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  • 1
    Electronic Resource
    Electronic Resource
    Rotational excitation of OH in collisions with CO, N2, and CO2 (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 1302-1309 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Relative state-to-state cross sections are obtained for OH colliding with CO, N2, and CO2. Hexapole state selection is used to prepare a beam of OH molecules in the upper Λ-doublet component of the lowest rotational state. The collision induced rotational energy transfer is monitored state selectively by means of LIF (laser induced fluorescence) spectroscopy. A study is made of the symmetry effects in the obtained cross sections. The results are compared with previously reported cross sections for Ar, He, and H2. A general propensity is found for parity conserving transitions to the Π3/2, J=〈fraction SHAPE="CASE"〉52 and Π1/2, J=〈fraction SHAPE="CASE"〉12 states. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476680
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  • 2
    Electronic Resource
    Electronic Resource
    Relative predissociation rates of OH (A 2Σ+, v′=3) from combined cavity ring down—Laser-induced fluorescence measurements (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 2242-2248 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Relative predissociation rates of OH (A 2Σ+, v′=3) have been determined for N′ up to 17 by simultaneously measuring laser-induced fluorescence excitation and cavity ring down absorption in the same experimental setup. The results are in overall agreement with calculated predissociation rates by Yarkony [J. Chem. Phys. 97, 1838 (1992)], but show a stronger increase of the predissociation rate with increasing N. The obtained values for the quantum yield can be used in the application of the laser-induced predissociative fluorescence detection technique in combustion diagnostics. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474621
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  • 3
    Electronic Resource
    Electronic Resource
    Two-dimensional distributions of C2, CH, and OH in a diamond depositing oxyacetylene flame measured by laser induced fluorescence (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 2086-2096 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two-dimensional laser induced fluorescence measurements are applied to the chemical vapor deposition of diamond by an oxyacetylene flame. The fluorescence distributions of C2, CH, and OH are measured for various deposition conditions. The influence of the temperature of the molybdenum substrate and the distance between the substrate and the flame front on the two-dimensional distributions and on the quality and morphology of the deposited diamond is investigated. A relation is observed between the C2 distribution in the flame and the local growth rate and quality of the diamond layer, therefore C2 is thought to be an important species for diamond growth. The exact role of CH as a growth species is less clear; OH seems to be of minor importance. All measurements are performed during diamond deposition. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360186
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  • 4
    Electronic Resource
    Electronic Resource
    Erratum: Close coupling calculations on rotational excitation and inversion of NH3 by collisions with Ar [J. Chem. Phys. 97, 6460 (1992)] (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 5393-5395 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467287
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  • 5
    Electronic Resource
    Electronic Resource
    Relation between gas phase CN radical distributions, nitrogen incorporation, and growth rate in flame deposition of diamond (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 3708-3716 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Controlled amounts of nitrogen were added during oxyacetylene flame deposition of diamond to investigate the possible role of the CN radical in the effects of nitrogen addition. CN radical distributions were visualized using two-dimensional laser induced fluorescence (LIF) and compared with nitrogen incorporation into the layer and with the diamond growth rate, which were measured by means of cathodoluminescence (CL) and optical microscopy, respectively. For the studied range of nitrogen flows, it was found that the CN LIF signal in the center of the flame is linearly dependent on the added amount of nitrogen. Diamond deposition in the central region is mainly influenced by the deposition parameters, whereas deposition in the outer zone is largely determined by the interaction of the flame with the ambient; the annulus of enhanced growth is affected by both the deposition parameters and the ambient. By a simple consideration, in which the growth rate is separated in nitrogen dependent and independent contributions, an observed positional difference between CN LIF and growth rate maxima can be explained. Comparison of the CN LIF signal, the CL signal and the diamond deposition rate indicates that CN (or a closely related species) may be the species or one of the main species responsible for the effects of nitrogen addition during oxyacetylene flame deposition of diamond. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287409
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  • 6
    Electronic Resource
    Electronic Resource
    Cross sections for rotationally inelastic scattering of H2CO. I. Collisions with polar scattering gases (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1407-1419 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rotationally inelastic cross sections for ΔJ=0, ±1, and ±2 transitions in the K−1=1 ladder of formaldehyde (H2CO) in collision with CF3H, CH3F, and NH3 are measured in a beam-maser double-resonance (BMDR) experiment. The dependence on detection angle and relative collision velocity is investigated. At least 80% of the integral cross sections is probed. A striking difference in the angular dependence of the differential cross section for ΔJ=0 and ΔJ=±1 transitions is observed. The cross sections are compared with theoretical predictions in modified Anderson theory and adiabatically corrected sudden approximation. Anderson theory predicts very well the K-doublet cross sections and total inelastic cross sections, but fails to reproduce the state-to-state cross sections for ΔJ≠0 transitions. For ΔJ=±1 and ΔJ=±2 transitions corrected sudden approximation shows a much better agreement both with the cross sections determined in this investigation and with the values from other double-resonance experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452228
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  • 7
    Electronic Resource
    Electronic Resource
    Sensitive quantum state selective detection of H2O and D2O by (2+1)-resonance enhanced multiphoton ionization (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 6914-6922 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The first observation of (2+1)-REMPI of H2O and D2O is reported. With the use of a high power tunable excimer laser radiating at 248 nm, the H2O and D2O molecules are ionized after resonant two-photon absorption into the predissociated C˜ 1B1 state. The clearly observable peaks in the (2+1)-REMPI spectra are all identified and can be used for sensitive state selective detection. Parent molecular fluorescence excitation spectra (C˜ 1B1→A˜ 1B1) were remeasured over an increased spectral range, and are remarkably the same as the (2+1)-REMPI spectra. Furthermore the OH/OD (A 2Σ+, v'=0→X 2Π, v‘=0) photofragment fluorescence excitation spectra were measured, and these spectra do not show any nonresonant background as stated before. Additional fluorescence bands starting from the vibrationally excited A 2Σ+, v'=1 state were observed. Simulation of the observed REMPI and fluorescence excitation spectra yields the branching ratios for the predissociation, ionization, and fluorescence processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451845
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  • 8
    Electronic Resource
    Electronic Resource
    Cross sections for rotationally inelastic scattering of H2CO. II. Collisions with CO2, N2, O2, and H2 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 4461-4470 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Cross sections for ΔJ=0, ±1, and ±2 transitions in the K−1=1 ladder of formaldehyde (H2CO) in collision with CO2, N2, O2, and H2 are measured in a double-resonance beam maser. The dependence of the cross sections on detection angle, relative velocity, and H2 temperature is investigated. The experimental cross sections are confronted with calculations in modified Anderson theory and adiabatically corrected sudden approximation. For CO2 and N2 scattering dipole–quadrupole interaction dominates, a large fraction of the integral cross section is probed and agreement with theory is good. For O2 and H2 scattering also induction and dispersion forces are important; agreement with theory is less satisfactory indicating that the full potential, including the repulsive part, should be taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452720
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  • 9
    Electronic Resource
    Electronic Resource
    Hyperfine structure and lifetime of the C 2Σ+, v=0 state of CH (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 3032-3041 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: From a laser induced fluorescence (LIF) experiment on a molecular beam of CH, we have obtained the b and c hyperfine constants, the γ and γD spin-rotation constants as well as accurate values for the rotational constants B, D, and H for the C 2Σ+, v=0 state. From measurements of the linewidths, that are partially caused by predissociation, and by comparing relative line intensities, we determined different lifetimes for upper (F1) and lower (F2) ρ-doublet states of the C 2Σ+ state. For the F1 states we find a constant lifetime of 3.7±1.0 ns, that is independent of N, while for the F2 states we observed an increase in lifetime for higher N up to 8.0±1.5 ns for N=11.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450284
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  • 10
    Electronic Resource
    Electronic Resource
    Hyperfine structure and Λ doubling in the A 2Δ state of CH: Observation of an internal hyperfine perturbation (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 6575-6580 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the observation of a resonance between hyperfine states, due to the crossing of rotational ladders at N=10 of Δ5/2 and Δ3/2 spin-doublet states in the excited A 2Δ state of CH. Accurate values for the hyperfine constants a, b, and c in the A 2Δ state were obtained. From measurements of the Λ-doublet splittings we estimate an upper limit to the Λ doubling in the A 2Δ state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450710
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