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  • 1
    Electronic Resource
    Electronic Resource
    Highly predissociative levels of the D 2Π state of CH studied with the two-color resonant four-wave mixing technique (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 4942-4947 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We investigated highly predissociative transitions D 2Π–B 2Σ−(0-0) of CH in an oxyacetylene flame with two-color resonant four-wave mixing, in which two grating beams are in resonance with the D–B transition and the pump (and signal) beam is resonant with a selected B–X transition. A total of 86 predissociative lines in six branches are observed, corresponding to excitation of the D state up to N′=16; in previous experiments lines up to only N′=6 were observed. Observed rovibronic transitions of the D–B(0-0) band are fitted to known Hamiltonians to yield improved spectral parameters of the D 2Π (v=0) state. The parameters for centrifugal distortion (D,H) and Λ doubling (p,q,qD) of the D 2Π (v=0) state are deduced for the first time. The predissociative line width is about 2 cm−1 for the rotational level with N′=1 and it gradually increases with N′; for N′=15 the width is about 7 cm−1. Predissociation mechanisms of the D 2Π state are discussed. A barrier height ∼5600 cm−1 for the D state is estimated based on observed predissociative lifetimes. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479753
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  • 2
    Electronic Resource
    Electronic Resource
    Electronic spectra of ND3 in the region of 64 500–73 500 cm−1 and their vibronic assignments (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 9167-9173 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using a monochromatic VUV beam generated by two-photon resonant sum frequency mixing in a Mg–Kr mixture, we have investigated the electronic transitions of ND3 in the 64 500–73 500 cm−1 region by detecting the fluorescence from the predissociation fragments of ND3 or by detecting the ions produced via VUV+visible resonance enhanced multiphoton ionization (REMPI). Vibronic transitions from the ground state to the 2n, n=7–12 levels of the B˜ 1E‘ state are rotationally resolved and the relevant molecular constants are deduced. Two parallel progressions are observed, of which one has been analyzed previously by Douglas [Faraday Discuss. Chem. Soc. 35, 158 (1963)]. We attribute the progression observed by Douglas as transitions to the 2n31 vibronic levels of the B˜ 1E‘ state, the other one as transitions to the 2n3141 vibronic levels of the same electronic state. Transitions to the υ2'=0 vibronic level of the previously assigned D˜ 1E‘ state have been rotationally resolved and the electronic symmetry of this electronic state is reassigned to E'. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468865
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  • 3
    Electronic Resource
    Electronic Resource
    The NaZn excimer: Blue–green band (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 4672-4679 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electronically excited NaZn excimers have been produced in a photochemical reaction of Na2(C 1Πu) with Zn(4 1S0). The Na–Zn vapor mixture was prepared by introducing a controlled stream of sodium vapor into zinc vapor generated in a heat-pipe oven. A new band (bound–free transition) was observed in the region from 450 to 487 nm. Potential curves of the eight lowest electronic states of NaZn were calculated. On the basis of the calculations, the observed emission is interpreted as resulting from the 2 2Π–X 2Σ+ transition. The conditions favorable for the observation of the photochemical reaction are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464971
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  • 4
    Electronic Resource
    Electronic Resource
    Study of the LiZn excimer: Blue–green bands (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7364-7371 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We performed a study of the LiZn excimer formed in the photochemical reaction of Li2(C 1Πu) with Zn(4 1S0). The Li2(C 1Πu) molecules were prepared by excitation with either a dye laser in the region from 348 to 377 nm or an excimer laser at 308 nm. We observed bound–free emission of LiZn at 477 nm. Nonrelativistic ab initio calculations of the potential energy curves and the relevant dipole transition moments have been performed. Using these results in spectral simulations the observed emission is interpreted as belonging to the 2 2Π–X 2Σ+ transition of the LiZn molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462439
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  • 5
    Electronic Resource
    Electronic Resource
    Deep Reactive Ion Etching of Lead Zirconate Titanate Using Sulfur Hexafluoride Gas (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A deep reactive ion etching (RIE) technique that uses sulfur hexafluoride (SF6) gas has been developed for lead zirconate titanate (Pb(Zr,Ti)O3, PZT) three-dimensional microfabrication from PZT ceramic blocks. The etching was performed by using an inductively coupled plasma that was generated in a narrow-gap vacuum chamber. The etch depth was 70 µm with a maximum etch rate of 0.3 µm/min and a selectivity of PZT to the electroplated nickel mask of 〉35:1. The sidewalls of the PZT structures were tapered, with base angles of ∼75°. Both positive RIE lag and unexpected ultrafine-slit etching phenomena were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01919.x
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  • 6
    Electronic Resource
    Electronic Resource
    Predissociation supported high-resolution vacuum ultraviolet absorption spectroscopy of excited electronic states of NH3 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 5523-5528 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using monochromatic vacuum ultraviolet radiation generated by two-photon resonant sum frequency mixing in a Mg–Kr mixture we have investigated the electronic transition of NH3 in the 67 000–73 000 cm−1 region by detecting the fluorescence from the predissociation fragments of NH3. The spectrum is simplified using a pulsed molecular beam. Vibronic bands of the B 1E‘ (29, 210, 211, 212, 2731, 2831) state are clearly identified and relevant molecular constants are deduced. The predissociation in the B˜ 1E‘ state is found to be nearly independent of the rotational quantum numbers (J,K) within one vibrational band. The linewidths of different vibronic components of the B˜ 1E‘ state are measured. In addition, other absorption bands are presented including previously unobserved weak absorption features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467341
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  • 7
    Electronic Resource
    Electronic Resource
    Quantum simulation of bound-free spectra (1992)
    Springer
    The European physical journal 23 (1992), S. 165-170 
    Details
    ISSN: 1434-6079
    Keywords: 33.40.-e ; 32.70.-n ; 34.20.Fi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have performed quantum simulations of the 23Π g −13Σ u + bound-free transition. Assuming Boltzmann and different non-Boltzmann distributions for the population in the 23Π g state, we have calculated the corresponding spectral shapes. The results show that the shape of the emission spectrum can be used to obtain information about the population distribution within rovibration levels of the upper state. Comparison with several experiments is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436740
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  • 8
    Electronic Resource
    Electronic Resource
    Spectral simulation and interpretation of LiZn and LiCd blue-green emission (1994)
    Springer
    The European physical journal 30 (1994), S. 39-44 
    Details
    ISSN: 1434-6079
    Keywords: 33.10. − n ; 33.20.Kf ; 33.80.Gj ; 34.50.Ez
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excited LiZn and LiCd molecules are produced in a photochemical reaction between Li2(C1Πu) molecules and zinc or cadmium atoms. Changes in shape of the blue-green emission are observed by increasing the total vapor pressure in the heat pipe oven. Quantum mechanical spectral simulations are carried out for the relevant 22Π →X 2Σ+ transitions. Both bound-bound and bound-free types of transitions are found to play an important role in the overall blue-green spectra. For high collision frequencies (high total vapor pressure) the simulated spectra show very good agreement with observations if a thermal distribution in the 22Π states is assumed. In this case bound-bound transitions are dominant. The results for low collision frequencies indicate that the nascent distribution is non-Boltzmann and that bound-free transitions are dominant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437477
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  • 9
    Electronic Resource
    Electronic Resource
    Observations and spectral simulations of the7Li2 21 Σ u + →X 1 Σ g + transition (1993)
    Springer
    The European physical journal 28 (1993), S. 135-140 
    Details
    ISSN: 1434-6079
    Keywords: 33.10 ; 33.20.—k ; 33.80.—k
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The7Li2 21 Σ u + →X 1 Σ g + electronic transition has a bound-bound and a bound-free part due to the double minimum nature of the upper 21 Σ u + state. We have studied this transition both experimentally and by performing spectral simulations. When inner well was excited the bound-free part at 4525 Å was observed due to the collisions between Li 2 * and argon. We found that when levels above the barrier are excited the bound-free emission is strongly affected by collisional relaxation of Li 2 * by Li atoms. Conditions for the observation of the bound-free part are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436980
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