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  • 1
    Electronic Resource
    Electronic Resource
    Study of Si4 and Si4− using threshold photodetachment (ZEKE) spectroscopy (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 3353-3362 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The threshold photodetachment (ZEKE) spectrum of Si4− is presented. Although no transitions to the ground state of Si4 are observed, we obtain detailed information on the anion and several of the low-lying excited states of neutral Si4. The spectrum shows a long progression of well-resolved transitions between the D2h 2B2g rhombus anion and ν2 vibrational levels of the first excited D2h 3B3u neutral. The length and spacing of the progression is consistent with ab initio calculations performed by Rohlfing and Raghavachari [J. Chem. Phys. 96, 2114 (1992)], but some of the sequence bands observed within the progression are not. We also observe transitions to the Si4 1B3u state which is found at a lower excitation energy than predicted. The perturbed vibrational structure in this band is attributed to vibronic coupling to a nearby electronic state which is "dark'' with respect to ZEKE spectroscopy. The ZEKE spectra are compared to the previously obtained photoelectron spectra of Si4− as well as ab initio calculations on Si4− and Si4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465145
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  • 2
    Electronic Resource
    Electronic Resource
    Reply to Comment on: Study of C−6 and C6 with threshold photodetachment spectroscopy and autodetachment spectroscopy (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 1442-1443 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This reply offers further support for the assignments of the vibrational frequencies of C6 made in our original paper [C. C. Arnold, Y. Zhao, T. N. Kitsopoulos, and D. M. Neumark, J. Chem. Phys. 97, 6121 (1992)]. Two of our experimental frequencies are quite different from the corresponding ab initio values, and the resolution of this discrepancy clearly requires further theoretical work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465340
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  • 3
    Electronic Resource
    Electronic Resource
    Reassignment of the Si−2 photodetachment spectra (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 766-768 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465757
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  • 4
    Electronic Resource
    Electronic Resource
    Negative Ion Zero Electron Kinetic Energy Spectroscopy of I-·CH3I (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 1633-1636 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100006a002
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  • 5
    Electronic Resource
    Electronic Resource
    Study of the ArBr−, ArI−, and KrI− anions and the corresponding neutral van der Waals complexes by anion zero electron kinetic energy spectroscopy (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 6538-6551 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Three rare gas halide (RgX−) anions, ArBr−, ArI−, and KrI−, and the corresponding open-shell van der Waals complexes, ArBr, ArI, and KrI, were studied with anion zero electron kinetic energy (ZEKE) spectroscopy. Photodetachment of each anion accesses the three lowest-lying electronic states (the X1/2, I3/2, and II1/2 states) of the neutral complex. The spectra for each system reveal well-resolved progressions in the low frequency vibrations of the anion and the three neutral electronic states, providing a detailed spectroscopic probe of the Rg⋅X− and Rg⋅X interaction potentials. The line shapes observed in the ZEKE spectra are analyzed in terms of the line strengths of the underlying rotational transitions. From our data, we construct the potential energy curve for each neutral state as well as for the anion, and these interaction potentials are compared to potentials obtained from scattering and ion mobility experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468500
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  • 6
    Electronic Resource
    Electronic Resource
    Anion photoelectron spectroscopy of small indium phosphide clusters (InxP−y; x,y=1–4) (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 5406-5409 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Small indium phosphide clusters having 2–8 atoms are studied using anion photoelectron spectroscopy of InxP−y (x,y=1–4). From these spectra, the electron affinities are determined. Both ground and low-lying excited electronic states of the neutral clusters are observed. An electronic gap is shown in the even cluster anion spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467393
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  • 7
    Electronic Resource
    Electronic Resource
    Study of the low-lying states of Ge2 and Ge−2 using negative ion zero electron kinetic energy spectroscopy (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 6982-6989 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The low-lying states of Ge2 and Ge−2 are probed using negative ion zero electron kinetic energy (ZEKE) spectroscopy. The ZEKE spectrum of Ge−2 yields an electron affinity of 2.035±0.001 eV for Ge2, as well as term energies and vibrational frequencies for the low-lying states of Ge−2 and Ge2. Specifically, we observe transitions originating from the anion 2Πu(3/2) ground state and 3Σ+g excited state (Te=279±10 cm−1) to several triplet and singlet states of Ge2. Term values and vibrational frequencies are determined for the Ge23Σ+g ground state, the low-lying 3Πu excited state (Te=337 cm−1 for the 2u spin–orbit component), and the somewhat higher lying 1Δg, 3Σ+g, and 1Πu states. We also determine the zero-field splitting for the X0+g and 1g components of the 3Σ+g state and the splittings between the 2u, 1u, and 0±u spin–orbit components of the 3Πu state. Detailed comparisons are made with Si2 and Si−2. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469091
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  • 8
    Electronic Resource
    Electronic Resource
    Threshold photodetachment zero-electron kinetic energy spectroscopy of Si−3 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 1797-1804 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The threshold photodetachment zero-electron kinetic energy (ZEKE) spectrum of Si−3 is presented and discussed. The spectrum shows well-resolved vibrational structure. A comparison with several ab initio calculations shows that the spectrum is due to transitions to the 3A'2 (D3h) state of Si3. The symmetric stretch and degenerate e' frequencies for the Si3 3A'2 state are determined to be 501±10 and 337±10 cm−1, respectively. Additional structure observed in the spectrum suggests that the negative ion is a fluxional, Jahn–Teller distorted species. The ZEKE spectrum shows no evidence for transitions to the 1A1 state of the neutral, which is predicted to lie very close to the 3A'2 state. A comparison of the ZEKE and previously obtained photoelectron spectrum of Si−3 suggests that these two states are close in energy, but that transitions to the singlet state are very weak in the ZEKE spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466532
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  • 9
    Electronic Resource
    Electronic Resource
    Photoelectron spectroscopy and zero electron kinetic energy spectroscopy of germanium cluster anions (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 2757-2764 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Anion photoelectron spectra of Ge−n, n=2–15, have been measured using an incident photon energy of 4.66 eV. In addition, the spectra of Ge−2, Ge−3, and Ge−4 have been measured at photon energies of 3.49 and 2.98 eV. From these spectra the electron affinity of the corresponding neutral cluster has been determined. Vibrational frequencies and term values for several electronic states of Ge−2 and Ge−3 have been determined. Vibrational structure in the 3B3u excited state of Ge4 has been resolved using zero electron kinetic energy (ZEKE) photoelectron spectroscopy. The assignment of the spectra of Ge−3 and Ge−4 is facilitated by a comparison to the similar spectra of Si−3 and Si−4, respectively. The spectra of the larger clusters, Ge−n, n=5–15, are characterized by many broad structureless features which indicate the presence of multiple electronic transitions. Several of these were assigned based on comparison with previous ab initio calculations on germanium and silicon clusters. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471098
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  • 10
    Electronic Resource
    Electronic Resource
    Study of C6− and C6 with threshold photodetachment spectroscopy and autodetachment spectroscopy (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 6121-6135 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The C6− anion and C6 neutral have been studied using both threshold photodetachment (zero electron kinetic energy) spectroscopy and autodetachment spectroscopy of C6−. The threshold photodetachment spectrum yields the electron affinity of linear C6 to high accuracy, along with the three symmetric stretch frequencies for linear C6 and the spin–orbit splitting in the ground 2Πu state of the anion. Two of the symmetric stretch frequencies are significantly lower than previous ab initio predictions. A simple model force field is used to calculate stretching force constants and estimate bond length changes between the anion and neutral. In addition, using autodetachment spectroscopy, we have located an excited electronic state of C6− that lies 43 cm−1 below the detachment threshold. This state is very similar in geometry to neutral C6. Excited vibrational levels of this state autodetach with rates that depend strongly on the available autodetachment channels. The excited state is tentatively assigned to a valence state, rather than an electrostatically bound state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463722
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