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  • 1
    Electronic Resource
    Electronic Resource
    Observation of Rydberg transitions from the inner valence shell of ethane (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 1499-1501 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electron impact spectrum of ethane has been examined in a region that includes ionization out of the inner valence shell. One diffuse structure and a progression of ten vibrational bands have been found in a 4 eV range below and to some degree overlapping the 2A2u ion threshold. Evidence indicates that the observed transitions belong to the symmetry forbidden Rydberg series (2a2u)2→(2a2u, npσ or npπ).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453259
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  • 2
    Electronic Resource
    Electronic Resource
    Electron energy loss spectroscopy of disilane (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 4320-4323 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron energy loss spectra of disilane have been recorded over an excitation energy range of 20 eV employing electrons of 20 and 200 eV incident energy for scattering angles of 0°–90°. Every transition detected except one appears at an energy consistent with the first observed members of Rydberg series converging to one of four possible ion states. The first two observed transitions belong to (2a1g)2→1,3(2a1g,4s) dipole forbidden channels appearing at excitation energies of ∼6.3 and 7.05 eV for the triplet and singlet, respectively. Evidence is presented for the identification of additional forbidden transitions as well as possible low-lying valence transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453791
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  • 3
    Electronic Resource
    Electronic Resource
    Observation of the lowest triplet state in silane by electron energy loss spectroscopy (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 2115-2116 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electron energy loss spetra of silane was recorded at several impact energies and angles. It is concluded that the lowest triplet state of silane is formed from configuration mixing of the 4s Rydberg state with a valence state of the same symmetry.(AIP)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457996
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamics of electron impact dissociative excitation of XeF2: Production of XeF (B, v', N') (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 3596-3601 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: By using high-resolution electron beam techniques, we demonstrate that production of XeF(B) by electron impact dissociative excitation of XeF2 occurs via the XeF2 1Σ+u excited state. Furthermore, measurements of the fluorescence yield from the transitions XeF(B,v', N'→X, v‘, N‘) in the range 325–360 nm, combined with published Franck–Condon factors for these transitions, show that dissociative excitation of XeF2 produces XeF(B) that is vibrationally hot but rotationally cool. Relative vibrational populations of XeF(B, v', N') are derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454879
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  • 5
    Electronic Resource
    Electronic Resource
    Electron impact spectroscopy of silane and germanef a@f ) (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 2909-2917 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron impact spectra of silane and germane have been recorded using electrons of 200 eV incidence at scattering angles of ∼2°–9°. The range of energy losses covers the entire region of single electron excitation from the valence shell. In the bound state spectrum evidence is presented supporting the existence of two valence transitions in addition to anticipated s, p, and d Rydberg transitions. The 9° spectra reveal much structural detail in the ∼4 eV energy range preceding the 2A1 ion state. The most prominent band consists of a superposition of an optically allowed valence excitation and a symmetry forbidden Rydberg transition. The remaining peaks may be members of vibrational progressions belonging to either [d(t2), a1], [p, a1] ← (a1)2 dipole allowed or [d(e), a1], [s,a1] ← (a1)2 dipole forbidden channels. Of these two possibilities the evidence presented here favors the latter choice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448238
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  • 6
    Electronic Resource
    Electronic Resource
    Excitation of Rydberg states of HgCl2 and HgBr2 by electron impact (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 1883-1889 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have examined the electronic structure of HgCl2 and HgBr2 from 5 to 14 eV by high resolution electron energy loss spectroscopy. Our measurements include the near-UV region which has not been examined by any previous technique and which is found to be rich in Rydberg states. In particular, in each molecule we identify members of two optically allowed Rydberg series and one forbidden series with electronic structues σ2gσ2uπ4uπ3g [npπu, npσu, and ndπg, or (n+1)sσg] which converge to the 2∏g ground ionic state. In addition, other structures which form the dominant energy loss mechanisms in our spectra are identified as arising from optically allowed Rydberg states associated with the excited ionic states 2Πu, 2Σu, and 2Σg. Measurements at energy loss below 9 eV confirm previous valence states observed in photoabsorbtion and suggest the existence of two new valence states in each molecule. Angular measurements facilitate identification of many of the newly observed structures in our electron-energy loss spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448372
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  • 7
    Electronic Resource
    Electronic Resource
    A method for balancing the paths of a two-photon interferometer (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 23-26 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present and demonstrate a method for balancing the two paths of a two-photon interferometer of the Hong-Ou-Mandel (HOM) variety. This method removes the difficulties of balancing the paths in this type of interferometer where a type-I crystal is used for the generation of the entangled photon pairs. Using this method we show that we are consistently able to balance the ∼2000 mm path lengths in our HOM interferometer on average to within ∼60 μm. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150154
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  • 8
    Electronic Resource
    Electronic Resource
    Large dynamic range, parallel detection system for electron diffraction and imaging (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 2102-2105 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A parallel detection system for electrons in the 10–800-kV energy range is described. The design is based on a 576×382 pixel charge-coupled device array operating at liquid-nitrogen temperature. This is coupled by fiber optics to a single-crystal YAG screen, which serves as the primary detection element. The performance of the system for quantitative electron diffraction and imaging studies is described. The system will record a maximum count of 16 000 per pixel with low noise at a frame rate of 2.5 frames per second.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140039
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  • 9
    Electronic Resource
    Electronic Resource
    A laser-locked cavity ring-down spectrometer employing an analog detection scheme (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 347-353 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A system is described that employs a diode-pumped Nd:YAG continuous-wave laser source servolocked to a three-mirror optical cavity and an analog detection circuit that extracts the ring-down rate from the exponentially decaying ring-down waveform. This scheme improves on traditional cavity ring-down spectroscopy setups by increasing signal acquisition rates to tens of kilohertz and reducing measurement noise sources. For example, an absorption spectrum of a weak CO2 transition at 1064 nm is obtained in less than 10 s at a spectral resolution of 75 kHz employing a cavity with an empty-cavity ring-down decay lifetime of 2.8 μs and a total roundtrip path length of 42 cm. The analog detection system enables laser frequency scan rates greater than 500 MHz/s. The long-term sensitivity of this system is 8.8×10−12 cm−1 Hz−1/2 and the short-term sensitivity is 1.0×10−12 cm−1 Hz−1/2. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150206
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  • 10
    Electronic Resource
    Electronic Resource
    Photoexcitation of reaction complexes in the reaction K+NaCl→KCl+Na (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 844-855 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Emission at the Na D lines has been observed from the intersection of crossed molecular beams of K and NaCl irradiated by a cw dye laser at wavelengths from 590 and 735 nm. The three-beam signal exhibits a threshold near 735 nm and is linearly dependent on the laser and molecular beam intensities. This three-beam signal has been observed under experimental conditions in which all two-beam signals are accounted for, and is attributed to the formation of Na* by photoexcitation of the KNaCl reaction complex. The effective two-body cross section for the process is approximately 10−21 cm2 in a laser field of 1.5 kW/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451292
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