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  • 1
    Electronic Resource
    Electronic Resource
    Final-State Effects in the Angle-Resolved Photoemission Extended Fine Structure of C(2.times.2)S/Ni(001) (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 9182-9186 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100088a016
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  • 2
    Electronic Resource
    Electronic Resource
    Alkylation of Cellulose with Esters of p-Toluenesulfonic Acid (1954)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 46 (1954), S. 1490-1493 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50535a050
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  • 3
    Electronic Resource
    Electronic Resource
    High resolution in the soft x-ray range from a toroidal grating monochromator (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2552-2557 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A resolving power, E/ΔE, of ≥13 000 has been achieved with the modified 6 m/160° toroidal grating monochromator (TGM) installed on Beam Line 8-1 at the Stanford Synchrotron Radiation Laboratory. The resolving power of the TGM was increased by replacing the entrance and exit slits with high-precision slits, masking the horizontal part (short radius) of the grating, and improving the TGM scanning mechanisms. To determine the performance of the monochromator, we measured the dependences of resolution and photon flux on the entrance- and exit-slit widths, the exit-slit position, and the masking of the grating. The monochromator resolution in the energy range of 25–65 eV was derived from photoionization measurements of extremely narrow core-excitation resonances in He and Ne. With 10-μm vertical entrance- and exit-slit widths and 32% mask opening of the grating, the monochromator has a resolution (full-width at half maximum) of 5.0±0.7 meV at a photon energy of 64.5 eV and a flux of 2×107 photons/s/100 mA. The results suggest a simple procedure for converting a TGM with moderate resolution into a high-resolution monochromator with a moderate reduction in photon flux due to masking the grating, beyond the reduction attributable to the slit widths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143866
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Some Compounds Containing the Trifluoromethyl Group (1946)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 68 (1946), S. 426-428 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01207a024
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular beam photoelectron spectroscopy of SO2: Geometry, spectroscopy, and dynamics of SO+2 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 2489-2497 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have reinvestigated the He i (584 A(ring)) photoelectron spectroscopy of SO2 using a supersonic molecular beam. High resolution and rotational cooling allowed us to observe new features and to resolve explicitly the vibrational structure in the first six electronic states of SO+2 ion. Improved spectroscopic constants for the ionic states and the adiabatic ionization potentials (IPs) are reported. The vibrational structure of the transition to the X˜ 2A1 ground state was assigned to the ν2 mode exclusively. Irregularity of the vibrational progression on the high IP side was observed, which indicated a potential barrier (to linearity) along the direction of Q2 coordinate. The barrier height was estimated to be 0.42 eV (3400 cm−1). Unusual vibrational structure in the A˜ 2A2 state was observed, due to the principal excitation of the ν3 mode and the presence of a potential barrier along the Q3 coordinate. The barrier height was estimated to be less than 220 cm−1. A new progression was resolved in the B˜ 2B2 state, which was assigned to be a combination of ν2 with 2ν3. The ν2 vibration was observed to be strongly coupled with the ν3 mode. The dynamics of the ion dissociations in the C˜, D˜, and E˜ states was discussed in connection with previous works. A satellite band at about 17.5 eV with resolved vibrational structure which consists of two ν1 vibrational progressions was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453088
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  • 6
    Electronic Resource
    Electronic Resource
    Molecular beam photoelectron spectroscopy: The C2D4+(X˜ 2B3) ground state (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 3216-3218 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The He i (584 A(ring)) photoelectron spectrum of C2D+4 in its ground electronic state has been measured, using a supersonic molecular beam. The combination of rotational cooling and improved resolution permits new vibrational fine structure to be observed and assigned. In particular, the ν3 value is accurately determined. A systematic increase in the ν4 torsional frequency with increasing excitation of the ν2 C=C stretching vibration is observed, indicating significant coupling between these modes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451979
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  • 7
    Electronic Resource
    Electronic Resource
    Molecular beam photoelectron spectroscopy and femtosecond intramolecular dynamics of H2O+ and D2O+ (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 6928-6939 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The 584 A(ring) photoelectron spectra of supersonic molecular beams of H2O and D2O have been obtained with improved resolution. The spectroscopic constants of the X˜ 2B1 and A˜ 2A1 state ions, including ω01, x011, ω02, x022, and x012, are reported. For the first two electronic states of the ion, precise line splittings were evaluated with a least squares fitting procedure, employing sums of empirical instrument response functions and a linear background. A simulation of the vibrational manifolds of the B˜ 2B2 state ions with combination progressions in the symmetry-allowed modes ν1 and ν2 failed to reproduce the diffuse photoelectron bands observed for both H2O and D2O. Autocorrelation functions were calculated from the photoelectron bands of all three electronic states. The B˜ 2B2 state correlation functions exhibit ultrafast decay, occurring on a 10−14 s time scale. The ν2 motion appears to define the decay in the correlation function. This behavior supports a previously proposed B˜ 2B2–A˜ 2A1 curve-crossing model for the nonradiative relaxation of the B˜ 2B2 state ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451379
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  • 8
    Electronic Resource
    Electronic Resource
    Electron energy loss spectroscopy (EELS) of CH3NH2 adsorbed on Ni(100), Ni(111), Cr(100), and Cr(111) (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 6001-6008 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Adsorbed CH3NH2 has been studied on Ni(100), Ni(111), Cr(100), and Cr(111) at 300 K using electron energy loss spectroscopy. The vibrational spectra indicate that molecular CH3NH2 exists on all four surfaces with bonding through the nitrogen lone pair, although a substantial amount of dissociation also occurs on the chromium surfaces. Approximately one monolayer of surface species is the stable coverage on each surface at 300 K. The possible existence of coadsorbed dissociation products CHx and NHx is discussed. The CN stretch is anomalously broad on Ni (100) and Ni(111) but not detectably broadened on Cr(100), indicating a strong sensitivity of this bond to interactions with the Ni surfaces. A multiplicity of sites is indicated on Cr(111) by the breadth of all the peaks. The loss spectra exhibit striking intensity differences, which can be attributed partly to impact scattering and partly to intrinsic differences in the interaction of CH3NH2 with the different surfaces. A model explaining the linewidth and intensity differences is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449634
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  • 9
    Electronic Resource
    Electronic Resource
    Reply to the "Comment on ‘The relationship between shape resonances and bond lengths' '' (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 3255-3256 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The relationship between shape−resonance energies and bond lengths within agiven molecule is explored further.It is contended that some shape−resonance assignments presented by Stohr and Hitchcock (ref.1) are not convincing.(AIP)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453017
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  • 10
    Electronic Resource
    Electronic Resource
    The relationship between shape resonances and bond lengths (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 2765-2771 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A discussion is presented on the general nature of shape resonances in small molecules and how they may relate to molecular bond lengths. Criteria for assigning photoabsorption features as shape resonances are described, and the usefulness of photoemission experiments to such assignments is highlighted. Based on these criteria, all unambiguously identified K-shell shape-resonance features in molecules containing B, C, N, O, and F are examined in an attempt to identify empirically a shape-resonance energy/bond length relationship. Although the available data are insufficient to establish a quantitative correlation, they indicate the influence of other variables besides the bond length to the energy position of a shape resonance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452078
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