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  • 1
    Electronic Resource
    Electronic Resource
    Subpicosecond predissociation dynamics of the methyl radical Rydberg 3 s state (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 270-276 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The subpicosecond dissociation dynamics of the methyl radical 3 s Rydberg state have been examined using rotational resonance Raman spectroscopy. The rovibronic dependence of the excited state predissociation rates and lifetimes are obtained for the B˜ state origin vibrational level of CH3 and CD3. Analysis of the tunneling rates using a cubic potential barrier yields estimates for the height (2200 cm−1) and position of the barrier along the dissociation coordinate (1.38 A(ring)). A comparison of the potential energy surface parameters for the Rydberg 3 s states of methyl radical and ammonia is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460394
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  • 2
    Electronic Resource
    Electronic Resource
    Examination of CD3 vibrational structure by resonance Raman spectroscopy (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 6977-6979 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The application of the resonance Raman spectroscopic method to the deuterated methyl radical is reported. Spectroscopic constants for CD3 are compared with previously reported values for CH3. The experimental and theoretical molecular physics of the methyl radical are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456273
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  • 3
    Electronic Resource
    Electronic Resource
    A force field analysis of the methyl radical X˜ 2A‘2 state stretching potential using the local mode—coupled Morse oscillator model (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 8793-8802 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The local mode-coupled Morse oscillator model was utilized to determine the quadratic, cubic, and quartic force constants for the vibrational stretching potential energy functions of the CH3, CD3, CH2D, and CHD2 using stretching fundamentals and overtones derived from resonance Raman studies. The Morse harmonic frequency and anharmonic constant of the methyl radical indicate that bonding in the methyl radical and a variety of ethylenic molecules is primarily a function of the sp2 hybridization of the central atom and that the bonding is not extensively influenced by the methyl radical's unpaired electron or the π bonding in the ethylenic molecules. The vibrational states of the methyl radical are best described by wave functions containing significant amounts of normal mode character. The stretching frequencies for the tritiated methyl radical isotopomers are calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461812
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  • 4
    Electronic Resource
    Electronic Resource
    Structure and dynamics of higher vibronic levels in the methyl radical Rydberg 3s state (1992)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 96 (1992), S. 3610-3615 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100188a012
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  • 5
    Electronic Resource
    Electronic Resource
    Ultraviolet Raman scattering from simple alcohols and a related diol as a study of low-lying Rydberg-valence state characteristics (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 6245-6252 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Relative Raman scattering cross sections of totally symmetric vibrational modes of liquid methanol, ethanol, and ethylene glycol are measured as a function of excitation wavelength in the preresonant spectral region 37 593–47 393 cm−1. Raman spectra are also obtained with 50 043 and 54 198 cm−1 excitation, the latter energy being directly resonant with the first excited state of the alcohols. The data indicate that the first three excited electronic states (with transition energies of approximately 54 600, 62 500, and 66 000 cm−1, respectively) make no significant contribution to the Raman scattered intensities and are nearly entirely Rydberg in character. The low-lying electronic structure of ethylene glycol appears to be primarily Rydberg in character as well. The dominant C–H and O–H stretching modes gain intensity largely from valence state(s) with transition energies near 70 000 cm−1, while the C–O stretching and CH2,3 bending modes gain intensity from even higher energy states (∼85 000 cm−1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465889
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  • 6
    Electronic Resource
    Electronic Resource
    Depth profiling of copper thin films by resonant laser ablation (1995)
    Springer
    Applied physics 61 (1995), S. 221-225 
    Details
    ISSN: 1432-0630
    Keywords: 78.65 ; 07.75 ; 81.60 ; 82.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In Resonant Laser Ablation (RLA), material is related and selectively ionized by a low-energy pulse from a tunable laser. The selectivity and efficiency allow detection and quantitation at very low concentrations. We demonstrate that RLA has potential use in profiling thin layer and multilayer structures. Quantitative results are reported on the analysis of 20 and 100 Å copper thin films on Si(110) surfaces. Removal rates range from 10−3 to 10−2 Å/shot. Prospects for interrogation of dopants and impurities are also evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538394
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  • 7
    Electronic Resource
    Electronic Resource
    Relationship of molecular structure and resin performance for a series of diglycidyl ethers (1962)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 6 (1962), S. 425-432 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: An investigation of the relationship between molecular structure and polymer performance has been made for a series of six diglycidyl ethers. The resins evaluated were those based on the bisphenols derived from methyl ethyl, methyl isobutyl, methyl n-amyl, methyl n-nonyl, methyl-n-heptadecyl and di-n-heptadecyl ketones. The first three members of this series gave performances close to those of the diglycidyl ether of p,p′-bisphenol acetone. The long chain members of the series showed poorer over-all performance but did exhibit significant hydrophobic character in the cured specimens. The cured diglycidyl ethers showed variation attributed to both length and configuration of the alkyl chain. An increase in length of straight chain resulted in lowered heat distortion temperature, hardness, shear strength, and organic solvent resistance. Branching in the alkyl chain imparts improved performance characteristics.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1962.070062206
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