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  • 1
    Electronic Resource
    Electronic Resource
    Photoabsorption and direct dissociation cross sections of C2H2 in the 1530–1930 A(ring) region: A temperature dependent study (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 272-280 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using synchrotron radiation as a continuum light source, the absolute photoabsorption and direct dissociation cross sections of C2 H2 in the 1530–1930 A(ring) region have been measured at 295 and 155 K. In comparison with cross sections obtained at room temperature, the cross sections at absorption peaks typically increase by 10%–40% while those at absorption valleys decrease by as much as 30% at 155 K. Further, the absorption band profiles become narrower as the gas temperature decreases. In the presently studied wavelength region, there are at least three electronic states, namely, the A˜ 1 Au , the B˜ 1 Bu , and a continuum. Using the present low temperature data we have constructed the repulsive potential energy curve of the direct dissociation state according to the Franck–Condon principle. The potential energy curve thus constructed can be more accurate than that constructed by using room temperature cross section data because only the absorption cross section from the ν'=0 level contributes. The present cross section data have also been used in the analysis of oscillator strength distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457513
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  • 2
    Electronic Resource
    Electronic Resource
    Multichannel processes of H2O in the 18 eV region (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 6275-6282 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The various absolute partial cross sections for producing the excited neutral fragments, OH(A 2Σ+), H(n=2–4), and H2(a 3Σ+g), from photoexcitation of H2O in the 15–20.5 eV region are presented. It is found that a large fraction of the neutral products which amounts to 0.35 in the 15.7–17.7 eV region can be attributed to the undetected neutral products of (1) H(n=1)+OH(X 2Π), (2) H2(X 1Σ+g)+O(1D), and (3) H2(X 1Σ+g)+O(1S). All these products will possess high kinetic energy. The present results clearly show strong competitions among processes leading to photoionization and various photodissociation processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455392
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  • 3
    Electronic Resource
    Electronic Resource
    The excitation function of OH(A 2Σ+→X 2Π) fluorescence produced through photodissociation of H2O (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 498-499 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452590
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetic energy distribution of excited H atoms produced through dissociative photoionization excitation of H2 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1713-1717 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The kinetic energy distributions of excited hydrogen atoms produced in the dissociative photoionization excitation of H2 by He II 304 A(ring) photons have been obtained. A fluorescence photon–photoion coincidence technique has been utilized in the present study. A coincidence spectrum showing a broad peak with a weak shoulder corresponding to a time delay of 5.6–7.5 μs is obtained. The kinetic energy distribution of the peak is between 1.2 and 7.5 eV with a maximum at 4.2 eV indicating that this peak is attributable to the lowest energy dissociative photoionization excitation processes which correlate with H(2l)+H+. The relative partial cross sections for direct dissociative photoionization excitation through the 2pπu and 2sσg states at 304 A(ring) are determined to be 1: 0.25.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458053
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  • 5
    Electronic Resource
    Electronic Resource
    Photoabsorption cross section of acetylene in the EUV region (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 4495-4499 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using synchrotron radiation as a continuum background, the absolute total absorption cross section of C2H2 has been measured using a double ionization chamber. The cross sections range from 2.5 to a maximum of 35 Mb in the 175–740 A(ring) region. Two new Rydberg series have been identified and apparently converge to the B˜ 2Σ+u state of C2H+2 at 18.71 eV. The observed Rydberg states are tentatively assigned to (2σu)−1 nsσg 1Σ+u and (2σu)−1 ndσg 1Σ+u, respectively. The present cross section data have been used in the analysis of various sum rules including the TRK sum rule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448703
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  • 6
    Electronic Resource
    Electronic Resource
    Temperature-dependent absorption strengths for transitions from the ground state to the mutually perturbed A 1Π(v=1) and d 3Δ1(v=5) states of CO (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 267-273 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: High resolution photoabsorption cross section data for the CO 4PG (1,0) band have been obtained under several different temperature conditions. It was found that the absorption strength of the d 3Δ1–X 1Σ+ (5,0) band underlying the 4PG (1,0) band varies with temperature. The ratio of the absorption band strength of the d–X (5,0) band to that of the 4PG (1,0) band has been determined for temperatures at 150 K, 295 K, and 370 K. Adopting the integrated oscillator strength of the 4PG (1,0) from the recent literature we have determined band absorption cross sections for the two bands as a function of temperature. The ratios of the band absorption strengths of the A–X (1,0) and d–X (5,0) bands at different temperatures are compared with those calculated from the mixing coefficients determined by analysis of level shifts in high resolution spectra and lifetime measurements. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478102
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  • 7
    Electronic Resource
    Electronic Resource
    Photoabsorption and photoionization cross sections of gas phase GeH4 and Rydberg structures of GeH4 and SiH4 (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 1530-1536 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoabsorption and photoionization cross sections of GeH4 from the ionization threshold to 1060 A(ring) have been measured using synchrotron radiation as the continuum light source. The cross sections for the production of neutral products in the same spectral region have also been determined. Weak diffuse structures were observed in both the photoabsorption and photoionization spectra. The steplike ionization structures in the ionization spectrum were observed. The adiabatic ionization potential was determined to be at 1177.6±0.5 A(ring) which is in excellent agreement with a value recently reported by Ruscic et al. [J. Chem. Phys. 92, 1865 (1990)] using a photoionization mass spectrometry technique. Rydberg series in the 1060–1180 A(ring) region converging to the ground state of GeH4+ have been tentatively assigned. In addition, the assignments of Rydberg states of SiH4 reported in the literature have been re-examined in light of the recently reported ionization potential [Berkowitz et al., J. Chem. Phys. 86, 1235 (1987)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465321
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  • 8
    Electronic Resource
    Electronic Resource
    The production of CO+ (B 2Σ+) from dissociative photoionization excitation of CO2 (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 4720-4721 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450004
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  • 9
    Electronic Resource
    Electronic Resource
    First Solar EUV Irradiances Obtained from SOHO by the Celias/Sem (1998)
    Springer
    Solar physics 177 (1998), S. 161-173 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The first results obtained with the Solar EUV Monitor (SEM), part of the Charge, Element, and Isotope Analysis System (CELIAS) instrument, aboard the SOlar and Heliospheric Observatory (SOHO) satellite are presented. The instrument monitors the full-disk absolute value of the solar Heii irradiance at 30.4 nm, and the full-disk absolute solar irradiance integrated between 0.1 nm and 77 nm. The SEM was first turned on December 15, 1995 and obtained ‘first light’ on December 16, 1995. At this time the SOHO spacecraft was close to the L-1 Lagrange point, 1.5 × 106 km from the Earth towards the Sun. The data obtained by the SEM during the first four and a half months of operation will be presented. Although the period of observation is near solar minimum, the SEM data reveal strong short-term solar irradiance variations in the broad-band, central image channel, which includes solar X-ray emissions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004929011427
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  • 10
    Electronic Resource
    Electronic Resource
    Generation of coherent ultraviolet radiation in the 330 nm region by multiphoton excitation of sodium vapor (1984)
    Springer
    Applied physics 33 (1984), S. 155-160 
    Details
    ISSN: 1432-0649
    Keywords: 42.60 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the observation of coherent uv emission at 330.2±0.5 nm when sodium vapor in a heatpipe is irradiated with a pulsed visible dye laser with output wavelength in the 570–595 nm region. It is found that intense uv emission can be produced from Na atoms as well as from Na2 molecules. The excitation functions and their dependence on vapor density and laser power density are presented and the mechanisms for producing the emission are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688522
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