to excited BCl but at low effective yields of 8×10−4%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352745
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  • 4
    Electronic Resource
    Electronic Resource
    Electron beam initiated discharges in HN3 gas mixtures (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 394-400 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The behavior of electron beam initiated discharges in HN3 and inert gas mixtures for different E/N values are presented. These results are the first reported investigations of this highly energetic azide gas under plasma conditions. Using a 3 ns, 600 KeV ionizing electron beam, the temporal decay of the discharge current shows HN3 is electronegative. HN3 attachment rate constants in Ar are 5.0–10.0×10−11 cm3 s−1 for E/N values in the range 1–4 Td (10−17 V cm2). With the other inert gases (He, Ne, Kr, and Xe), HN3 attachment rate constants are 0.5–4.5×10−10 cm3 s−1 for the E/N range of 0.5–7.0 Td. Plasma excitation of Ar and HN3 gas mixtures produce intense N2(C→B, v'=0→v‘=0) electronic transition radiation at 3371 A(ring).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458441
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  • 5
    Electronic Resource
    Electronic Resource
    Infrared (0.9–1.65 μm) emission from thallium iodide photoexcited with ultraviolet excimer laser radiation (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 1840-1847 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The infrared emission spectra from 0.9 to 1.65 μm produced when thallium iodide vapor is photodissociated by excimer laser wavelengths of 193, 248, 308, and 351 nm are reported. In this spectral region, only atomic thallium transitions were observed. No emission from metastable atomic iodine at 1.315 μm (5 2P1/2→5 2P3/2) or thallium at 1.283 μm (6 2P3/2→6 2P1/2) was ever detected in contrast to strong 1.315 μm signals obtained by ultraviolet (UV) excimer laser dissociation of C3F7I. The failure to detect metastable atomic emission from TlI photodissociation is explained by the fast quenching of the metastable states during superelastic collision with electrons produced by photoionization of the TlI. Consequently, a pulsed iodine 1.315 μm laser based on photodissociation of thallium iodide does not seem practical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462085
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  • 6
    Electronic Resource
    Electronic Resource
    High UV (λ≥2200 A(ring)), visible, and near infrared (λ≤0.8 μm) transmissive liquid coolant for high power microwave (2.45 GHz) plasma tubes (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 381-391 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Commercially available dimethyl polysiloxane is shown to be an excellent liquid coolant for the containing walls of high power plasmas (≥300 W/cm3) excited with 2.45-GHz microwaves. This stable, nontoxic, and nonflammable fluid has very low microwave absorption (tan δ=ε‘/ε'=3.5×10−4) at this frequency. Fortuitously, it also has excellent ultraviolet, visible, and near infrared (λ≤0.8 μm) transmission. The UV transmission over 1 cm shows 2% transmission at 2000 A(ring), a 30% transmission at 2200 A(ring), 80% at 2400 A(ring), and 100% for λ(approximately-greater-than)2500 A(ring). These features plus its good physical (viscosity, thermal conductivity, specific heat capacity, heat of vaporization, and density) and electrical (resistivity and breakdown) properties make it very unique as a liquid coolant of UV emitting microwave plasma lamps. The clear coolant's infrared absorption for λ≥1.0 μm reduces the radiative (heat) emission from the plasma. In addition, dimethyl polysiloxane has a very wide operating temperature range, −73 °C≤T≤260 °C. Particular procedures required to assure its excellent ultraviolet transmission are described along with different geometrical combinations of liquid cooled plasma lamps and reflector housings. This liquid may also be used to cool microwave excited laser tubes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142132
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  • 7
    Electronic Resource
    Electronic Resource
    Hydraulic fluid as a liquid coolant of high power, cw microwave (2.45 GHz) plasma tubes (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 542-543 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Commercially available hydraulic fluid is shown to be an excellent liquid coolant for high power plasma tubes excited in microwave (2.45 GHz) structures such as resonant cavities, "holes'' in waveguides, and slotted waveguides. The hydraulic fluid's very low absorption (tan δ=ε‘/ε'=1.87×10−4) at 2.45 GHz makes this liquid useful as a safe and inexpensive coolant of high power, cw microwave plasma tubes. For the spectral region 5700 A(ring)≤λ≤1.1μm, the liquid's transmission is nearly 100% but greatly reduced for longer wavelengths and non-existent for λ≤5700 A(ring). Its nonflammable and nontoxic properties plus good viscosity are additional attractive features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142104
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  • 8
    Electronic Resource
    Electronic Resource
    Transverse flow cw atomic iodine laser at 1.315 μm (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 5664-5667 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A transverse flow cw atomic iodine laser at 1.315 μm excited by the photolytic pumping of C3F7I and demonstrating virtually an unlimited operating time is reported. The use of transverse flow establishes a much more constant integrated gain along the optical axis than that previously reported for the longitudinal flowing cw atomic iodine laser. Consequently, a cw atomic iodine laser is achieved having a greatly improved amplitude stability and easier operation in only the fundamental TEM00 transverse mode. Such an operation makes this type of cw atomic iodine lasr much more useful as a diagnostic probe laser at 1.315 μm than the previously reported longitudinal device.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340299
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  • 9
    Electronic Resource
    Electronic Resource
    Scaled-up production of n-C3F7I photolytic laser "fuel'' (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 2386-2389 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A tenfold mass production scale-up that provides an economical synthesis method for producing normal-heptafluoropropyl iodide (n-C3F7I) laser "fuel'' sustaining stable and reliable cw atomic iodine lasing at 1.315 μ via UV photolysis is reported. Such results strongly indicate that high purity n-C3F7I is being synthesized. Over 1 kg per day production of this n-C3F7I is demonstrated. The synthesis procedure involves three steps: formation of the n-C3F7COONa salt, refluxing at 45 °C, and a packed column distillation. During the synthesis, particular attention is given to minimizing those impurities producing detrimental effects on atomic iodine lasers. Yields of 65%–75% for n-C3F7I laser "fuel'' are achieved whenever liquid nitrogen is used to collect the synthesized product.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139914
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  • 10
    Electronic Resource
    Electronic Resource
    Ultrafast carrier dynamics in GaSb (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 82-84 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ultrafast carrier dynamics in GaSb are studied using optical transmission-correlation spectroscopy with sub-100-fs pulses. The laser wavelength was tuned between 1.50 and 1.72 μm in order to differentiate between different scattering processes. The carriers scatter out of the initial distribution in 2–2.5 ps with a 200–350 fs component also observed. This faster component, usually attributed to phonon scattering, is observed below the assumed phonon emission threshold. When the laser is tuned above the intervalley scattering threshold a large fraction of the carriers rapidly scatter to the L valley. Saturation of the absorption is measured versus the pump power near the band edge. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114153
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